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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Parallel and Coupled Perpendicular Transitions of RbCs 640 nm System:Mass-Resolved Resonance Enhanced Two-Photon Ionization in a Cold Molecular Beam
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Parallel and Coupled Perpendicular Transitions of RbCs 640 nm System:Mass-Resolved Resonance Enhanced Two-Photon Ionization in a Cold Molecular Beam

机译:RbCs 640 nm系统的平行和垂直耦合跃迁:冷分子束中的质量分辨共振增强的双光子电离

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We have investigated the RbCs 640 nm system by mass-resolved resonance enhanced two-photon ionization in a cold molecular beam.Very complex vibronic structures were observed between 15420 and 15990 cm~(-1).The parallel transitions of 2 ~3II_0 v'=4-20<-X ~1SIGMA~+v"=0 were identified by rotationally resolved spectra.Molecular constants and a Rydberg-Klein-Rees potential energy curve of the 2 ~3II_0 state were determined.The regular vibrational spacing of the parallel transition indicated that the 2 ~3II_0 state is not significantly perturbed by nearby excited electronic states.The complexity of the observed vibronic structures has been attributed to the coupled perpendicular transitions of 2 ~1II,2 ~3II_1,and 3 ~3SIGMA_1~+<-X ~3SIGMA~+v"=0.For the perpendicular bands observed in the lower-energy spectral region between 15420 and 15630 cm~(-1)where the onsets of the 2 ~3II_1 and 3 ~3SIGMA_1~+<-X~3SIGMA~+transitions are located,the upper electronic states and the vibrational quantum numbers were assigned.Perturbations of 2 ~3II_1-3 ~3SIGMA_1~+and 2 ~1II-3 ~3SIGMA_1~+have been identified by the observed level shifts.
机译:我们通过在冷分子束中通过质量分辨共振增强双光子电离研究了RbCs 640 nm系统,在15420和15990 cm〜(-1)之间观察到非常复杂的振动电子结构,2〜3II_0 v'的平行跃迁通过旋转分辨谱确定= 4-20 <-X〜1SIGMA〜+ v“ = 0。确定了2〜3II_0态的分子常数和Rydberg-Klein-Rees势能曲线。平行线的规则振动间隔跃迁表明2〜3II_0状态不会被附近的激发电子状态显着扰动。观察到的电子振动结构的复杂性归因于2〜1II,2〜3II_1和3〜3SIGMA_1〜+ <-的耦合垂直跃迁。 X〜3SIGMA〜+ v“ = 0。对于在15420和15630 cm〜(-1)之间的低能谱区域中观察到的垂直带,其中2〜3II_1和3〜3SIGMA_1〜+ <-X〜的出现定位3SIGMA〜+跃迁,上电子态和振动量子数rs被指定。通过观察到的水平位移,确定了2〜3II_1-3〜3SIGMA_1〜+和2〜1II-3〜3SIGMA_1〜+的摄动。

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