Coincident angle-resolved state-selective photoelectron spectroscopy of acetylene molecules:A candidate system for time-resolved dynamics
| Autor: | Hemkumar Srinivas, Alessandro D’Elia, Marcel Mudrich, Marcello Coreno, Ram Gopal, Sanket Sen, B. Bapat, Robert Richter, Arnab Sen, Sivarama Krishnan, Vandana Sharma, S. Mandal |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Physics
Photon Atomic Physics (physics.atom-ph) FOS: Physical sciences 02 engineering and technology Photoionization Photon energy 021001 nanoscience & nanotechnology Coupling (probability) 01 natural sciences Spectral line Physics - Atomic Physics X-ray photoelectron spectroscopy Excited state 0103 physical sciences Physics::Atomic and Molecular Clusters Physics - Atomic and Molecular Clusters Physical and Theoretical Chemistry Atomic physics 010306 general physics 0210 nano-technology Spectroscopy Atomic and Molecular Clusters (physics.atm-clus) |
| Zdroj: | Mandal, S, Gopal, R, Srinivas, H, D’Elia, A, Sen, A, Sen, S, Richter, R, Coreno, M, Bapat, B, Mudrich, M, Sharma, V & Krishnan, S 2021, ' Coincident angle-resolved state-selective photoelectron spectroscopy of acetylene molecules : A candidate system for time-resolved dynamics ', Faraday Discussions, vol. 228, pp. 242-265 . https://doi.org/10.1039/D0FD00120A |
| DOI: | 10.1039/D0FD00120A |
| Popis: | The acetylene-vinylidene system serves as a benchmark for investigations of ultrafast dynamical processes where the coupling of the electronic and nuclear degrees of freedom provides a fertile playground to explore the femto- and sub-femto-second physics with coherent extreme-ultraviolet (EUV) photon sources both on the table-top as well as free-electron lasers. We focus on detailed investigations of this molecular system in the photon energy range $19...40$ eV where EUV pulses can probe the dynamics effectively. We employ photoelectron-photoion coincidence (PEPICO) spectroscopy to uncover hitherto unrevealed aspects of this system. In this work, the role of excited states of the $C_{2}H_{2}^{+}$ cation, the primary photoion, is specifically addressed. From photoelectron energy spectra and angular distributions, the nature of the dissociation and isomerization channels is discerned. Exploiting the $4\pi$-collection geometry of velocity map imaging spectrometer, we not only probe pathways where the efficiency of photoionization is inherently high but also perform PEPICO spectroscopy on relatively weak channels. Comment: 12 pages, 7 figures, 5 tables |
| Databáze: | OpenAIRE |
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