Multiphoton Ionization and Dissociation of Metastable Molecular Species

进行了以下研究（1-4）。三甲胺（TMA）和三乙胺（TEA）的里德堡态多光子电离（MPI）过程对于TEA，采用染料激光激发，研究了2+1 MPI过程，确定了<S_2>无振动态的能级。对于TMA，在<Nd^(2+)>: YAG激光器的2次谐波反散射光下，通过振动激发<S_2>能级进行1+1 MPI过程，发现制备的<S_2>态（<S(_2^*)>）和由内部转换<S(_2^*)> -> <S（_1^（双匕首））> .2引起的振动激发<S（_1^（双匕首））>态发生了竞争电离过程。光学三重共振产生的<I_2>高激发态解离。用解离得到的<I^*>原子在206.3 nm处的发射光谱监测了这一过程。通过模拟得到了产率<I^*> +I的<1_u>态的势能曲线。硫代甲醛经<-！C^1> <B_2> (4s <- n)里德伯态。用染料激光进行2+2 MPI激发，得到了硫代甲醛在C态的MPI光谱。对MPI光谱旋转结构的模拟揭示了分子取向在中间态的影响。金属板上激光照射有机金属化合物的电离。从<Nd^(2+)>: YAG激光器发出的激光（基频、二、三、四次谐波）聚焦在金属板上。将金属有机化合物的分子束注入到板的附近。产品的质量分析表明，有机金属离子的产生，伴随着金属离子从板。讨论了有机金属离子的生成机理。

The following studies (1-4) were made.1. Multiphoton ionization (MPI) processes of trimethylamine (TMA) and triethylamine (TEA) via Rydberg states. For TEA, a 2+1 MPI process was studied by excitation with a dye laser, and the energy level of the vibrationless <S_2> state was determined. For TMA, a 1+1 MPI process via a vibrationally excited <S_2> level with the anti-stodes light of 2nd harmonic of an <Nd^(2+)> : YAG laser revealed the occurrence of competitive process of the ionization from the prepared <S_2> state ( <S(_2^*)> ) and that from the vibrationally excited <S(_1^(double-dagger))> state which resulted from the internal conversion <S(_2^*)> -> <S(_1^(double-dagger))> .2. Dissociation from a highly excited repulsive state of <I_2> produced by optical triple resonance. This process was monitored with the emission at 206.3 nm from the <I^*> atom given by dissociation. A potential energy curve of one of the <1_u> states which yield <I^*> +I was obtained by a simulation procedure.3. MPI of thioformaldehyde via the <-!C^1> <B_2> (4s <- n) Rydberg state. The MPI spectrum of thioformaldehyde via the C state was obtained by a 2+2 MPI excitation with a dye laser. A simulation of the rotational structure of the MPI spectrum revealed the effect of molecular alignment in the intermediate state.4. Ionization of organometallic compound by laser irradiation on a metal plate. Laser light from an <Nd^(2+)> : YAG laser (fundamental, 2nd, 3rd and 4th harmonics) was focused on a metal plate. A molecular beam of organometallic compound was injected in the neighborhood of the plate. Mass analysis of the product showed the production of organometallic ions, along with the metal ions from the plate. The mechanism of production of organometallic ions was discussed.