激光引发水分子在氢键位点之间的穿梭。

Laser-initiated shuttling of a water molecule between H-bonding sites.

作者信息

Clarkson Jasper R, Baquero Esteban, Shubert V Alvin, Myshakin Evgeniy M, Jordan Kenneth D, Zwier Timothy S

机构信息

Department of Chemistry, 560 Oval Drive, Purdue University, West Lafayette, IN 47907-2084, USA.

出版信息

Science. 2005 Mar 4;307(5714):1443-6. doi: 10.1126/science.1106977. Epub 2005 Feb 3.

DOI:10.1126/science.1106977

PMID:15692014

Abstract

The two-step laser excitation scheme of stimulated emission pumping (SEP) induces shifts of a single water molecule between two remote hydrogen bonding sites on trans-formanilide. This reaction can be initiated by selective excitation of either isomer (CO-bound or NH-bound) with different SEP excitation wavelengths. Energy (E) thresholds for isomerization in both directions have been measured [796 wave numbers </= E(CO-->NH) </= 988 wave numbers and 750 wave numbers </= E(NH-->CO) </= 988 wave numbers], and the energy difference DE between the CO-bound and NH-bound isomers was extracted (-238 wave numbers </= DE </= +192 wave numbers).

摘要

受激发射泵浦（SEP）的两步激光激发方案会使单个水分子在反式甲酰苯胺的两个远程氢键位点之间发生位移。该反应可通过用不同的SEP激发波长选择性激发任一异构体（CO结合或NH结合）来引发。已测量了两个方向上异构化的能量（E）阈值[796波数≤E(CO→NH)≤988波数，750波数≤E(NH→CO)≤988波数]，并提取了CO结合异构体和NH结合异构体之间的能量差DE（-238波数≤DE≤+192波数）。