Eur. Phys. J. D (2016) 70: 240
https://doi.org/10.1140/epjd/e2016-70138-1

Regular Article

Study of the radiative electron attachment and photodetachment processes for the C₂H/C₂H^- and C₄H/C₄H^- molecules

¹ Department of Physics, University of Central Florida, Orlando, 32816 FL, USA
² Department of Physics and Astronomy, Drake University, Des Moines, 50311 Iowa, USA
³ Lawrence Berkeley National Laboratory, Chemical Sciences, Berkeley, 94720 CA, USA
⁴ Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, ENS Cachan, Université Paris-Saclay, Bât. 505, Campus d’Orsay, 91405 Orsay Cedex, France

^a e-mail: Viatcheslav.Kokoouline@ucf.edu

Received: 27 February 2016
Received in final form: 26 September 2016
Published online: 10 November 2016

Abstract

The photodetachment cross sections of the C₂H⁻ and C₄H⁻ molecular anions in their ground electronic and vibrational states are determined using the R-matrix approach. The obtained results are compared with available experimental data of absolute photodetachment cross sections. In addition, cross sections for the inverse process, i.e., radiative electron attachment, have also been determined and are used to obtain the corresponding thermally-averaged rate coefficients. At a temperature of 300 K, the rate coefficients are 2.3 × 10^-16 and 18 × 10^-16 cm³/s for C₂H⁻ and C₄H⁻, respectively.