Eur. Phys. J. D (2014) 68: 267
https://doi.org/10.1140/epjd/e2014-50400-4

Regular Article

Accurate treatment of total photoabsorption cross sections by an ab initio time-dependent method

Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia

^a e-mail: mnoh@um.edu.my

Received: 23 May 2014
Received in final form: 12 June 2014
Published online: 25 September 2014

Abstract

A detailed discussion of parallel and perpendicular transitions required for the photoabsorption of a molecule is presented within a time-dependent view. Total photoabsorption cross sections for the first two ultraviolet absorption bands of the N₂O molecule corresponding to transitions from the X¹A′ state to the 2¹A′ and 1¹A′′ states are calculated to test the reliability of the method. By fully considering the property of the electric field polarization vector of the incident light, the method treats the coupling of angular momentum and the parity differently for two kinds of transitions depending on the direction of the vector whether it is: (a) situated parallel in a molecular plane for an electronic transition between states with the same symmetry; (b) situated perpendicular to a molecular plane for an electronic transition between states with different symmetry. Through this, for those transitions, we are able to offer an insightful picture of the dynamics involved and to characterize some new aspects in the photoabsorption process of N₂O. Our calculations predicted that the parallel transition to the 2¹A′ state is the major dissociation pathway which is in qualitative agreement with the experimental observations. Most importantly, a significant improvement in the absolute value of the total cross section over previous theoretical results [R. Schinke, J. Chem. Phys. 134, 064313 (2011), M.N. Daud, G.G. Balint-Kurti, A. Brown, J. Chem. Phys. 122, 054305 (2005), S. Nanbu, M.S. Johnson, J. Phys. Chem. A 108, 8905 (2004)] was obtained.