The relaxation from linear to triangular Ag3 probed by femtosecond resonant two-photon ionization
The relaxation from linear to triangular Ag3 probed by femtosecond resonant two-photon ionization
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飞秒共振双光子电离探测Ag3从线性到三角形的弛豫
DOI：
10.1063/1.479382
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发表时间：
1999
影响因子：
4.4
通讯作者：
R. Berry
中科院分区：
文献类型：
--
作者：
T. Leisner;Š. Vajda;S. Wolf;L. Wöste;R. Berry
我们提出了对中性、质量选择的 Ag3 分子基态超快动力学的扩展 NeNePo（负到中性到正）测量。中性分子中的振动波包是通过超短激光脉冲将多余的电子与相应的质量选择的阴离子光分离而产生的。在选定的时间延迟后，通过光电离来探测随后的分子重排。作为对我们之前对此过程的研究的补充，我们现在在探测步骤中通过共振态使用双光子光电离。这里，使用束缚-束缚激发到众所周知的状态，然后进行单光子电离，而不是进入离子连续体的非共振束缚/自由跃迁。使用波长接近 370 nm 的辐射进行共振电离，我们观察到最初线性 Ag3 的快速弯曲运动，随后是超快分子内振动能量重新分布，可解释为分子内碰撞过程。信号...
We present extended NeNePo (negative to neutral to positive) measurements on the ultrafast dynamics in the ground state of neutral, mass-selected Ag3 molecules. A vibrational wave packet in the neutral molecule is created with an ultrashort laser pulse by photodetachment of the excess electron from the corresponding mass-selected anion. The subsequent molecular rearrangement is probed by photoionization after a selected time delay. Complementary to our previous investigations of this process, we now use two-photon photoionization via a resonant state in the probe step. Here, a bound–bound excitation to a well-known state followed by one-photon ionization is used instead of the nonresonant bound/free transition into the ionic continuum. Using radiation with wavelengths near 370 nm for resonant ionization, we observe a fast bending motion of the initially linear Ag3, followed by an ultrafast intramolecular vibrational energy redistribution, interpretable as an intramolecular collision process. The signal sh...