Transient grating study of the intermolecular dynamics of liquid nitrobenzene

doi:10.1088/1674-1056/25/10/107802

中国物理B ›› 2016, Vol. 25 ›› Issue (10): 107802-107802.doi: 10.1088/1674-1056/25/10/107802

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Transient grating study of the intermolecular dynamics of liquid nitrobenzene

Hong-Lin Wu(吴红琳), Yun-Fei Song(宋云飞), Guo-Yang Yu(于国洋), Yan-Qiang Yang(杨延强)

1 Department of Physics, Harbin Institute of Technology, Harbin 150001, China;
2 Laboratory for Shock Wave and Detonation Physics Research, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China

收稿日期:2016-05-05 修回日期:2016-05-27 出版日期:2016-10-05 发布日期:2016-10-05
通讯作者: Yan-Qiang Yang E-mail:yqyang@hit.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11304058 and 11404307) and NSAF (Grant No. U1330106).

Transient grating study of the intermolecular dynamics of liquid nitrobenzene

Hong-Lin Wu(吴红琳)¹, Yun-Fei Song(宋云飞)², Guo-Yang Yu(于国洋)², Yan-Qiang Yang(杨延强)^1,2

1 Department of Physics, Harbin Institute of Technology, Harbin 150001, China;
2 Laboratory for Shock Wave and Detonation Physics Research, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China

Received:2016-05-05 Revised:2016-05-27 Online:2016-10-05 Published:2016-10-05
Contact: Yan-Qiang Yang E-mail:yqyang@hit.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11304058 and 11404307) and NSAF (Grant No. U1330106).

摘要/Abstract

摘要： Femtosecond time-resolved transient grating (TG) technique is used to study the intermolecular dynamics in liquid phase. Non-resonant excitation of the sample by two crossing laser pulses results in a transient Kerr grating, and the molecular motion of liquid can be detected by monitoring the diffraction of a third time-delayed probe pulse. In liquid nitrobenzene (NB), three intermolecular processes are observed with lifetimes of 37.9±1.4 ps, 3.28±0.11 ps, and 0.44±0.03 ps, respectively. These relaxations are assigned to molecular orientational diffusion, dipole/induced dipole interaction, and libration in liquid cage, respectively. Such a result is slightly different from that obtained from OKE experiment in which the lifetime of the intermediate process is measured to be 1.9 ps. The effects of electric field on matter are different in TG and optical Kerr effect (OKE) experiments, which should be responsible for the difference between the results of these two types of experiments. The present work demonstrates that TG technique is a useful alternative in the study of intermolecular dynamics.

关键词: transient grating, intermolecular dynamics, liquid nitrobenzene

Abstract: Femtosecond time-resolved transient grating (TG) technique is used to study the intermolecular dynamics in liquid phase. Non-resonant excitation of the sample by two crossing laser pulses results in a transient Kerr grating, and the molecular motion of liquid can be detected by monitoring the diffraction of a third time-delayed probe pulse. In liquid nitrobenzene (NB), three intermolecular processes are observed with lifetimes of 37.9±1.4 ps, 3.28±0.11 ps, and 0.44±0.03 ps, respectively. These relaxations are assigned to molecular orientational diffusion, dipole/induced dipole interaction, and libration in liquid cage, respectively. Such a result is slightly different from that obtained from OKE experiment in which the lifetime of the intermediate process is measured to be 1.9 ps. The effects of electric field on matter are different in TG and optical Kerr effect (OKE) experiments, which should be responsible for the difference between the results of these two types of experiments. The present work demonstrates that TG technique is a useful alternative in the study of intermolecular dynamics.

Key words: transient grating, intermolecular dynamics, liquid nitrobenzene

中图分类号: (Transient grating spectroscopy)

78.47.jj

87.15.hg (Dynamics of intermolecular interactions) 61.25.Em (Molecular liquids)

吴红琳, 宋云飞, 于国洋, 杨延强. Transient grating study of the intermolecular dynamics of liquid nitrobenzene[J]. 中国物理B, 2016, 25(10): 107802-107802.

Hong-Lin Wu(吴红琳), Yun-Fei Song(宋云飞), Guo-Yang Yu(于国洋), Yan-Qiang Yang(杨延强). Transient grating study of the intermolecular dynamics of liquid nitrobenzene[J]. Chin. Phys. B, 2016, 25(10): 107802-107802.

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Transient grating study of the intermolecular dynamics of liquid nitrobenzene

Transient grating study of the intermolecular dynamics of liquid nitrobenzene

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