DOUBLY-EXCITED 1(3)SIGMA(-)(G) STATE OF NA2 - OBSERVATION AND CALCULATION

Citation
Ym. Liu et al., DOUBLY-EXCITED 1(3)SIGMA(-)(G) STATE OF NA2 - OBSERVATION AND CALCULATION, The Journal of chemical physics, 103(17), 1995, pp. 7213-7217
Citations number
37
Categorie Soggetti
Physics, Atomic, Molecular & Chemical
ISSN journal
00219606
Volume
103
Issue
17
Year of publication
1995
Pages
7213 - 7217
Database
ISI
SICI code
0021-9606(1995)103:17<7213:D1SON->2.0.ZU;2-0
Abstract
The upsilon=0-57 levels of the 3p + 3p doubly excited 1 3 Sigma(g)(-) State of Na-2 have been observed by pulsed perturbation facilitated op tical-optical double resonance (PFOODR) fluorescence excitation spectr oscopy. The T-upsilon=57=39943.5 cm(-1) of the 1(3) Sigma(g)(-), state is 385 cm(-1) above the X(2) Sigma(g)(+) upsilon(+)=0, J(+)=0 ionizat ion threshold and 9 cm(-1) below the Na (3p,P-2(3/2))+Na(3p,P-2(1/2)) dissociation limit. No significant line broadening was observed above the X(2) Sigma(g)(+)upsilon(+)=0,J(+)=0 ionization threshold with our resolution. Molecular constants and the Rydberg-Klein-Rees (RKR) poten tial curve have been obtained from the observed data. The major consta nts are T-e=36519.13(17) cm(-1) omega(e)=93.635(41) cm(-1), and B-e=0. 11895(90) cm(-1). We have carried out an all-electron ab initio calcul ation for the 1(3) Sigma(g)(-), State and transition dipole moment for the 1(3) Sigma(g)(-)<->b(3)II(u) system of Na-2. Molecular constants calculated from our ab initio potential curve have reasonable agreemen t with the experimental constants. (C) 1995 American Institute of Phys ics.