Ab initio studies on the vacuum ultraviolet (VUV) excimer emission spectra of NeB+ and ArB+

In the ab initio calculations the NeB+ and ArB+ diatomic ions are found to emit the excimer-type bound-free broad bands in the vacuum ultraviolet region. The emission band from the v′=0 of the lowest singlet excited state 1Π of NeB+ has a peak at 72 000 cm−1 (139 nm), while the spectrum from the v′=1 state exhibits two peaks at 73 500 and 70 200 cm−1, which reflects the node of the vibrational wave function of the initial state. The calculated lifetime of the v′=0 state is 1 ns. The corresponding band of the v′=0 of ArB+ peaks at 49 000 cm−1 (204 nm) and the lifetime is 6 ns.