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Electronic and vibrational radiative cooling of the small carbon clusters C4− and C6−

Journal article
Authors Naoko Kono
R. Suzuki
T. Furukawa
J. Matsumoto
H. Tanuma
H. Shiromaru
T. Azuma
Klavs Hansen
Published in Physical Review A. Atomic, Molecular, and Optical Physics
Volume 98
Issue 6
ISSN 1050-2947
Publication year 2018
Published at Department of Physics (GU)
Language en
Links https://doi.org/10.1103/PhysRevA.98...
Keywords clusters, radiation, storage ring, unimolecular decay
Subject categories Physical Sciences, Chemical Sciences

Abstract

Delayed electron detachment yields of C4− and C6− induced by photoexcitation in an electrostatic ion storage ring were measured as functions of excitation energies and laser firing times, allowing for a mapping of their radiative cooling in a wide energy range. The energy window concept and discrimination of one- and twophoton absorption are critical in understanding the obtained results. The experimentally obtained electronic and vibrational cooling rates were consistent with a simulation based on detailed-balance theory. The even-odd alternation of vibrational cooling rates, predicted from IR intensities, was also examined. We found that the larger anion cools faster, with no indication of an even-odd alternation.

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