Qiang Junjie, Zhou Lianrong, Lu Peifen, Lin Kang, Ma Yongzhe, Pan Shengzhe, Lu Chenxu, Jiang Wenyu, Sun Fenghao, Zhang Wenbin, Li Hui, Gong Xiaochun, Averbukh Ilya Sh, Prior Yehiam, Schouder Constant A, Stapelfeldt Henrik, Cherepanov Igor N, Lemeshko Mikhail, Jäger Wolfgang, Wu Jian
State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China.
AMOS and Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot 76100, Israel.
Phys Rev Lett. 2022 Jun 17;128(24):243201. doi: 10.1103/PhysRevLett.128.243201.
Rotational dynamics of D_{2} molecules inside helium nanodroplets is induced by a moderately intense femtosecond pump pulse and measured as a function of time by recording the yield of HeD^{+} ions, created through strong-field dissociative ionization with a delayed femtosecond probe pulse. The yield oscillates with a period of 185 fs, reflecting field-free rotational wave packet dynamics, and the oscillation persists for more than 500 periods. Within the experimental uncertainty, the rotational constant B_{He} of the in-droplet D_{2} molecule, determined by Fourier analysis, is the same as B_{gas} for an isolated D_{2} molecule. Our observations show that the D_{2} molecules inside helium nanodroplets essentially rotate as free D_{2} molecules.
氦纳米液滴内部D₂分子的旋转动力学由中等强度的飞秒泵浦脉冲诱导产生，并通过记录由延迟飞秒探测脉冲通过强场解离电离产生的HeD⁺离子产率来作为时间的函数进行测量。产率以185飞秒的周期振荡，反映了无场旋转波包动力学，并且该振荡持续超过500个周期。在实验不确定性范围内，通过傅里叶分析确定的液滴内D₂分子的旋转常数Bₕₑ与孤立D₂分子的B₍₉ₐₛ₎相同。我们的观察结果表明，氦纳米液滴内部的D₂分子基本上像自由D₂分子一样旋转。
