摘要
通过改变ＳＯ２／Ａｒ配比，研究了超声膨胀冷却ＳＯ２（Ａ１Ａ２—Ｘ１Ａ１）系统３１５—３３０ｎｍ波段振动分辨的激光诱导荧光（ＬＩＦ）激发谱．获得了属于两个完整带系（１，ｍ，１），（０，ｎ，１）—（０，０，０）的高分辨转动结构谱．其中（ν′１，ν′２，ν′３）＝（０，９，１），（０，１０，１），（１，７，１），（１，５，１）带的转动结构，据我们所知是新观测到的．基于非对称陀螺模拟，对８４７条转动谱线进行了归属，得到Ａ态各振动能级的分子常量和离心畸变常量．获得Ａ１Ａ２态近似分子构型参数：ｒ（Ｓ—Ｏ）＝０１６０ｎｍ，∠ＯＳＯ＝１０１６４°．并对各振动态的惯量亏损进行了讨论．
Abstract The influence of the different gas ratios (SO 2/Ar) on the vibronically resolved laser induced fluorescence excitation spectra of the SO 2( 1A 2? ? 1A 1) system was investigated under the supersonic jet conditions.High resolution spectra of two complete progressions (1, m,1),(0,n,1 ) were obtained,in which the rotational structures of the (0,9,1),(0,10,1),(1,7,1),(1,5,1) (0,0,0) bands were observed,for the first time,so long as we know.The assignments of 847 rotationally resolved lines were based on an asymmetric top simulation,which results in the determination of the rotational and centrifugal distortion constants of each vibrational level of state.The approximate geometry parameters of state was derived to be r (S—O)=0 160nm,∠OSO=101 64°.In addition,a discussion on the inertial defect of each vibrational level of state was presented.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
1998年第8期1258-1264,共7页
Acta Physica Sinica
基金
国家九五攀登计划
国家自然科学基金
