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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Vibronic Relaxation among the Clements Bands of SO_2 from the E-Band Excitation
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Vibronic Relaxation among the Clements Bands of SO_2 from the E-Band Excitation

机译：E波段激发下SO_2元素带中的电子振动弛豫

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摘要

Vibronic relaxation among the Clements bands of SO_2 molecule has been studied from time-resolved fluorescence spectra in the 300-350 nm region. THe K' = 6, J' = 7 level of the Clements E-band was populated at 32 812.8 cm~(-1), and detailed time-resolved fluorescence spectra for the period 0-160 ns were obtained. Following the fast decay of the laser excited level, weak emissions from Clements A-F bands appeared almost simultaneously. The simultaneous appearance of many Clements bands was attributed to fast rovibronic relaxation of the laser excited molecules among the dark levels. It was also found that the broad apparent continuum emission following the direct fluorescence showed different decay rates at different wavelengths, but the decay rates of the emissions for #lambda# > 350 nm were virtually identical. Based on the wavelength dependence of the decay rates, the apparent continuum emissions were ascribed to the emissions from the rovibronically dispersed hybrid bright states and the low-lying rovibrational levels of the A-tilde~1A_2 state generated by collisional relaxation of the laser-excited level.
机译：从时间分辨的300-350 nm范围内的荧光光谱研究了SO_2分子Clements谱带之间的振动松弛。 K'= 6，J'= 7水平的Clements E波段分布在32 812.8 cm〜（-1），并获得了0-160 ns期间的详细时间分辨荧光光谱。随着激光激发能级的快速衰减，克莱门茨A-F波段几乎同时出现了微弱的发射。许多克莱门特斯谱带的同时出现归因于在黑暗水平中激光激发分子的快速电子振动弛豫。还发现直接荧光后的宽广的表观连续性发射在不同波长下显示出不同的衰减率，但对于＃lambda＃> 350 nm，发射的衰减率实际上是相同的。基于衰减率的波长依赖性，表观连续谱发射被归因于激光散射分散的混合光亮态的低发射和激光激发的碰撞弛豫所产生的低平动水平的A-tilde〜1A_2振动。水平。

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