2,4-二氟苯酚S_1态的振动量子干涉的直接观测
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- 英文论文题名：Direct observation of vibrational quantum interference on the S_1 state of 2,4-difluorophenol
- 论文作者：凌丰姿 ; 张冰
- 英文论文作者：Fengzi Ling ; Bing Zhang ; Laboratory of Magnetic Resonance and Atomic and Molecular Physics ; Wuhan Institute of Physics and Mathematics ; Chinese Academy of Sciences
- 年：2016
- 作者机构：武汉物理与数学研究所中国科学院大学;
- 论文关键词：2 ; 4-二氟苯酚 ; 量子拍频 ; 隧穿
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第四十四分会：化学动力学
- 语种：中文
- 分类号：O621.1
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第四十四分会 ; 化学动力学
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：158k
- 原文格式：D
- 会议级别：全国
摘要
利用飞秒时间分辨的离子产率光谱研究了2,4-二氟苯酚的低激发态S_1态的超快无辐射衰减动力学过程,得到的母体离子信号随泵浦一探测延迟时间呈指数衰减并伴有周期性的振荡,这是一种量子拍频现象。测得S_1态通过S_1/S_2锥形交叉隧穿至S_2解离态的时间为4.3ns。同时也对反映量子相干现象的数据进行拟合,得到量子拍频的频率为87cm~(-1),这对应的是X的振动量子数为1的振动能级与10b的振动量子数为2的振动能级相互干涉的结果。改变探测光波长至243nm后拍频消失,验证了拍频的观测对于探测波长的敏感性
The fast nonradiative decay dynamics of the lowest excited electronic state(S_1) of 2,4-difluorophenol(2,4-DFP) have been investigated by using femtosecond time-resolved ion yield(TR-IY) spectra. The observed parent ion transients exhibit periodic coherent oscillations superimposed on the exponential temporal decay profiles. The tunneling lifetime of S_1 state via an S_1/S_2 conical intersection was determined to be 4.3ns. Furthermore, we demonstrate direct observation of the vibrational quantum beats clearly created by coherent excitation of the vibrational eigenstates. The time-intensity map of 2,4-DFP+ reveals the nuclear motion along the out-of-plane bending vibration coordinates in the S_1 state.
The fast nonradiative decay dynamics of the lowest excited electronic state(S_1) of 2,4-difluorophenol(2,4-DFP) have been investigated by using femtosecond time-resolved ion yield(TR-IY) spectra. The observed parent ion transients exhibit periodic coherent oscillations superimposed on the exponential temporal decay profiles. The tunneling lifetime of S_1 state via an S_1/S_2 conical intersection was determined to be 4.3ns. Furthermore, we demonstrate direct observation of the vibrational quantum beats clearly created by coherent excitation of the vibrational eigenstates. The time-intensity map of 2,4-DFP+ reveals the nuclear motion along the out-of-plane bending vibration coordinates in the S_1 state.
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