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Dissertations / Theses on the topic 'Interstellar molecules'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Whelan, Mark Clifford. "Spectroscopic studies of interstellar molecules." Thesis, University of Sussex, 2017. http://sro.sussex.ac.uk/id/eprint/68548/.

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2

Couch, Philip Anthony. "Molecules in circumstellar and interstellar environments : TiO." Thesis, University of Nottingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247564.

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3

Holland, Simon Michael. "Highly excited molecules and the interstellar maser." Thesis, University of Bristol, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265469.

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4

Harada, Nanase. "Interstellar Molecules in Galactic and Extragalactic Sources." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1312559226.

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5

Cernicharo, José. "Matiere diffuse et molecules interstellaires." Paris 7, 1988. http://www.theses.fr/1988PA077028.

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La structure des nuages sombres de la region taurus-auriga-perseus et les causes des differences chimiques observees sont etudiees a l'aide de donnees radio, ir et optique. Des observations millimetriques ont permis de realiser des cartes detaillees en co de ce complexe moleculaire interstellaire. De nouvelles molecules metalliques ont ete detectees (clna, clk, clal et fal) ainsi que des isotopes de sicc et hccch. Des travaux instrumentaux pour differents radiotelescopes sont aussi decrits

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6

Quan, Donghui. "Chemical Modeling of Interstellar Molecules in Dense Cores." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1259614944.

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7

Vichetti, Rafael Mário [UNESP]. "Síntese dos isótopos do monóxido de carbono no meio interestelar." Universidade Estadual Paulista (UNESP), 2009. http://hdl.handle.net/11449/91889.

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Made available in DSpace on 2014-06-11T19:25:31Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-12-21Bitstream added on 2014-06-13T19:53:20Z : No. of bitstreams: 1 vichietti_rm_me_rcla.pdf: 842604 bytes, checksum: 731ca276a75c1b92840e57bd7497b5e1 (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>De acordo com os resultados observacionais de condensações de nuvens moleculares escuras, grandes variações na razão 13CO/C18O são observadas quando se comparam os resultados obtidos nas condensações situadas dentro da mesma nuvem, bem como de nuvem para nuvem. O

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8

Smith, Arfon. "Dust and molecules in interstellar, circumstellar and extragalactic environments." Thesis, University of Nottingham, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.438422.

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9

Doronin, Mikhail. "Adsorption on interstellar analog surfaces : from atoms to organic molecules." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066254/document.

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Les interactions gaz-grains jouent un rôle important dans la chimie des milieux interstellaires et protoplanétaires. Le paramètre-clé qui gouverne les échanges entre la surface des grains et la phase gazeuse est l’énergie d’adsorption Ea. Ce travail a pour but de développer une approche jointe expérimentale et théorique afin de déterminer les énergies d’adsorption pour des atomes et molécules d’intérêt astrophysique sur des substrats-modèles des surfaces des grains de poussière interstellaires. Expérimentalement, la méthode employée est la désorption programmée en température (TPD). Le travail

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10

Hunt, Maria, University of Western Sydney, of Science Technology and Environment College, and School of Engineering and Industrial Design. "Molecules in southern molecular clouds: a millimetre-wave study of dense cores." THESIS_CSTE_EID_Hunt_M.xml, 2001. http://handle.uws.edu.au:8081/1959.7/116.

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This thesis presents an observational study of molecular abundances in the dense cores of 27 prominent molecular clouds in the southern galactic plane.The molecular abundances and physical conditions in dense condensations have been derived from millimetre-wavelength observations of molecular rotational transitions.The study has produced a comprehensive data set of transition intensities and abundances for 10 different molecules in bright southern molecular clouds, and the general characteristics of emissions from these molecules such as optical depth, excitation and relative abundances are di

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11

Hunt, Maria. "Molecules in southern molecular clouds: a millimetre-wave study of dense cores." Thesis, View thesis View thesis, 2001. http://handle.uws.edu.au:8081/1959.7/116.

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This thesis presents an observational study of molecular abundances in the dense cores of 27 prominent molecular clouds in the southern galactic plane.The molecular abundances and physical conditions in dense condensations have been derived from millimetre-wavelength observations of molecular rotational transitions.The study has produced a comprehensive data set of transition intensities and abundances for 10 different molecules in bright southern molecular clouds, and the general characteristics of emissions from these molecules such as optical depth, excitation and relative abundances are di

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12

Peppe, Salvatore. "Some unusual, astronomically significant organic molecules." Title page, contents and abstract only, 2002. http://web4.library.adelaide.edu.au/theses/09PH/09php4241.pdf.

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Appendix inside back cover. "June 2002" Bibliography: leaves 157-168. Experimental and theoretical studies were carried out on a number of unusual organic molecules of potential astronomical significance. The experimental work was corroborated by various theoretical approaches and by utilising computer-based quantum chemical calculations. Various covalently bound, anionic and neutral oxocarbon species were formed and studied. Additionally, two analogous heterocumulenic systems were investigated. Some isomers of either system, when energised, were shown to undergo gas-phase rearrangement proces

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13

Bolina, Amandeep Singh. "Adsorption of astrochemically relevant molecules on interstellar dust grain analogue surfaces." Thesis, University College London (University of London), 2005. http://discovery.ucl.ac.uk/1445324/.

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In the last few decades, astronomers have found that interstellar clouds are chemical factories, in which atoms are processed into more complex chemical species in reactions energized by starlight and fast particles. Many of the identified molecules are formed in networks of ion-molecule and neutral-neutral reactions and, at the low temperatures in the interstellar medium (-15 K), can accrete on the surface of interstellar dust grains to form ices. However, it is widely speculated that some of these interstellar ices can only form sufficiently rapidly if the more abundant atoms, and carbon mon

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14

Hunt, Maria. "Molecules in southern molecular clouds : a millimetre-wave study of dense cores /." View thesis View thesis, 2001. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20030416.160909/index.html.

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15

Marchione, Demian. "Thermal and non-thermal processes of simple molecules on model interstellar ices." Thesis, Heriot-Watt University, 2015. http://hdl.handle.net/10399/3010.

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Thin film growth and desorption behaviour of simple molecules have been studied by means of surface science techniques, such as mass spectrometry and reflectionabsorption infrared spectroscopy (RAIRS), in order to understand the physiochemical processes and intermolecular interactions in model interstellar ices. The systems of interest comprise a silica surface, representing the bare grains in the interstellar medium, and films of water (H2O), methanol (CH3OH), diethyl ether ((CH3CH2)2O) and benzene (C6H6). While H2O and CH3OH are key components of the icy mantles, (CH3CH2)2O and C6H6 are foun

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16

Vazart, Fanny. "Gas-phase formation of Complex Organic Models molecules in interstellar medium: computational investigations." Doctoral thesis, Scuola Normale Superiore, 2017. http://hdl.handle.net/11384/85813.

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[excerpt form the abstract:] In the field of astro- and prebiotic chemistry, the building blocks of life, which are molecules composed of more than 6 atoms, are called Complex Organic Molecules (COMs). Their appearances on the early inorganic Earth is therefore one of the major issues faced by researchers interested in the origin of life. In this thesis, split into three parts, the main purpose is to show how different COMs are formed in interstellar medium (ISM), using computational chemistry. The first part focuses mainly on preliminary studies aiming at evaluating the appropriate level of

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17

Godard, Amélie. "Collisional rate coefficients of sulfur-bearing molecules induced by light and heavy colliders for interstellar and cometary applications." Electronic Thesis or Diss., Université de Rennes (2023-....), 2024. http://www.theses.fr/2024URENS056.

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La connaissance des milieux astrophysiques provient principalement des spectres moléculaires capturés par les télescopes. Leur interprétation repose souvent sur les taux de collisions, qui font défaut pour de nombreuses molécules, limitant ainsi l’exploitation des observations. La chimie du soufre restant énigmatique, modéliser précisément les abondances des espèces soufrées peut apporter des pistes sur le problème du soufre manquant. Dans ce but, des taux de collisions pour CCS et ses isotopologues en collision avec He ont été calculés via une approche quantique, permettant de réviser leurs a

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18

Gatchell, Michael. "Molecular Hole Punching : Impulse Driven Reactions in Molecules and Molecular Clusters." Doctoral thesis, Stockholms universitet, Fysikum, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-129523.

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When molecules are excited by photons or energetic particles, they will cool through the emission of photons, electrons, or by fragmenting. Such processes are often thermal as they occur after the excitation energy has been redistributed across all degrees-of-freedom in the system. Collisions with atoms or ions may also lead to ultrafast fragmentation in Rutherford-like scattering processes, where one or several atoms can literally be knocked out of the molecule by the incoming projectile before the energy can be completely redistributed. The resulting fragmentation pathways can in such knocko

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19

Jacob, Arshia Maria [Verfasser]. "Small Molecules, Big Impact : Investigating Hydrides in the Interstellar Medium / Arshia Maria Jacob." Bonn : Universitäts- und Landesbibliothek Bonn, 2021. http://d-nb.info/1238687237/34.

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20

Vichetti, Rafael Mário. "Síntese dos isótopos do monóxido de carbono no meio interestelar /." Rio Claro : [s.n.], 2009. http://hdl.handle.net/11449/91889.

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Orientador: Carmen Maria Andreazza<br>Banca: Edson Denis Leonel<br>Banca: José Williams dos Santos Vilas Boas<br>Resumo: De acordo com os resultados observacionais de condensações de nuvens moleculares escuras, grandes variações na razão 13CO/C18O são observadas quando se comparam os resultados obtidos nas condensações situadas dentro da mesma nuvem, bem como de nuvem para nuvem. O valor médio dessa razão na condensação principal de Ophiuchus é inferior a 5. Por outro lado, o valor encontrado nas condensações que estão situadas ao norte de Oph é maior que 10. Grandes diferenças também são enco

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21

Harrison, S. "Electron-collisions with molecules of interstellar and plasma interest via the R-Matrix method." Thesis, University College London (University of London), 2012. http://discovery.ucl.ac.uk/1370630/.

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Here the ab-initio R-Matrix method has been used to carry out electron-molecule collision calculations on the the molecules of interstellar interest C3N, C2H & CN, and molecules found in industrial plasma applications SiBr, SiBr2 and NaI. These were carried out using the UK Molecular R-Matrix codes, along with the Quantemol expert system for running these codes. Calculations have also been carried out on electron collisions with atomic oxygen using these codes, with details included about the problems faced in running an atomic calculation with the molecular codes. Calculations on each species

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22

Skolimowska, Ewelina Szymanska. "Dissociative electron attachment and dipolar dissociation processes in organic molecules found in the interstellar medium." Thesis, Open University, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.606955.

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In this thesis, the results of a series of experimental studies of electron induced anion formation are presented for a number of molecular targets. The motivation of this work was the discovery of anions in interstellar space and in planetary atmospheres raising the question of how such species are formed. Molecular anions are commonly formed by electron impact via the Dissociative Electron Attachment (DEA) and Dipolar Dissociation (DD) with the simultaneous formation of neutral often reactive species (in case of DEA) and cationic fragments (in case of DD). These fragments may then undergo re

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23

El, Yajouri Meriem. "Diffuse Interstellar Bands (DIBs) : a new look at an old problem." Thesis, Paris Sciences et Lettres (ComUE), 2018. http://www.theses.fr/2018PSLEO017/document.

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Les bandes interstellaires diffuses (DIBs) représentent un mystère centenaire : aucune des centaines de bandes n'a pu être identifiée avec certitude avec un porteur spécifique, à l'exception très probable du cation buckminsterfullerène C60+. Il est obligatoire d'identifier et de quantifier la quantité de grosses molécules carbonées interstellaires qui sont très probablement responsables des DIBs : Les porteurs de DIB représentent probablement le plus grand réservoir de matière organique dans le Milieu interstellaire (MIS) et constituent un élément important de la chaîne des processus qui régis

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24

Kurdi, Louay. "Etude theorique des interactions intermoleculaires a grandes et moyennes distances dans le systeme de molecules interstellaires nh : :(3)+h::(2)." Université Louis Pasteur (Strasbourg) (1971-2008), 1987. http://www.theses.fr/1987STR13174.

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Etude des excitations rotationnelles de l'ammoniac nh::(3) lors de ses collisions avec la molecule h::(2) qui presentent un interet en astrophysique. Determination de la surface du potentiel d'interaction par calculs de type ab-initio

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25

Stantcheva, Tatiana. "Application of stochastic approaches to modeling of interstellar chemistry." Connect to this title online, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1085581872.

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Thesis (Ph. D.)--Ohio State University, 2004.<br>Title from first page of PDF file. Document formatted into pages; contains xii, 146 p.; also includes graphics (some col.) Includes bibliographical references (p. 141-146). Available online via OhioLINK's ETD Center

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26

Pouladsaz, Davoud. "From Interstellar Medium to Nanosurfaces: A Theoretical Study of Electronic Structure and Spectroscopic Properties of Molecules and Clusters." Doctoral thesis, Universitätsbibliothek Chemnitz, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-96529.

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This work tries to show the significant competence and functionality of density functional theory (DFT) and time-dependent density functional theory (TD-DFT) as theoretical approaches, supporting experimental measurements in various fields of physics from astrophysics to surface science, to study the electronic structure and spectroscopic properties of molecules and clusters: Silicon nanocrystals: Due to their optical properties, silicon nanocrystals have attracted considerable attention in astrophysics. In this work, the optical properties of H-passivated silicon nanocrystals are determined

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27

Pearcy, Adam C. "Non-covalent and covalent interactions between phenylacetylene and quinoline radical cations with polar and non-polar molecules in the gas phase." VCU Scholars Compass, 2019. https://scholarscompass.vcu.edu/etd/5990.

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Gas phase molecular clusters present an ideal medium for observing factors that drive chemical reactions without outside interferences from excessive solvent molecules. Introducing an ion into the cluster promotes ion-molecule interactions that may manifest in a variety of non-covalent or even covalent binding motifs and are of significant importance in many fields including atmospheric and astronomical sciences. For instance, in outer space, molecules are subject to ionizing radiation where ion-molecule reactions become increasingly competitive to molecule-molecule interactions. To elucidate

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28

Zhou, Luwenjia. "Probing the processes driving distant and local star-formation in galaxies through dust and molecules." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASP099.

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Les études sur l'évolution des galaxies ont été révolutionnées au cours des dernières décennies grâce aux nouveau télescopes et aux instruments de pointe. Les interféromètres Herschel, ALMA et NOEMA permettent d'observer l'émission des poussières tracant la formation des étoiles, invisible dans les bandes infrarouges proche observées par les télescopes optiques. Dans cette thèse, je me concentre sur la formation des étoiles aux grandes échelles des galaxies (~kpc). En utilisant les données des téléscopes Herschel, ALMA, NOEMA, et SAMI IFU, ma thèse tente de mettre en lumière les questions suiv

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29

Savić, Igor. "Formation of Small Hydrocarbon Ions Under Inter- and Circumstellar Conditions: Experiments in Ion Traps." Doctoral thesis, Universitätsbibliothek Chemnitz, 2004. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200401322.

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Using ion-trapping techniques, selected laboratory experiments on ion-molecule reactions of astrophysical interest have been performed. For the first time a carbon beam source has been integrated into an ion trapping machine for studying collisions between ions and neutral carbon atoms and molecules. Results are presented for the interaction of D3+ ions stored in a ring-electrode trap (RET), with a beam of hot neutral carbon molecules, Cn (n = 1, 2, 3). The measured reaction rate coefficients are up to a factor two smaller than values presently used in astrophysical models. In order to complet

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30

Fournier, Martin. "Reactivity of C₃N and C₂H at low temperature : applications for the Interstellar Medium and Titan." Thesis, Rennes 1, 2014. http://www.theses.fr/2014REN1S100/document.

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Le milieu interstellaire ainsi que certaines atmosphères de corps planétaires, en particulier Titan, un des plus grands satellites du système solaire, présentent une grande diversité d'espèces chimiques. Cette chimie complexe est très différente de celle que nous connaissons sur Terre. Pour comprendre les phénomènes globaux qui s'y déroulent, une connaissance des réactions chimiques, de leur vitesse et de leurs produits est requise. A l'aide de la technique CRESU, nous sommes capables de reproduire certaines conditions des milieux les plus froids de l'espace et d'étudier ces réactions<br>The i

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31

Chang, Qiang. "Continuous-time random-walk simulation of surface kinetics." The Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=osu1166592142.

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32

Jallat, Aurélie. "Fragmentation de molécules carbonées d'intérêt astrophysique auprès des accélérateurs." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112204.

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De nos jours environ 200 molécules ont été observées dans le milieu interstellaire, environ 75% d'entre elles sont carbonées et 25% sont des hydrocarbures. Les grains de poussières contiennent également du carbone en grande quantité. La présence du carbone dans la majorité des molécules et dans les grains de poussières s'explique par son abondance et sa capacité à former des liaisons. Il est donc crucial de les étudier d'un point de vue astrochimique. Dans une première partie, ce travail présente les mesures des rapports de branchement et des énergies dissipées sous forme d'énergie cinétique d

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33

Cernuto, Andrea. "Dissociative charge transfer of organic molecules induced by collisions with the He+ cation. A joint experimental and theoretical study of relevance for the interstellar medium evolution." Doctoral thesis, Università degli studi di Trento, 2017. https://hdl.handle.net/11572/368436.

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Collisions with He+ are an important pathway for the destruction of complex organic molecules in the interstellar medium (ISM). We have carried out dissociative charge transfer reactions of He+ with two oxygen containing organic molecules, ubiquitous in ISM: dimethyl ether (DME, CH3OCH3 ) and methyl formate (MF, HCOOCH3). Since they have a prebiotic relevance, several models were developed to explain how these molecules are formed and destroyed in the ISM. The reactions have been investigated by using the home-built Guided-Ion Beam Mass Spectrometer (GIB-MS) apparatus. Absolute cross sections

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34

Cernuto, Andrea. "Dissociative charge transfer of organic molecules induced by collisions with the He+ cation. A joint experimental and theoretical study of relevance for the interstellar medium evolution." Doctoral thesis, University of Trento, 2017. http://eprints-phd.biblio.unitn.it/2658/1/TESIdef_CERNUTO.pdf.

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Collisions with He+ are an important pathway for the destruction of complex organic molecules in the interstellar medium (ISM). We have carried out dissociative charge transfer reactions of He+ with two oxygen containing organic molecules, ubiquitous in ISM: dimethyl ether (DME, CH3OCH3 ) and methyl formate (MF, HCOOCH3). Since they have a prebiotic relevance, several models were developed to explain how these molecules are formed and destroyed in the ISM. The reactions have been investigated by using the home-built Guided-Ion Beam Mass Spectrometer (GIB-MS) apparatus. Absolute cross sections

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35

Pouladsaz, Davoud [Verfasser], Michael [Akademischer Betreuer] Schreiber, Michael [Gutachter] Schreiber, and Gotthard [Gutachter] Seifert. "From Interstellar Medium to Nanosurfaces: A Theoretical Study of Electronic Structure and Spectroscopic Properties of Molecules and Clusters / Davoud Pouladsaz ; Gutachter: Michael Schreiber, Gotthard Seifert ; Betreuer: Michael Schreiber." Chemnitz : Universitätsbibliothek Chemnitz, 2012. http://d-nb.info/121262713X/34.

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36

Edwards, Jessica Louise. "Chemistry in the Final Stages of Stellar Evolution: Millimeter and Submillimeter Observations of Supergiants and Planetary Nebulae." Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/565895.

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High mass loss rates in evolved stars make them the major contributors to recycling processed material back into the interstellar medium. This mass loss creates large circumstellar shells, rich in molecular material. This dissertation presents millimeter and submillimeter studies of the end stages of low mass and high mass stars in order to probe their molecular content in more detail. In low mass stars, the molecular material is carried on into the planetary nebula (PN) stage. Observations of CS, HCO⁺, and CO in planetary nebulae (PNe) of various post-asymptotic giant branch ages have shown t

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37

Ficut-Vicas, Dana. "Star formation in LITTLE THINGS dwarf galaxies." Thesis, University of Hertfordshire, 2015. http://hdl.handle.net/2299/17095.

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In this thesis we test and expand our current knowledge of Star Formation Laws (SF laws) in the extreme environment of dwarf irregular galaxies. We focus on the SF characteristics of our 18 galaxies sample, extending current investigations of the Schmidt-Kennicutt law to the low luminosity, low metallicity regime. The Hi data used in this project have been observed, calibrated and imaged according to the LITTLE THINGS Survey prescription to which I brought my own contribution as a member of the team. Apart from high resolution, VLA data in B, C and D array configurations, this project makes us

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38

Boissé, Patrick. "Systemes de raies d'absorption des quasars. Transfert de rayonnement dans un milieu inhomogene." Paris 7, 1987. http://www.theses.fr/1987PA077095.

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Premiere partie: evolution cosmologique des systemes civ. Etude statistique de la distribution en redshift. Donnees relatives aux raies fe ii et mg ii de systemes civ deja connus confirmant la presence de 2 phases distinctes: la premiere fortement ionisee de type "halo" et l'autre de type "disque". Pour deux cas etudies, on montre qu'une galaxie appartenant a l'amas contenant le quasar est responsable des raies d'absorptions. Deuxieme partie, travaux relatifs au milieu interstellaire. Transfert de rayonnement par les poussieres dans un milieu inhomogene

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39

Pacheco-Vazquez, Susana. "Unbiased Spectral Survey towards the intermediate-mass Class 0 protostar Cep E-mm." Thesis, Grenoble, 2012. http://www.theses.fr/2012GRENY066/document.

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Les protoétoiles de masse intermédiaire (IM) (2 ≤ M* ≤ 8 Msun) sont le lien entre les étoiles de faible et haute masse car elles couvrent également un intervalle intermédiaire de luminosités, de densités et de températures [Fuente et al., 2012]. Même si les « IM-YSOs » jouent un rôle important dans l'étude de la formation des étoiles, on a très peu de connaissances sur la formation et l'évolution des premières étapes des protoétoiles de masse intermédiaire. Les études systématiques spectrales sont un outil puissant pour caractériser la composition chimique d'un objet astrophysique, et la seule

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40

Favre, Cécile. "Étude interférométrique du formiate de méthyle et d’autres molécules complexes dans la nébuleuse d’Orion Kleinmann-Low." Thesis, Bordeaux 1, 2010. http://www.theses.fr/2010BOR14146/document.

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Un peu plus de 150 molécules ont été détectées dans le milieu interstellaire et circumstellaire. Parmi elles, nous dénombrons une soixantaine de molécules complexes composées d'au moins 6 atomes. La chimie du milieu interstellaire, synthétisant des molécules plus ou moins complexes à la surface des grains ou en phase gazeuse, est très différente de celle connue sur Terre. À ce jour, seules l'observation et l'analyse de l'émission des différentes espèces moléculaires permettent de contraindre les modèles de chimie interstellaire.Au cours de cette thèse, j'ai recherché des molécules complexes au

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41

Orkisz, Jan. "Understanding the structure of molecular clouds : multi-line wide-field imaging of Orion B." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAY045/document.

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La dernière génération de récepteurs radio, dotés à la fois d'une grande bande passante et d'une haute résolution, fait de toute observation radio-astronomique une étude spectroscopique. Dans le cas de l'imagerie à grand champ du milieu interstellaire, une telle abondance de données fournit de nouveaux outils de diagnostic, mais pose aussi de nouveaux défis en termes de traitement et d'analyse des données. L'objectif du projet ORION-B est d'observer 5 degrés carrés du nuage moléculaire OB, soit près de la moitité de la surface du nuage, dans toute la bande à 3mm. L'émission de dizaines de trac

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42

Letzelter, Corinne. "Spectroscopie et photodissociation de la molecule de co : applications astrophysiques." Paris 6, 1987. http://www.theses.fr/1987PA066182.

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Etude des spectres d'absorption et d'emission de la molecule de co et de ses isotopes dans le domaine 88. 5 nm-125 nm. Les sections efficaces d'absorption des bandes de co entre 88. 5 nm et 115 nm ont ete mesurees en utilisant le rayonnement synchrotron comme source lumineuse. La fluorescence a ete observee dans tout le domaine uv et visible et les rendements de flourescence ont ete determines. La section efficace de photodissociation corespondante est calculee en tenant compte d'un eventuel continuum de dissociation pour lequel une limite de la section efficace d'absorption a ete donnee. Pres

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Chehrouri, Mourad. "Analyse par spectroscopies des molécules formées par interaction d'atomes H,O et N sur des surfaces simulant les grains interstellaires et prédiction des voies de réaction." Thesis, Cergy-Pontoise, 2011. http://www.theses.fr/2011CERG0514/document.

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Le travail que je présente dans cette thèse est un travail principalement expérimental effectué au sein du laboratoire LAMAp de l'Université de Cergy-Pontoise, à l'aide du dispositif expérimental appelé FORMOLISM. Les principaux composants de ce dispositif sont: l'ultravide (10-10 mbar), l'ultra-froid (~5 K), des jets atomiques, la spectrométrie de masse TPD (Thermally Programmed Desorption) et la spectroscopie laser dans l'UV mettant en oeuvre des longueurs d'onde autour de ~200 nm. Grâce à la technique REMPI-TOF (Resonantly Enhanced Multi-Photon Ionization – Time Of Flight), nous avons étudi

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Boulanger, François. "Emission infrarouge du milieu interstellaire." Paris 6, 1987. http://www.theses.fr/1987PA066279.

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Une etude approfondie de l'emission ir du voisinage solaire montre comment les observations iras peuvent etre utilisees pour etudier la structure du milieu interstellaire local et permette une analyse microscopique de la question de l'origine de l'emission ir des galaxies. Presentation d'observations qui etablissent l'existence de petites particules dans l'ensemble du milieu interstellaire. Travaux observationnels sur le milieu interstellaire dans les galaxies proches m31 et ngc 6946. Etude de l'organisation a gande echelle du milieu interstellaire d'une galaxie spirale

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Valdivia, Valeska. "Impact of radiative transfer and chemistry on the formation of molecular clouds." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066709/document.

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Le milieu interstellaire (MIS) est un système extrêmement complexe. Il correspond à une échelle intermédiaire entre les étoiles et les galaxies. Le gaz interstellaire est présent dans toute la galaxie, remplissant l’espace entre les étoiles. Une grande diversité de processus couplés, comme la gravité, le champs magnétiques, la turbulence et la chimie, participe à son évolution, faisant de la modélisation du MIS un problème ardu. Une description correcte du MIS nécessite un bon traitement des équations de la magnetohydrodynamique (MHD), de la gravité, du bilan thermique et de

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Ouerfelli, Ghofrane. "Étude théorique de collisions d’intérêt interstellaire." Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0224/document.

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Le satellite Herschel Space Observatory a permit de détecter la lumière dans l'infrarouge lointain, ce qui correspond aux fréquences auxquelles émettent les molécules légères lors de leurs transitions rotationnelles. ALMA, un interféromètre situé sur un plateau du désert chilien a pris le relais d'Herschel et va permettre de nouvelles observations des nuages moléculaires froids avec une bonne précision angulaire. ALMA observe dans la gamme du millimétrique et du sub-millimétrique ce qui le rend complémentaire du satellite Herschel (infra lointain). Ces avancées considérables concernant les int

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Lee, Ho-Hsin. "Gas-phase chemical models of interstellar molecular clouds /." The Ohio State University, 1997. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487948440824473.

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Narayanan, Desika T. "The Molecular Interstellar Medium from z=0-6." Diss., The University of Arizona, 2007. http://hdl.handle.net/10150/194171.

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I investigate the emission properties of the molecular interstellar medium in protoplanetary disks and galaxy mergers, though focus largely on the latter topic. I utilize both numerical models as well as observations to relate the emission characteristics to physical models for the formation and evolution of gas giant planets and galaxies. The main results of this thesis follow. (1) Gas giant protoplanets may be detectable via self-absorption signatures in molecular emission lines with sufficiently high critical density. Given the spatial resolution of e.g. ALMA, gas giant planets in formation

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Le, Bourlot Jacques. "Calcul de probabilites de transition d'intercombinaison entre les etats x **(1)sigma ::(g)**(+) et a **(3)pi ::(v) de c::(2) carbone moleculaire : application a l'equilibre de c::(2) dans les nuages interstellaires diffus." Paris 7, 1987. http://www.theses.fr/1987PA077128.

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Boichat, Paul. "Spectroscopic studies of stellar, circumstellar, interstellar and cometary media." Thesis, University of Nottingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364672.

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