Shestakov O, Gielen R, Fink EH
Physikalische Chemie, Fachbereich 9, Bergische Universität-Gesamthochschule Wuppertal, Wuppertal, D-42097, Germany
J Mol Spectrosc. 1998 Nov;192(1):111-118. doi: 10.1006/jmsp.1998.7674.
Electronic spectra of the recently discovered BiOH and BiOD radicals have been studied by means of laser-induced fluorescence measurements in the 400-1000 nm range. Laser excitation spectra observed in the range 430-450 nm are attributed to transitions from the &Xtilde;1A' ground state to the theoretically predicted Ã1A' state. Fluorescence spectra from the Ã1A',nu'3 = 0, 1 levels consist of short nu"3 progressions to the lower states &Xtilde;1A', &Xtilde;3A', and ã1A'. Laser excitation spectra in the range 580-620 nm contain bands with both DeltaKa = 0 and DeltaKa = +/-1 subbands. They are attributed to hybrid bands of the Ã1A' <-- &Xtilde;3A' transition. Analyses of the spectra have yielded vibronic energy levels of the &Xtilde;1A', &Xtilde;3A', ã1A', and Ã1A' states of both isotopes and effective rotational constants A - 1/2(B + C) and DK for some levels. The radiative lifetime of the Ã1A',000 state was found to be 0.92 +/- 0.03 µs. Copyright 1998 Academic Press.
通过在400 - 1000纳米范围内的激光诱导荧光测量，对最近发现的BiOH和BiOD自由基的电子光谱进行了研究。在430 - 450纳米范围内观察到的激光激发光谱归因于从基态(\widetilde{X}^{1}A')到理论预测的(\widetilde{A}^{1}A')态的跃迁。来自(\widetilde{A}^{1}A')，(\nu'{3}=0)、(1)能级的荧光光谱由向较低态(\widetilde{X}^{1}A')、(\widetilde{3}A')和(\widetilde{a}^{1}A')的短(\nu''{3})进展组成。在580 - 620纳米范围内的激光激发光谱包含(\Delta K_{a}=0)和(\Delta K_{a}=\pm1)子带的谱带。它们归因于(\widetilde{A}^{1}A'\leftarrow\widetilde{3}A')跃迁的混合谱带。光谱分析得出了两种同位素的(\widetilde{X}^{1}A')、(\widetilde{3}A')、(\widetilde{a}^{1}A')和(\widetilde{A}^{1}A')态的振动电子能级以及某些能级的有效转动常数(A-\frac{1}{2}(B + C))和(D_{K})。发现(\widetilde{A}^{1}A')，(000)态的辐射寿命为(0.92\pm0.03)微秒。版权所有1998年学术出版社。
