NO分子X^2Π→A^2Σ双光子跃迁选择定则的讨论

Study about two photon transition selection rule of NO via X^2Π→A^2Σ transition

利用共振增强多光子离化光谱技术 ,获得了NO分子A2 Σ(υ′=0 ,1)态的 2 + 2共振多光子离化光谱。通过对上述离化过程中NO分子所表现出的不同于普通双原子分子的双光子跃迁选择定则的分析与讨论 ,得出NO分子由基态向A2 Σ态的双光子跃迁遵循与碱金属原子双光子跃迁选择定则相类似的结论 ,并利用NO分子A2 Σ(υ′ =0 ,1)态的双光子荧光激发光谱对上述分析结论进行了进一步的确认。

Two-photon resonance in the 4-photon ionization spectrum via intermediate A 2Σ state has been obtained.The special two-photon transition selection rule in the spectrum mentioned above is studied,and the result showed that the two-photon transition selection rule of NO is analogous to that of alkali atom,which is different from two-photon transition selection rule of the usual diatomic molecule.Further,the conclusion is affirmed by the two-photon fluorescence excitation spectrum of NO.