Experimental exploration of structural transformation of isolated small many-body systems
孤立小型多体系统结构变换的实验探索
基本信息
- 批准号:14340180
- 负责人:
- 金额:$ 9.47万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (B)
- 财政年份:2002
- 资助国家:日本
- 起止时间:2002 至 2004
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
This research project aims at deeper understanding on structural phase transformation, such as melting, via experimental exploration on isolated gas-phase clusters, which are typical systems with limited number of degrees of freedom. We have planned to characterize their energy-level structure of vibrations pertinent to structural transformation by utilizing laser spectroscopy, and to probe in real time the motion of molecules along with the structural transformation by femto-second time-resolved spectroscopy. We have achieved experimental data on some important systems and developed a new experimental method, as follows.1) Electronic spectra of benzene clusters have been reexamined by using mass-selective resonance-enhanced ionization. In contrast that hexamer and the smaller clusters exhibit sharp vibronic bands, the larger clusters show broad absorption. This observation implies the coexistence of many structural isomers and/or large structural fluctuation for the larger clusters. Sudden change in the morphology of potential energy surfaces pertinent to structural transformation may occur at this cluster size.2) Clusters containing aromatic molecules with protic solvents, i.e., anthracene-ammonia and benzene-water, have been studied. Weak vibronic bands pertinent to intermolecular modes have been observed with good S/N by utilizing laser double resonance. The present data will be essential to construct the intermolecular potential with high accuracy.3) A time-resolved spectroscopic method in femto-second regime has been developed for real-time probing of structural transformation motions. The versatility of the method have been demonstrated by the successful observation of vibrational and rotational wavepackets of various molecules. In particular, wavepacket of the internal-rotation of a methyl group has been observed for the first time.
该研究项目旨在通过对孤立气相团簇的实验探索,加深对结构相变(如熔化)的理解,这些团簇是具有有限自由度的典型系统。我们计划通过利用激光光谱学来表征与结构转变相关的振动的能级结构,并通过飞秒时间分辨光谱学来沿着结构转变的分子运动进行真实的探测。我们获得了一些重要体系的实验数据,发展了一种新的实验方法,具体如下:1)用质量选择共振增强电离方法重新研究了苯团簇的电子光谱。相比之下,六聚体和较小的簇表现出尖锐的电子振动带,较大的簇表现出广泛的吸收。这一观察结果意味着许多结构异构体的共存和/或大的结构波动较大的集群。与结构转变有关的势能表面形态的突然变化可能发生在该簇尺寸下。2)含有芳香族分子与质子溶剂的簇,即,蒽-氨和苯-水体系。利用激光双共振技术,观察到了与分子间模有关的弱电子振动带,具有良好的信噪比。这些数据对于构造高精度的分子间相互作用势是必不可少的。3)发展了一种用于实时探测结构相变运动的飞秒时间分辨光谱方法。该方法的多功能性已被各种分子的振动和转动波包的成功观测所证实。特别地,首次观察到了甲基内旋转的波包。
项目成果
期刊论文数量(52)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
S1-S0 vibronic spectra of benzene clusters revisited. II. Trimer
重新审视苯簇的 S1-S0 电子振动光谱。
- DOI:
- 发表时间:2002
- 期刊:
- 影响因子:0
- 作者:T.Iimori;Y.Ohshima
- 通讯作者:Y.Ohshima
Pendular-state spectroscopy of the S1-S0 transition of 9-cyanoanthracene
9-氰基蒽的 S1-S0 跃迁的摆动态光谱
- DOI:
- 发表时间:2004
- 期刊:
- 影响因子:0
- 作者:R.Kanya;Y.Ohshima
- 通讯作者:Y.Ohshima
T.Iimori, et al.: "S_1-S_0 vibronic spectra of benzene clusters revisited. II. Trimer"Journal of Chemical Physics. 117. 3675-3686 (2002)
T.Iimori 等人:“重新审视苯簇的 S_1-S_0 振动光谱。II. 三聚体”化学物理杂志。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
Determination of dipole moment change on the electronic excitation of isolated Coumarin 153 by pendular-state spectroscopy
- DOI:10.1016/s0009-2614(03)00075-7
- 发表时间:2003-03
- 期刊:
- 影响因子:2.8
- 作者:R. Kanya;Y. Ohshima
- 通讯作者:R. Kanya;Y. Ohshima
FTMW spectroscopy of jet-cooled 9-Cyanoanthracene
喷射冷却 9-氰基蒽的 FTMW 光谱
- DOI:
- 发表时间:2004
- 期刊:
- 影响因子:0
- 作者:Y.Ohshima;R.Kanya;Y.Sumiyoshi;Y Endo
- 通讯作者:Y Endo
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OHSHIMA Yasuhiro其他文献
OHSHIMA Yasuhiro的其他文献
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{{ truncateString('OHSHIMA Yasuhiro', 18)}}的其他基金
Development of a lecture support system for `moving interactive figures' on blackboard
黑板上“移动互动人物”讲座支持系统的开发
- 批准号:
26750092 - 财政年份:2014
- 资助金额:
$ 9.47万 - 项目类别:
Grant-in-Aid for Young Scientists (B)
The novel mechanism of cancer radioresistance on internal radiation therapy and development of radiosensitizers
癌症放射抗性的内放射治疗新机制及放射增敏剂的开发
- 批准号:
23791463 - 财政年份:2011
- 资助金额:
$ 9.47万 - 项目类别:
Grant-in-Aid for Young Scientists (B)
Design and reconstruction of quantum states of molecular motion
分子运动量子态的设计与重建
- 批准号:
22245004 - 财政年份:2010
- 资助金额:
$ 9.47万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
Observation and control of conformation dynamics by intense coherent light
强相干光对构象动力学的观察和控制
- 批准号:
18205005 - 财政年份:2006
- 资助金额:
$ 9.47万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
Study on Microscopic Solvation Effects on Nonradiative Processes
非辐射过程微观溶剂化效应研究
- 批准号:
10440172 - 财政年份:1998
- 资助金额:
$ 9.47万 - 项目类别:
Grant-in-Aid for Scientific Research (B).
Real-time probing of Energy Dissipation Processes in Solvated Clusters
溶剂化团簇中能量耗散过程的实时探测
- 批准号:
08454177 - 财政年份:1996
- 资助金额:
$ 9.47万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
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