TY - JOUR
T1 - Rotational effects in the band oscillator strengths and predissociation linewidths for the lowest 1Π u - X 1∑ + g transitions of N 2
AU - Haverd, V. E.
AU - Lewis, B. R.
AU - Gibson, S. T.
AU - Stark, G.
PY - 2005
Y1 - 2005
N2 - A coupled-channel Schrödinger equation (CSE) model of N2 photodissociation, which includes the effects of all interactions between the b, c, and o Πu1 and the C and C′ Πu3 states, is employed to study the effects of rotation on the lowest- ν Πu1 -X 1∑ g + (ν,0) band oscillator strengths and Πu1 predissociation linewidths. Significant rotational dependences are found which are in excellent agreement with recent experimental results, where comparisons are possible. New extreme-ultraviolet (EUV) photoabsorption spectra of the key b Πu1 ← X 1∑ g + (3,0) transition of N2 are also presented and analyzed, revealing a b (ν=3) predissociation linewidth peaking near J=11. This behavior can be reproduced only if the triplet structure of the C state is included explicitly in the CSE-model calculations, with a spin-orbit constant A≈15 cm-1 for the diffuse C (ν=9) level which accidentally predissociates b (ν=3). The complex rotational behavior of the b-X (3,0) and other bands may be an important component in the modeling of EUV transmission through nitrogen-rich planetary atmospheres.
AB - A coupled-channel Schrödinger equation (CSE) model of N2 photodissociation, which includes the effects of all interactions between the b, c, and o Πu1 and the C and C′ Πu3 states, is employed to study the effects of rotation on the lowest- ν Πu1 -X 1∑ g + (ν,0) band oscillator strengths and Πu1 predissociation linewidths. Significant rotational dependences are found which are in excellent agreement with recent experimental results, where comparisons are possible. New extreme-ultraviolet (EUV) photoabsorption spectra of the key b Πu1 ← X 1∑ g + (3,0) transition of N2 are also presented and analyzed, revealing a b (ν=3) predissociation linewidth peaking near J=11. This behavior can be reproduced only if the triplet structure of the C state is included explicitly in the CSE-model calculations, with a spin-orbit constant A≈15 cm-1 for the diffuse C (ν=9) level which accidentally predissociates b (ν=3). The complex rotational behavior of the b-X (3,0) and other bands may be an important component in the modeling of EUV transmission through nitrogen-rich planetary atmospheres.
UR - http://www.scopus.com/inward/record.url?scp=28944436931&partnerID=8YFLogxK
U2 - 10.1063/1.2134704
DO - 10.1063/1.2134704
M3 - Article
SN - 0021-9606
VL - 123
JO - Journal of Chemical Physics
JF - Journal of Chemical Physics
IS - 21
M1 - 214304
ER -