液体水的亚秒亚秒探针X射线光谱
Shuai Li1, Lixin Lu2, Swarnendu Bhattacharyya3
1Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL, USA.
概括
真正的X射线/探头实验揭示了水中的超快电子动态. 这项研究证明了微秒电子反应,排除了核运动,并澄清了光谱特征.
科学领域:
- 物理化学
- 超快速光谱
- 关于X射线科学
背景情况:
- 实时观察电子动态需要一秒钟/一秒钟探头实验.
- 真正的attosecond/attosecond探头实验在技术上具有挑战性.
- 之前的研究常常将秒可见和秒极紫外线脉冲与理论模型相结合.
研究的目的:
- 在液体水中对价值电离的电子反应进行研究,使用同步的X射线脉冲对.
- 为了研究超快的动力学,实现真正的attosecond/attosecond探头实验.
- 为了阐明液态水电离中的光谱特征的起源.
主要方法:
- 使用X射线自由电子激光器的一对同步的X射线脉冲.
- 使用所有X射线的瞬时吸收光谱 (AX-ATAS).
- 在液态水中对价电离后分析电子反应.
主要成果:
- 观察到的AX- ATAS反应仅限于女性秒以下的时间范围.
- 证明在这个时间框架内没有原子运动.
- 实验证实,X射线辐射频谱中的1b1分裂是由于动态而不是结构变化.
结论:
- 在液态水中对电离的初始反应由微秒电子动力学决定.
- 核运动 (原子运动) 在这个超快的时间尺度上不会影响观察到的电子反应.
- 1b1光谱特征是一种动态效应,解决了水在环境条件下结构的模两可.
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