脉冲排列$\rm I_2$分子的超精细结构诱导去极化
Hyperfine-Structure-Induced Depolarization of Impulsively Aligned $\rm I_2$ Molecules
摘要：
使用中等强度的$450$ fs激光脉冲在气相$\rm{I_2}$分子中产生旋转波包。随后的随时间变化的对齐，测量库仑爆炸成像与延迟的探测脉冲，表现出特征的复苏结构预期的旋转波包，但也是一个复杂的非周期性的子结构和减少平均对齐之前没有观察到。量子力学模型将这种现象归因于转动角动量和核自旋之间通过电四极相互作用的耦合。计算的取向轨迹与实验结果吻合得很好。
英文摘要：
A moderately intense $450$ fs laser pulse is used to create rotational wave packets in gas phase $\rm{I_2}$ molecules. The ensuing time-dependent alignment, measured by Coulomb explosion imaging with a delayed probe pulse, exhibits the characteristic revival structures expected for rotational wave packets but also a complex non-periodic substructure and decreasing mean alignment not observed before. A quantum mechanical model attributes the phenomena to coupling between the rotational angular momenta and the nuclear spins through the electric quadrupole interaction. The calculated alignment trace agrees very well with the experimental results.
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