We report a theoretical and experimental study of the high resolution resonant K(α) X-ray emission lines around the chlorine K-edge in gas phase 1,1-dichloroethylene. With the help of ab initio electronic structure calculations and cross section evaluation, we interpret the lowest lying peak in the X-ray absorption and emission spectra. The behavior of the K(α) emission lines with respect to frequency detuning highlights the existence of femtosecond nuclear dynamics on the dissociative Potential Energy Surface of the first K-shell core-excited state.
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http://dx.doi.org/10.1063/1.4897251 | DOI Listing |
Chem Pharm Bull (Tokyo)
May 2024
Faculty of Pharmaceutical Sciences, Toho University.
J Phys Chem Lett
March 2023
Fachbereich Physik, Philipps-Universität Marburg, Renthof 7, 35032 Marburg, Germany.
Halogenation of organic molecules causes chemical shifts of C1s core-level binding energies that are commonly used as fingerprints to identify chemical species. Here, we use synchrotron-based X-ray photoelectron spectroscopy and density functional theory calculations to unravel such chemical shifts by examining different partially fluorinated pentacene derivatives. Core-level shifts occur even for carbon atoms distant from the fluorination positions, yielding a continuous shift of about 1.
View Article and Find Full Text PDFJ Chem Theory Comput
October 2022
Department of Chemistry, Kyungpook National University, Daegu 41566, South Korea.
X-ray Transient Absorption Spectroscopy (XTAS) and theoretical calculations are used to study CCl prepared by 800 nm strong-field ionization. XTAS simultaneously probes atoms at the carbon K-edge (280-300 eV) and chlorine L-edge (195-220 eV). Comparison of experiment to X-ray spectra computed by orbital-optimized density functional theory (OO-DFT) indicates that after ionization, CCl undergoes symmetry breaking driven by Jahn-Teller distortion away from the initial tetrahedral structure (T) in 6 ± 2 fs.
View Article and Find Full Text PDFJ Phys Condens Matter
October 2022
Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom.
Chlorine covalently bonded to an open shell metal is present in many materials with desirable or intriguing physical properties. Materials include highly luminescent nontoxic alternatives to lead halide perovskites for optoelectronic applications KCuCland RbCuCl, enantiomorphic CsCuClthat presents magneto-chiral dichroism at a low temperature, and cubic KRuClthat possesses a singlet ground state generated by antiparallel spin and orbital angular momenta. Structural chirality of CsCuClhas been confirmed by resonant x-ray Bragg diffraction.
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