Development of picosecond IR-UV pump probe spectroscopy for molecular clusters

分子簇皮秒红外-紫外泵浦探针光谱学的发展

• 批准号: 10440165
• 负责人: EBATA Takayuki
• 金额: $ 8.38万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10440165/
• 关键词: Hydrogen-bond; Supersonic beam; Picosecond laser; Infrared; Double resonance; Vibrational relaxation; 赤外-紫外二重共鳴分光; 赤外分光; 二重共鳴; 分子クラスター

An experimental setup for the picosecond IR-UV double resonance spectroscopy has been constructed. The setup was developed to study the vibrational relaxation of molecular clusters formed in a supersonic beam. The setup consists of a mode-locked picosecond Nd:YAG laser and an opto-parametric system. A fundamental of the Nd:YAG laser is converted to 3 μm by OPG with the use of nonlinear crystal, which is used to pump the clusters to the CH or OH stretching vibration. A picosecond tunable UV light was also generated by the OPG system, which is used to monitor the vibratinally excited clusters by resonant enhance ionization. The two laser pulses were irradiated to the clusters in the supersonic beam. By changing the delay time between the IR and the UV pulses, the time profiles of the vibratinally excited states were monitored. It was found that the OH stretching vibration of phenol is 15 picoseconds and those its clusters are much faster.

建立了皮秒红外-紫外双共振光谱的实验装置。该装置是用来研究超音速束流中分子团簇的振动弛豫的。该装置由皮秒锁模激光器和光参量系统组成。利用非线性晶体泵浦原子团簇到CH或OH的伸缩振动，利用光学脉冲产生器将激光的一个基频转换为3μm。OPG系统还产生了皮秒可调谐紫外光，用于通过共振增强电离监测振动激发的团簇。这两个激光脉冲以超音速光束照射到星系团上。通过改变红外和紫外光脉冲之间的延迟时间，监测了振动激发态的时间分布。研究发现，苯酚的OH伸缩振动为15皮秒，其团簇的伸缩振动要快得多。

项目成果

Akira Mitsuzuka: "Infrared spectroscopy of intramolecular hydrogen-bonded OH stretching vibrations in jet-cooled methyl salicylate and its cluster"J.Chem.Phys.. A102. 9779-8784 (1998)

Akira Mitsuzuka：“喷射冷却水杨酸甲酯及其簇中分子内氢键 OH 伸缩振动的红外光谱”J.Chem.Phys.. A102。

Takayuki Ebata: "Mode-dependent anharmonic coupling between OH stretching and intermolecular vibrations of the hydrogen-bonded clusters of phenol" Chem.Phys.231(2,3). 199-204 (1998)

Takayuki Ebata：“苯酚氢键簇的 OH 伸缩和分子间振动之间的模式相关非和谐耦合”Chem.Phys.231(2,3)。

T. Ebata, K. Saito, H. Ishikawa, and N. Mikami: "Discrimination of s-cis/s-trans conformers of jet-cooled methyl cinnamate by population labeling spectroscopy"Res. Chem. Intermediates. 24(8). 803-812 (1998)

T. Ebata、K. Saito、H. Ishikawa 和 N. Mikami：“通过群体标记光谱法区分喷射冷却肉桂酸甲酯的 s-cis/s-trans 构象异构体”Res。

Y. Matsuda, T. Ebata, and N. Mikami: "Vibrational spectroscopy of 2-pyridone and its clusters in supersonic jets : Structures of the clusters as revealed by characteristic shifts of the NH and C=0 bands"J. Chem. Phys.. 110(17). 8397-8407 (1999)

Y. Matsuda、T. Ebata 和 N. Mikami：“超音速射流中 2-吡啶酮及其簇的振动光谱：NH 和 C=0 谱带的特征位移揭示了簇的结构”J。

Eiji Fujimaki: "Autoionization-detected infrared spectroscopy of intramolecular hydrogen bonds in aromatic cations. I Principle and application to fluorophenol and methoxylphenol"J.Chem.Phys.. 110. 4238-4247 (1999)

Eiji Fujimaki：“芳香族阳离子中分子内氢键的自动电离检测红外光谱。I 原理及其在氟苯酚和甲氧基苯酚中的应用”J.Chem.Phys.. 110. 4238-4247 (1999)