Direct evidence of the dominant role of multiphoton permanent-dipole transitions in strong-field dissociation of NO2+
Direct evidence of the dominant role of multiphoton permanent-dipole transitions in strong-field dissociation of NO2+
复制标题
多光子永久偶极跃迁在 NO2 强场解离中起主导作用的直接证据
DOI：
10.1103/physreva.105.043101
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发表时间：
2022
影响因子：
2.9
通讯作者：
Ben-Itzhak, I.
中科院分区：
文献类型：
--
作者：
Jochim, Bethany;Zohrabi, M.;Gaire, B.;Anis, F.;Uhlíková, Tereza;Carnes, K. D.;Wells, E.;Esry, B. D.;Ben-Itzhak, I.
研究了亚稳离子束靶的激光诱导解离，着重研究了分子在高峰激光强度下平行于极化方向的断裂对解离的显著贡献。我们的实验结果和含时薛定谔方程的计算表明，与通常认为的电子跃迁总是占上风的直觉相反，这种高度对齐的解离背后的主导过程是一个只涉及电子基态并导致其振动连续的多光子永久偶极跃迁。因此，通常应该考虑强场永久偶极跃迁，因为它们可能在其他异核分子中发挥重要作用。此外，它们的作用只会在更长的波长上变得越来越重要，这是超快激光研究的一个趋势。
We study laser-induced dissociation of a metastableion-beam target into, focusing on the prominent contribution by molecules breaking parallel to the polarization at high peak laser intensity. Our experimental results and time-dependent Schrödinger equation calculations show that, contrary to commonly held intuition that electronic transitions always prevail, the dominant process underlying this highly aligned dissociation is a multiphoton permanent-dipole transition involving only the electronic ground state and leading to its vibrational continuum. Strong-field permanent-dipole transitions should thus be considered generally, as they may play a significant role in other heteronuclear molecules. Moreover, their role should only grow in importance for longer wavelengths, a trending direction in ultrafast laser studies.