화학공학소재연구정보센터
Journal of Chemical Physics, Vol.100, No.9, 6153-6159, 1994
Laser-Induced Fluorescence Spectroscopy of the B’ 1(U)-X 0(G)(+) Transition of Xe-2 - Determination of the B’ State Potential and Evidence for a Barrier to Dissociation
Ww report the observation of discrete and continuous laser induced fluorescence (LIF) spectra of th B’ 1(u)-X 0(g)(+) transition of Xe-2, near 68000 cm(-1). The discrete features continue 5 cm(-1) above the predicted atomic asymptote, which indicates the presence of a barrier to dissociation in the excited state. The dissociation (D’(e)=48+/-12 cm-1), and excited state constants (r’(e)=5.46+.-0.05 Angstrom, w’(e)=5.9+/-0.7 cm-1, and w(e)x’(e)=0.17+/-0.02 cm-1) for the B’ state were obtained from a Franck-Condon fit to the spectrum. The resulting potential is more shallow and has a longer equilibrium bond length compared with a previous experimentally derived potentia. The barrier to dissociation (2 cm-(1) less than or equal to h less than or equal to 10 cm(-1), r approximate to 10 Angstrom) is attributed to the presence of a long-range (alpha 1/r(3)) repulsion, arising from a dipole-dipole resonant interaction.