Abstract
We have investigated the laser-induced fluorescence (LIF) excitation spectra and dispersed fluorescence (DF) spectra of yttrium monosulfide (YS) in the energy range of 17860–20700cm−1. Rotational analyses indicated that almost all of the intense vibronic bands can be attributed to the new [19.38]2Σ+(υ′)-X2Σ+(υ″) transition system. The missing (1, 2), (2, 1) and (3, 3) bands are caused by their very small Franck–Condon factors, as confirmed by our calculations. The new 2Σ+ state has been suggested to arise from the electronic configuration of (core)1σ22σ21π33σ2π, featuring a charge-transfer nature. Moreover, the spin-rotation parameter γ for the newly observed 2Σ+ state has been determined to be 0.0206cm−1, the magnitude of which is larger than the known γ(X2Σ+) (0.001427cm−1) but smaller than γ(B2Σ+) (−0.1515cm−1).
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