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1

Feulner, P., F. Blobner, J. Bauer, et al. "Ways to Spin Resolved Core-Hole-Clock Measurements." e-Journal of Surface Science and Nanotechnology 13 (2015): 317–23. http://dx.doi.org/10.1380/ejssnt.2015.317.

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2

Garcia-Basabe, Yunier, Denis Ceolin, Aldo J. G. Zarbin, Lucimara S. Roman, and Maria Luiza M. Rocco. "Ultrafast interface charge transfer dynamics on P3HT/MWCNT nanocomposites probed by resonant Auger spectroscopy." RSC Advances 8, no. 46 (2018): 26416–22. http://dx.doi.org/10.1039/c8ra04629h.

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3

Cartwright, Elin, Fredrik O. L. Johansson, Tamara Sloboda, Birgit Kammlander, Andreas Lindblad, and Ute B. Cappel. "Ultrafast charge transfer dynamics in lead sulfide quantum dots probed with resonant Auger spectroscopy at the lead M-edge." RSC Advances 15, no. 21 (2025): 16894–900. https://doi.org/10.1039/d5ra00479a.

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4

Oropeza, Freddy E., Mariam Barawi, Elena Alfonso-González, et al. "Understanding ultrafast charge transfer processes in SnS and SnS2: using the core hole clock method to measure attosecond orbital-dependent electron delocalisation in semiconducting layered materials." Journal of Materials Chemistry C 9, no. 35 (2021): 11859–72. http://dx.doi.org/10.1039/d1tc02866a.

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5

Piancastelli, Maria Novella, Gildas Goldsztejn, Tatiana Marchenko, et al. "Core-hole-clock spectroscopies in the tender x-ray domain." Journal of Physics B: Atomic, Molecular and Optical Physics 47, no. 12 (2014): 124031. http://dx.doi.org/10.1088/0953-4075/47/12/124031.

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6

Wang, Li, Wei Chen, and Andrew Thye Shen Wee. "Charge transfer across the molecule/metal interface using the core hole clock technique." Surface Science Reports 63, no. 11 (2008): 465–86. http://dx.doi.org/10.1016/j.surfrep.2008.06.001.

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7

Zharnikov, Michael. "Probing charge transfer dynamics in self-assembled monolayers by core hole clock approach." Journal of Electron Spectroscopy and Related Phenomena 200 (April 2015): 160–73. http://dx.doi.org/10.1016/j.elspec.2015.05.022.

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8

Li, Yan, Xiaoyu Hao, Xiongbai Cao, et al. "Ultra-Fast Charge Transfer in P3HT Composites Using the Core Hole Clock Technique." Nanomaterials 15, no. 6 (2025): 433. https://doi.org/10.3390/nano15060433.

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Charge transfer dynamics fundamentally influence energy conversion efficiency in excited electronic states, directly impacting photoelectric conversion, molecular electronics, and catalysis. The core hole clock (CHC) technique enables the precise measurement of interfacial charge transfer time, providing insights into the electronic structure and dynamics of organic and inorganic coupled systems. Among these materials, poly(3-hexylthiophene) (P3HT), a p-type semiconductor known for its high charge mobility, serves as an ideal model for charge transfer studies. This review discusses recent adva
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9

VILLAR-GARCIA, IGNACIO J. "Understanding ultrafast charge transfer processes in SnS and SnS2: using the core hole clock method to measure attosecond orbital-dependent electron delocalisation in semiconducting layered materials." Journal of Materials Chemistry C 9 (February 8, 2024): 11859–72. https://doi.org/10.5281/zenodo.10636614.

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SnS and SnS<sub>2</sub>&nbsp;are earth abundant layered semiconductors that owing to their optoelectronic properties have been proposed as materials for different photovoltaic, photosensing and photocatalytic applications. The intrinsic efficiency of these materials for such applications is driven by their charge transfer dynamics, which in turn depend on their electronic structure and the interaction of the molecular orbitals involved in the charge transfer process. In this publication, we provide a step-by-step description of the use of the core hole clock method to obtain orbital dependent
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10

Sundermann, T., N. Müller, U. Heinzmann, et al. "A universal approach to spin selective core-hole-clock measurement demonstrated for Ar/Co(0001)." Surface Science 643 (January 2016): 190–96. http://dx.doi.org/10.1016/j.susc.2015.08.031.

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11

Borges, B. G. A. L., L. S. Roman, and M. L. M. Rocco. "Femtosecond and Attosecond Electron Transfer Dynamics of Semiconductors Probed by the Core-Hole Clock Spectroscopy." Topics in Catalysis 62, no. 12-16 (2019): 1004–10. http://dx.doi.org/10.1007/s11244-019-01189-8.

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12

Cao, Liang, Xing-Yu Gao, Andrew T. S. Wee, and Dong-Chen Qi. "Quantitative Femtosecond Charge Transfer Dynamics at Organic/Electrode Interfaces Studied by Core-Hole Clock Spectroscopy." Advanced Materials 26, no. 46 (2014): 7880–88. http://dx.doi.org/10.1002/adma.201305414.

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13

Li, Siqi, Taran Driver, Philipp Rosenberger, et al. "Attosecond coherent electron motion in Auger-Meitner decay." Science 375, no. 6578 (2022): 285–90. http://dx.doi.org/10.1126/science.abj2096.

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In quantum systems, coherent superpositions of electronic states evolve on ultrafast time scales (few femtoseconds to attoseconds; 1 attosecond = 0.001 femtoseconds = 10 −18 seconds), leading to a time-dependent charge density. Here we performed time-resolved measurements using attosecond soft x-ray pulses produced by a free-electron laser, to track the evolution of a coherent core-hole excitation in nitric oxide. Using an additional circularly polarized infrared laser pulse, we created a clock to time-resolve the electron dynamics and demonstrated control of the coherent electron motion by tu
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14

Garcia-Basabe, Yunier, Alexandre R. Rocha, Flávio C. Vicentin, et al. "Ultrafast charge transfer dynamics pathways in two-dimensional MoS2–graphene heterostructures: a core-hole clock approach." Physical Chemistry Chemical Physics 19, no. 44 (2017): 29954–62. http://dx.doi.org/10.1039/c7cp06283d.

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15

Cao, Liang, Ming Yang, Li Yuan, et al. "Orbital dependent ultrafast charge transfer dynamics of ferrocenyl-functionalized SAMs on gold studied by core-hole clock spectroscopy." Journal of Physics: Condensed Matter 28, no. 9 (2016): 094006. http://dx.doi.org/10.1088/0953-8984/28/9/094006.

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16

Pokapanich, Wandared, Nikolai V. Kryzhevoi, Niklas Ottosson, et al. "Ionic-Charge Dependence of the Intermolecular Coulombic Decay Time Scale for Aqueous Ions Probed by the Core-Hole Clock." Journal of the American Chemical Society 133, no. 34 (2011): 13430–36. http://dx.doi.org/10.1021/ja203430s.

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17

Friedlein, R., S. Braun, M. P. de Jong, W. Osikowicz, M. Fahlman, and W. R. Salaneck. "Ultra-fast charge transfer in organic electronic materials and at hybrid interfaces studied using the core-hole clock technique." Journal of Electron Spectroscopy and Related Phenomena 183, no. 1-3 (2011): 101–6. http://dx.doi.org/10.1016/j.elspec.2010.11.001.

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18

KONDOH, Hiroshi, Yuki HIGASHI, Masaaki YOSHIDA, et al. "Structure and Photo-Induced Charge Transfer of Pyridine Molecules Adsorbed on TiO2(110): A NEXAFS and Core-Hole-Clock Study." Electrochemistry 82, no. 5 (2014): 341–45. http://dx.doi.org/10.5796/electrochemistry.82.341.

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19

Garcia-Basabe, Yunier, Gustavo G. Parra, Marina B. Barioni, Cesar D. Mendoza, Flavio C. Vicentin, and Dunieskys G. Larrudé. "Species selective charge transfer dynamics in a P3HT/MoS2 van der Waals heterojunction: fluorescence lifetime microscopy and core hole clock spectroscopy approaches." Physical Chemistry Chemical Physics 21, no. 42 (2019): 23521–32. http://dx.doi.org/10.1039/c9cp04431k.

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20

Föhlisch, A., S. Vijayalakshmi, F. Hennies, W. Wurth, V. R. R. Medicherla, and W. Drube. "Verification of the core-hole-clock method using two different time references: Attosecond charge transfer in c(4×2)S/Ru(0001)." Chemical Physics Letters 434, no. 4-6 (2007): 214–17. http://dx.doi.org/10.1016/j.cplett.2006.12.001.

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21

Wouk, Luana, Soheila Holakoei, Leandro Benatto, et al. "Morphology and energy transfer study between conjugated polymers thin films: experimental and theoretical approaches." Journal of Physics: Condensed Matter 34, no. 21 (2022): 214010. http://dx.doi.org/10.1088/1361-648x/ac4c12.

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Abstract In this paper, the effect of a silafluorene derivative copolymer, the poly[2,7-(9,9-dioctyl-dibenzosilole)-alt-4,7-bis(thiophene-2-yl)benzo-2,1,3-thiadiazole] (PSiF-DBT) sensitized by a simpler homopolymer, the poly[2-methoxy-5-(3′,7′-dimethyloctyloxy)-1,4-phenylenevinylene] (MDMO-PPV) were investigated in a bilayer and ternary blend configuration. The energy transfer between the polymers prior to electron transfer to the acceptors can be an efficient alternative to photocurrent improvement in photovoltaic devices. The interactions between the two donor polymer films were evaluated op
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22

Fang, L., M. Hoener, O. Gessner, et al. "Double Core-Hole Production inN2: Beating the Auger Clock." Physical Review Letters 105, no. 8 (2010). http://dx.doi.org/10.1103/physrevlett.105.083005.

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23

Cao, Liang, Ziyu Zhang, Damien Thompson, Dong-Chen Qi, and Christian Albertus Nijhuis. "Resolving Charge Transfer Mechanisms in Molecular Tunnel Junctions using Dynamic Charge Transfer and Static Current-Voltage Measurements." Journal of Materials Chemistry C, 2024. http://dx.doi.org/10.1039/d3tc04184k.

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Understanding charge transfer (CT) dynamics is important for controlling the tunneling mechanism of molecular devices consisting of molecular junctions. Synchrotron-based core-hole clock (CHC) spectroscopy can quantify the femtosecond-scale CT time...
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24

Villar, García Ignacio José. "Understanding ultrafast charge transfer processes in SnS and SnS2: using the core hole clock method to measure attosecond orbital-dependent electron delocalisation in semiconducting layered materials." February 8, 2024. https://doi.org/10.5281/zenodo.10634000.

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SnS and SnS<sub>2</sub>&nbsp;are earth abundant layered semiconductors that owing to their optoelectronic properties have been proposed as materials for different photovoltaic, photosensing and photocatalytic applications. The intrinsic efficiency of these materials for such applications is driven by their charge transfer dynamics, which in turn depend on their electronic structure and the interaction of the molecular orbitals involved in the charge transfer process. In this publication, we provide a step-by-step description of the use of the core hole clock method to obtain orbital dependent
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25

Velasquez, Nicolas, Fernanda B. Nunes, Oksana Travnikova, et al. "X-ray induced ultrafast charge transfer in thiophene-based conjugated polymers controlled by core-hole clock spectroscopy." Physical Chemistry Chemical Physics, 2024. http://dx.doi.org/10.1039/d3cp04303g.

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Ultrafast charge transfer along the polymer chains is triggered by a selective resonant core-excitation of the sulfur atom in P3HT films and powders. Our approach opens perspectives for studies on intra-molecular conductivity in organic molecules.
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26

Muchová, E., G. Gopakumar, I. Unger, et al. "Attosecond formation of charge-transfer-to-solvent states of aqueous ions probed using the core-hole-clock technique." Nature Communications 15, no. 1 (2024). http://dx.doi.org/10.1038/s41467-024-52740-5.

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AbstractCharge transfer between molecules lies at the heart of many chemical processes. Here, we focus on the ultrafast electron dynamics associated with the formation of charge-transfer-to-solvent (CTTS) states following X-ray absorption in aqueous solutions of Na+, Mg2+, and Al3+ ions. To explore the formation of such states in the aqueous phase, liquid-jet photoemission spectroscopy is employed. Using the core-hole-clock method, based on Auger–Meitner (AM) decay upon 1s excitation or ionization of the respective ions, upper limits are estimated for the metal-atom electron delocalization tim
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27

Chen, Zhesheng, Heqi Xiong, Hao Zhang, et al. "Ultrafast electron energy-dependent delocalization dynamics in germanium selenide." Communications Physics 4, no. 1 (2021). http://dx.doi.org/10.1038/s42005-021-00635-y.

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AbstractUltrafast scattering process of high-energy carriers plays a key role in the performance of electronics and optoelectronics, and have been studied in several semiconductors. Core-hole clock spectroscopy is a unique technique for providing ultrafast charge transfer information with sub-femtosecond timescale. Here we demonstrate that germanium selenide (GeSe) semiconductor exhibits electronic states-dependent charge delocalization time by resonant photo exciting the core electrons to different final states using hard-x-ray photoemission spectroscopy. Thanks to the experiment geometry and
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28

Fields, Connor, Aleksandra Foerster, Sadegh Ghaderzadeh, et al. "Timing the escape of a photoexcited electron from a molecular cage." Nature Communications 16, no. 1 (2025). https://doi.org/10.1038/s41467-025-60260-z.

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Abstract Charge transfer is fundamentally dependent on the overlap of the orbitals comprising the transport pathway. This has key implications for molecular, nanoscale, and quantum technologies, for which delocalization (and decoherence) rates are essential figures of merit. Here, we apply the core hole clock technique—an energy-domain variant of ultrafast spectroscopy—to probe the delocalization of a photoexcited electron inside a closed molecular cage, namely the Ar 2p 54s 1 state of Ar@C60. Despite marginal frontier orbital mixing in the ground configuration, almost 80% of the excited state
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29

Villar, García Ignacio José. "Fundamental Insights into Photoelectrocatalytic Hydrogen Production with a Hole-Transport Bismuth Metal–Organic Framework." February 8, 2024. https://doi.org/10.5281/zenodo.10634221.

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Solar fuels production is a cornerstone in the development of emerging sustainable energy conversion and storage technologies. Light-induced H<sub>2</sub>&nbsp;production from water represents one of the most crucial challenges to produce renewable fuel. Metal&ndash;organic frameworks (MOFs) are being investigated in this process, due to the ability to assemble new structures with the use of suitable photoactive building blocks. However, the identification of the reaction intermediates remains elusive, having negative impacts in the design of more efficient materials. Here, we report the synth
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30

Berggren, Elin, Yi-Chen Weng, Qifan Li, et al. "Charge Transfer in the P(g42T-T):BBL Organic Polymer Heterojunction Measured with Core-Hole Clock Spectroscopy." Journal of Physical Chemistry C, December 5, 2023. http://dx.doi.org/10.1021/acs.jpcc.3c05665.

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31

Lee, J. D. "Model for the Attosecond Resonant Photoemission of Copper Dichloride: Evidence for High-Order Fano Resonances and a Time-Domain Core-Hole Clock." Physical Review Letters 111, no. 2 (2013). http://dx.doi.org/10.1103/physrevlett.111.027401.

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32

Inzani, Giacomo, and Matteo Lucchini. "Attosecond electron dynamics in solid-state systems." Journal of Physics: Photonics, February 2, 2025. https://doi.org/10.1088/2515-7647/adb13c.

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Abstract Attosecond science has revolutionized the study of ultrafast electron dynamics. Originally based on high-order harmonic generation from intense laser fields, it provided groundbreaking insights into physical processes occurring on the few- to sub-femtosecond time scales. From its initial focus on atomic and molecular systems, the field rapidly expanded to solid-state materials, uncovering phenomena with possible significant implications for information technology. This review focuses on some of the key experimental techniques that enable attosecond resolution in solid-state systems. W
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33

Haverkamp, Robert, Nomi L. A. N. Sorgenfrei, Erika Giangrisostomi, Stefan Neppl, Danilo Kühn, and Alexander Föhlisch. "Directional charge delocalization dynamics in semiconducting 2H-MoS$$_{2}$$ and metallic 1T-Li$$_{\mathrm{x}}$$MoS$$_{2}$$." Scientific Reports 11, no. 1 (2021). http://dx.doi.org/10.1038/s41598-021-86364-2.

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AbstractThe layered dichalcogenide MoS$$_{2}$$ 2 is relevant for electrochemical Li adsorption/intercalation, in the course of which the material undergoes a concomitant structural phase transition from semiconducting 2H-MoS$$_{2}$$ 2 to metallic 1T-Li$$_{\mathrm{x}}$$ x MoS$$_{2}$$ 2 . With the core hole clock approach at the S L$$_{1}$$ 1 X-ray absorption edge we quantify the ultrafast directional charge transfer of excited S3p electrons in-plane ($$\parallel$$ ‖ ) and out-of-plane ($$\perp$$ ⊥ ) for 2H-MoS$$_{2}$$ 2 as $$\tau _{2H,\parallel } = 0.38 \pm 0.08$$ τ 2 H , ‖ = 0.38 ± 0.08 fs and
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34

Garcia-Basabe, Yunier, Matheus Suenson Cardoso, Flavio C. Vicentin, et al. "Attosecond Electron Delocalization Dynamics in Thin Films Thiophene-Based Semiconductor Polymers: A Core Hole Clock Approach from Sulfur L1L2,3M1,2,3 Coster–Kronig Autoionization Spectra." Journal of Physical Chemistry C, April 8, 2024. http://dx.doi.org/10.1021/acs.jpcc.3c08353.

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