利用时间分辨（e, 2e）电子动量谱学研究丙酮 S2 激发态的分子轨道成像。

Molecular orbital imaging of the acetone S2 excited state using time-resolved (e, 2e) electron momentum spectroscopy.

机构信息

Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan.

Department of Applied Chemistry, Institute of Molecular Science, National Chiao-Tung University, Hsinchu 30050, Taiwan.

出版信息

Phys Rev Lett. 2015 Mar 13;114(10):103005. doi: 10.1103/PhysRevLett.114.103005.

DOI:10.1103/PhysRevLett.114.103005

PMID:25815930

Abstract

We report a time-resolved (e, 2e) experiment on the deuterated acetone molecule in the S2 Rydberg state with a lifetime of 13.5 ps. The acetone S2 state was prepared by a 195 nm pump laser and probed with electron momentum spectroscopy using a 1.2 keV incident electron beam of 1 ps temporal width. In spite of the low data statistics as well as of the limited time resolution (±35 ps) due to velocity mismatch, the experimental results clearly demonstrate that electron momentum spectroscopy measurements of short-lived transient species are feasible, opening the door to time-resolved orbital imaging in momentum space.

摘要

我们报告了一个在氘代丙酮分子 S2 里德堡态的时间分辨（e, 2e）实验，该态的寿命为 13.5 ps。丙酮 S2 态由 195nm 泵浦激光制备，并使用具有 1ps 时间宽度的 1.2keV 入射电子束进行电子动量谱探测。尽管数据统计量低，以及由于速度失配导致的时间分辨率有限（±35 ps），实验结果清楚地表明，对短寿命瞬态物种的电子动量谱测量是可行的，为在动量空间中进行时间分辨轨道成像开辟了道路。