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超快二维红外光谱用于研究单体水分子中的直接振动能量传递
周德霞,魏千顺,边红涛*,郑俊荣*
作者单位E-mail
周德霞 陕西师范大学化学化工学院, 应用表面与胶体化学教育部重点实验室, 西安 710119  
魏千顺 陕西师范大学化学化工学院, 应用表面与胶体化学教育部重点实验室, 西安 710119  
边红涛* 陕西师范大学化学化工学院, 应用表面与胶体化学教育部重点实验室, 西安 710119 htbian@snnu.edu.cn 
郑俊荣* 北京大学化学与分子工程学院, 北京分子科学国家实验室, 北京 100871 junrong@pku.edu.cn 
摘要:
关键词:  
DOI:10.1063/1674-0068/30/cjcp1710189
分类号:
基金项目:This work was supported by the Shaanxi Normal University (No.1110010767), the National Natural Science Foundation of China (No.21603137) and the Fundamental Research Funds for the Central Universities (No.GK201701004).
Direct Vibrational Energy Transfer in Monomeric Water Probed with Ultrafast Two Dimensional Infrared Spectroscopy
De-xia Zhou,Qian-shun Wei,Hong-tao Bian*,Jun-rong Zheng*
Abstract:
Vibrational relaxation dynamics of monomeric water molecule dissolved in d-chloroform solution were revisited using the two dimensional Infrared (2D IR) spectroscopy. The vibrational lifetime of OH bending in monomeric water shows a bi-exponential decay. The fast component (T1=(1.2±0.1) ps) is caused by the rapid population equilibration between the vibrational modes of the monomeric water molecule. The slow component (T2=(26.4±0.2) ps) is mainly caused by the vibrational population decay of OH bending mode. The reorientation of the OH bending in monomeric water is determined with a time constant of τ=(1.2±0.1) ps which is much faster than the rotational dynamics of water molecules in the bulk solution. Furthermore, we are able to reveal the direct vibrational energy transfer from OH stretching to OH bending in monomeric water dissolved in d-chloroform for the first time. The vibrational coupling and relative orientation of transition dipole moment between OH bending and stretching that effect their intra-molecular vibrational energy transfer rates are discussed in detail.
Key words:  Vibrational energy transfer  Confined water  Ultrafast Infrared spectroscopy  Monomeric water