Study on X-H(X=C,O or N) stretching vibration of electronically excited aromatic molecules and their clusters

电子激发芳香族分子及其簇的X-H(X=C,O或N)伸缩振动研究

• 批准号: 12640483
• 负责人: EBATA Takayuki
• 金额: $ 2.37万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12640483/
• 关键词: vibrational spectroscopy; supersonic jet; duble resonance technique; OH stretching vibration; hydrogen-bond; cluster; electoronic state; クラスター; 超音速ジェット; 振動分光; 二重共鳴法

The X-H(X=C,O or N) stretching vibrations of electronically excited aromatic molecules and their clusters have been investigated in supersonic jets. To observe those vibrations, new type of double-resonance spectroscopic technique has been developed, so called UV-IR double resonance spectroscopy. The systems investigated are the CH stretching vibration of benzene, toluene, the OH stretching vibration of naphthol and the NH stretching vibration of aniline in their S_1 state. Also investigated are the vibrations of their clusters. For benzene and toluene, we found that the aromatic CH stretching frequencies increase,'while those of methyl group decrease in S_1.For aniline, we found the NH stretching frequency decreases as large as 500 cm-1 in S_1. In addition, new electronically excited state has been found to locate 3200 cm^<-1> above S_1. The newly found state (S_2) is thought to be the πσ^* state.The OH stretching vibration of the H-bonded cluster of phenol has been also observed. It was found that the clusters excited to the H-bonded OH stretching vibration immediately relax, which is followed by the dissociation of the H-bond.

在超音速射流中研究了电子激发芳香族分子及其团簇的X-H(X=C、O或N)伸缩振动。为了观察这些振动，人们发展了一种新型的双共振光谱技术，称为UV-IR双共振光谱。所研究的体系是苯、甲苯的CH伸缩振动、萘酚的OH伸缩振动和苯胺在S_1态的NH伸缩振动。还研究了它们的团簇的振动。对于苯和甲苯，我们发现芳香族的CH伸缩频率增加，而甲基的伸缩频率在S_1中降低。对于苯胺，我们发现S_1的NH伸缩频率下降了500 cm~(-1)。此外，还发现新的电子激发态位于S_1上方的3200 cm^~(-1)。新发现的态(S_2)为πσ^*态。还观察到苯酚氢键簇合物的OH伸缩振动。研究发现，在氢键伸缩振动的激发下，团簇立即松弛，随后氢键解离。

项目成果

N.Guchhait: "Vibrational spectroscopy for size-selected fluorene-(H_2O)_<n=1-2>clusters in supersonic jets"J. Phys. Chem. A. 104. 11891-11896 (2000)

N.Guchhait：“超音速射流中尺寸选定的芴-(H_2O)_<n=1-2>团簇的振动光谱”J。

R.Yamamoto: "Mode dependent intracluster vibrational energy redistribution rate in size-selected beuzonitrile-(CHOl_3)_<n=1-3>clusters"J. Chem. Phys.. 114. 7886-7876 (2001)

R.Yamamoto：“尺寸选择的苯并腈-(CHOl_3)_<n=1-3>簇中模式依赖的簇内振动能量重新分配率”J。

Y.Matsumoto: "Photofragment-detected IR spectoscopy (PFDIRS) for the OH stretching vibration of the hydrogen-bonded clusters in the S, state-Application to 2-naphthol-B(B=H_2() and CH_3OH)clusters"J. Phys. Chem. A. 105. 5727-5730 (2001)

Y.Matsumoto：“用于 S 态氢键簇的 OH 伸缩振动的光碎片检测红外光谱 (PFDIRS) - 在 2-萘酚-B(B=H_2() 和 CH_3OH) 簇中的应用”J。

G.Naresh Patwari: "Dehydrogeneration reaction from a dihydrogen bonded precursor complex in the gas phase"J. Phys. Chem. A. 105. 10753-10758 (2001)

G.Naresh Patwari：“气相中二氢键合前体络合物的脱氢反应”J。

T.Ebata: "Vibrational relaxation of OH and OD stretching vibrations of phenol and its clusters studied by IR-UV pump-probe spectroscopy."J.Phys.Chem.A.. 104・34. 7974-7979 (2000)

T.Ebata：“通过 IR-UV 泵浦探针光谱研究苯酚及其簇的 OH 和 OD 伸缩振动的振动弛豫。”J.Phys.Chem.A. 104・34 (2000)。