Radiative cooling of C₇⁻

K Najafian; M S Pettersson; B Dynefors; H Shiromaru; J Matsumoto; H Tanuma; T Furukawa; T Azuma; K Hansen

doi:10.1063/1.4867499

Radiative cooling of C₇⁻

J Chem Phys. 2014 Mar 14;140(10):104311. doi: 10.1063/1.4867499.

Authors

K Najafian¹, M S Pettersson¹, B Dynefors², H Shiromaru³, J Matsumoto³, H Tanuma⁴, T Furukawa⁴, T Azuma⁵, K Hansen¹

Affiliations

¹ Department of Physics, University of Gothenburg, 41296 Gothenburg, Sweden.
² Applied Physics, Chalmers Technical University, Gothenburg, Sweden.
³ Department of Chemistry, Tokyo Metropolitan University, 1-1 Minamiosawa, Hachiouji-shi, Tokyo 192-0397, Japan.
⁴ Department of Physics, Tokyo Metropolitan University, 1-1 Minamiosawa, Hachiouji-shi, Tokyo 192-0397, Japan.
⁵ Atomic, Molecular and Optical Physics Laboratory, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan.

PMID: 24628173
DOI: 10.1063/1.4867499

Abstract

The spontaneous and photo-induced neutralization of C₇⁻ produced in a laser ablation source was measured in an electrostatic storage ring. The measurements provide three independent determinations of the radiative cooling of the ions, based on the short time spontaneous decay and on the integrated amplitude and the shape of the photo-induced neutralization signal. The amplitude of the photo-induced signal was measured between 0.5 ms and 35 ms and found to depend on photon wavelength and ion storage time. All three signals can be reproduced with identical thermal IR radiative cooling rates with oscillator strengths equal to theoretical predictions. In addition, the measurements provide the excitation energy distribution.