Evidence for ultra-fast dissociation of molecular water from resonant Auger spectroscopy
Evidence for ultra-fast dissociation of molecular water from resonant Auger spectroscopy
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DOI：
10.1016/s0009-2614(00)01434-2
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发表时间：
2001-02-02
影响因子：
2.8
通讯作者：
Svensson, S
中科院分区：
文献类型：
--
作者：
Hjelte, I;Piancastelli, MN;Svensson, S
我们提供了Ols - >4a(1)共振连接光激发中分子水的超快速解离的直接证据。核心激发的H2O分子解离成核心激发的O*H和中性H的时间尺度与核心空穴寿命相当，i,e。几飞秒。这一结论是基于共振俄歇研究、定性论证和从头计算。从振动激发的OH片段中识别出与Anger跃迁相关的“热带”，这些热带表现出一种动态行为，定性地遵循多余能量的变化。(C) 2001爱思唯尔科学B，V。版权所有。
We present direct evidence for ultra-fast dissociation of molecular water in connection photo-excitation of the Ols --> 4a(1) resonance. The core-excited H2O molecules are shown to dissociate into core-excited O*H and neutral H on a time scale comparable to the core hole lifetime, i,e. a few femtoseconds. This conclusion is based on a resonant Auger study, qualitative arguments and ab initio calculations. 'Hot bands' connected to Anger transitions from vibrationally excited OH fragments are identified, and these exhibit a dynamical behavior which qualitatively follows the change in excess energy. (C) 2001 Elsevier Science B,V. All rights reserved.