Multiphoton Ionization and Dissociation of Metastable Molecular Species

亚稳态分子的多光子电离和解离

• 批准号: 59470010
• 负责人: SATO Hiroyasu
• 金额: $ 4.48万
• 依托单位: Mie University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1984
• 资助国家: 日本
• 起止时间: 1984 至 1986
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-59470010/
• 关键词: Multiphoton Ionization; Multiphoton Dissociation; Rydberg States; Trialkilamines; Iodine; Thioformaldehyde; 有機金属化合物

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.

进行了以下研究（1-4）。研究了三甲基胺（TMA）和三乙胺（TEA）的里德堡态多光子电离过程.用染料激光器激发TEA，研究了2+1 MPI过程，并确定了无振动态的能级<S_2>。对于TMA，<S_2>利用Nd^（2+）：YAG激光器的二次谐波反斯托克斯光，通过振动激发能级进行1+1 MPI过程，揭示了预备<S_2>态（&lt;S（_2^*）&gt;）和振动激发态（&lt;S（_1^（double-dagger））&gt;）电离的竞争过程，这是由&lt;S（_2^*）&gt; -&gt; &lt;S（_1^（double-dagger））&gt;引起的.由光学三重共振产生的高激发排斥态的离解<I_2>。通过解离给出的&lt;I^*&gt;原子在206.3 nm处的发射来监测该过程。通过<1_u>模拟得到了其中一个产生&lt;I^*&gt; +I的态的势能曲线.通过&lt;-！C^1&gt;<B_2>（4s &lt;- n）里德堡态。用染料激光器进行2+2多光子电离（MPI）激发，获得了硫代甲醛分子C态的MPI谱。对MPI谱的转动结构的模拟揭示了中间态分子排列的影响.激光照射金属板使有机金属化合物电离。将来自&lt;Nd^（2+）&gt;：YAG激光器的激光（基波、二次谐波、三次谐波和四次谐波）聚焦在金属板上。将有机金属化合物的分子束注入板的附近。产物的质量分析显示有机金属离子的产生，沿着来自板的金属离子。讨论了有机金属离子的产生机理。

项目成果

M. Kawasaki, H. Sato, A. Fukuroda, T. Kikuchi, S. Kobayashi and T. Arikawa: "Angular Distributions of Photofragments from <NO_2> Photodissociation" Journal of Chemical Physics.

M. Kawasaki、H. Sato、A. Fukuroda、T. Kikuchi、S. Kobayashi 和 T. Arikawa：“<NO_2> 光解离的光碎片的角分布”化学物理杂志。

K.Kasatani;J.Ito;M.Kawakaki;H.Sato: Chemical Physics Letters. 122. 113-117 (1985)

K.Kasatani；J.Ito；M.Kawakaki；H.Sato：化学物理快报。

H. Sato, M. Kawasaki, K. Toya, K. Sato and K. Kimura: "Photoelectron Spectroscopic Evidence for the Competition of Ionization and Internal Conversion at the <S_2> Excited State of Triethylamine" Journal of Physical Chemistry. 91. 751-754 (1987)

H. Sato、M. Kawasaki、K. Toya、K. Sato 和 K. Kimura：“三乙胺 <S_2> 激发态电离和内部转换竞争的光电子光谱证据”物理化学杂志。

K. Kasatani, J. Iot, M. Kawasaki and H. Sato: "A Highly Excited Repulsive State of <I_2> Studied by Optical Triple Resonance" Chemical Physics Letters. 122. 113-117 (1985)

K. Kasatani、J. Iot、M. Kawasaki 和 H. Sato：“通过光学三重共振研究的 <I_2> 的高度激发排斥态”化学物理快报。

M. Kawasaki, H. Sato, T. Kikuchi, A. Fukuroda, S. Kobayashi, and T. Arikawa: "Angular Distributions of Photofragments Generated in the Two-photon Dissociation of Nitrogen Dioxide and Carbon Disulfide" Journal of Chemical Physics.

M. Kawasaki、H. Sato、T. Kikuchi、A. Fukuroda、S. Kobayashi 和 T. Arikawa：“二氧化氮和二硫化碳双光子解离中产生的光碎片的角分布”化学物理杂志。