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DIODE LASER SPECTROSCOPY OF CLUSTERS PRODUCED BY THE PICK-UP METHOD

拾取法产生的团簇的二极管激光光谱

基本信息

批准号：
06640667
负责人：
OZAKI Yasushi
金额：
$ 1.28万
依托单位：
JOSAI UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06640667/
关键词：
CLUSTER INFRARED SPECTROSCOPY DIODE LASER SPECTROSCOPY PICK-UP METHOD MOLECULAR DYNAMIC CALCULATION

项目摘要

The vibrational motion of Ar clusters having isomers in a variety of shapes was simulated by the molecular dynamics method. It was found that only the breathing vibration was excited in nearly spherical isomers, while signifin cant excitation of the quadruple spheroidal vibration was observed in non-spherical isomers. The excitation of the quadruple spheroidal vibration was found to be closely related to the degrees of sphericality fo the isomers. On the other hand, when a non-spherical Ar_<30> was excited, three strong peaks were observed in the spectra. One of the three peaks was assigned to the bending vibration of the cluster in whole.Molecular exchange reaction of an argon cluster, in collision with a CO_2 molecule by pick-up method was investigated by mass spectrometry. Binary clusters, Ar_mCO_2, were found to be produced in the molecular exchange reaction. The measured reaction cross section and the average numbers of release Ar atoms in the reaction were almost consistent with those calculated by the molecular dynamics method.Molecular exchange reaction of (CO_2)_n cluster, in collision with CH_3OH by pick-up method was investigated by mass spectrometry. An apparatus for measurement of vibration-rotation spectra of dimers was assembled with a diode laser and the vibration-rotation spectrum of (CO_2)_2 was measured. Peaks of the spectrum was found to disappear when CH_3OH was introduced, indicating that (CO_2)_2 was attenuated by the pick-up method.

用分子动力学方法模拟了具有不同形状异构体的Ar簇的振动运动。在近球形异构体中，只有呼吸振动被激发，而在非球形异构体中，四重球体振动被显著激发。发现四重球振动的激发与同分异构体的球度密切相关。另一方面，当激发非球形Ar_<30>时，在光谱中观察到三个强峰。三个峰值中的一个被分配给整个簇的弯曲振动。用质谱法研究了氩气团簇与CO_2分子碰撞后的分子交换反应。在分子交换反应中发现了二元簇Ar_mCO_2。测定的反应截面和反应中平均释放的Ar原子数与分子动力学方法计算的结果基本一致。用质谱法研究了（CO_2）_n簇与CH_3OH碰撞时的分子交换反应。用二极管激光器组装了二聚体的振动-旋转光谱测量仪，测量了（CO_2）_2的振动-旋转光谱。加入CH_3OH后，谱峰消失，表明（CO_2）_2被吸收法减弱。