光解反应中间体H $_2$的形状共振
Shape resonances in H$_2$ as photolysis reaction intermediates
摘要：
在H $_2$，在H $_2$ S前体分子的光解反应中间体产生的形状共振，测量在半碰撞的方法。在分解成两个基态H原子之前，反应被双光子无多普勒激发到H $_2$的F电子激发态淬灭。对于$J=13,15,17,19$和21，以30 MHz（1.4 mK）的精度观察到寿命在纳米至毫秒范围内的共振。当考虑非绝热和量子电动力学修正时，实验共振位置与理论预测非常吻合。这是第一次在中性原子之间的碰撞中观察到这种效应。从H $_2$分子的势能曲线，现在在很宽的核间距范围内进行了高精度的测试，在$a = 0.2735^{39}_{31}~a_0$处确定了单线态H（1s）+H（1s）散射的s波散射长度。
英文摘要：
Shape resonances in H$_2$, produced as reaction intermediates in the photolysis of H$_2$S precursor molecules, are measured in a half-collision approach. Before desintegrating into two ground state H atoms, the reaction is quenched by two-photon Doppler-free excitation to the F electronically excited state of H$_2$. For $J=13,15,17,19$ and 21, resonances with lifetimes in the range of nano to milliseconds were observed with an accuracy of 30~MHz (1.4~mK). The experimental resonance positions are found to be in excellent agreement with theoretical predictions when nonadiabatic and quantum electrodynamical corrections are included. This is the first time such effects are observed in collisions between neutral atoms. From the potential energy curve of the H$_2$ molecule, now tested at high accuracy over a wide range of internuclear separations, the s-wave scattering length for singlet H(1s)+H(1s) scattering is determined at $a = 0.2735^{39}_{31}~a_0$.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
