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Molecules 2018, 23(7), 1534; https://doi.org/10.3390/molecules23071534

Circular Dichroism in Fluorescence Emission Following the C 1s→π* Excitation and Resonant Auger Decay of Carbon Monoxide

1
Institute of Physics and CINSaT, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany
2
Rostov State Transport University, Narodnogo Opolcheniya Square 2, 344038 Rostov-on-Don, Russia
3
Research Institute of Physics, Southern Federal University, Stachki Avenue 194, 344090 Rostov-on-Don, Russia
Current Address: Chemical and Biological Physics Department, Weizmann Institute of Science, Herzl Street 234, 76100 Rehovot, Israel.
*
Author to whom correspondence should be addressed.
Academic Editor: Reiko Kuroda
Received: 29 May 2018 / Revised: 14 June 2018 / Accepted: 21 June 2018 / Published: 26 June 2018
(This article belongs to the Special Issue Recent Advances in Chiroptical Spectroscopy)
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Abstract

Dichroism in angle-resolved spectra of circularly polarized fluorescence from freely-rotating CO molecules was studied experimentally and theoretically. For this purpose, carbon monoxide in the gas phase was exposed to circularly polarized soft X-ray synchrotron radiation. The photon energy was tuned across the C 1s→π* resonant excitation, which decayed via the participator Auger transition into the CO+ A 2Π state. The dichroic parameter β1 of the subsequent CO+ (A 2Π → X 2Σ+) visible fluorescence was measured by photon-induced fluorescence spectroscopy. Present experimental results are explained with the ab initio electronic structure and dynamics calculations performed by the single center method. Our results confirm the possibility to perform partial wave analysis of the emitted photoelectrons in closed-shell molecules. View Full-Text
Keywords: excitation of molecules; fluorescence spectra; polarization analysis; circular dichroism; partial wave analysis excitation of molecules; fluorescence spectra; polarization analysis; circular dichroism; partial wave analysis
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Pitzer, M.; Schmidt, P.; Ozga, C.; Hans, A.; Reiß, P.; Petrov, I.D.; Artemyev, A.N.; Ehresmann, A.; Knie, A.; Demekhin, P.V. Circular Dichroism in Fluorescence Emission Following the C 1s→π* Excitation and Resonant Auger Decay of Carbon Monoxide. Molecules 2018, 23, 1534.

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