Nonadiabatic effects on the positions and lifetimes of the low-lying rovibrational levels of the GK 1Σ +g and H 1Σ +g states of H2,Physical Chemistry Chemical Physics

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Nonadiabatic effects on the positions and lifetimes of the low-lying rovibrational levels of the GK 1Σ +g and H 1Σ +g states of H2
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2018-10-17 00:00:00 , DOI: 10.1039/c8cp05233f
Nicolas Hölsch _{1,

2,

3} , Maximilian Beyer _{1,

2,

3} , Frédéric Merkt _{1,

2,

3}

Affiliation

The term values of rovibrational levels of the GK ¹Σ⁺_g and H ¹Σ⁺_g states of H₂ have been measured with absolute and relative accuracies down to 10⁻⁴ cm⁻¹ (≈3 MHz) and 10⁻⁶ cm⁻¹ (≈30 kHz), respectively, by measuring transitions to long-lived high-n Rydberg states using single-mode cw laser radiation and a collimated supersonic beam of cold H₂ molecules. The term values are compared with those determined in earlier experimental and theoretical investigations and the comparison points at discrepancies and a need for improved theoretical treatments of nonadiabatic, relativistic and radiative corrections for these states. The lifetimes of several low-lying rovibrational levels of the GK, H and I^{+ 1}Π_g states have been determined in pump–probe experiments. These lifetimes reveal a significant dependence on the electronic, vibrational and rotational excitation and also deviate from results obtained in earlier experimental and theoretical investigations.

中文翻译：

对GK的低洼振转水平的位置和寿命非绝热效果¹ Σ ⁺_克和H ¹ Σ ⁺_克h的状态₂

该GK的振转电平的术语值¹ Σ ⁺_克和H ¹ Σ ⁺_克h的状态₂已经与绝对和相对精度测定至10 ^-4厘米^-1（≈3兆赫）和10 ^-6厘米^{- 1}（≈30kHz），分别通过使用单模连续激光辐射和冷H ₂的准直超声束测量到长寿命高n Rydberg态的跃迁来实现分子。将术语值与早期实验和理论研究中确定的值进行比较，并比较差异处的比较点，并需要对这些状态的非绝热，相对论和辐射校正进行改进的理论处理。的GK，H和I的几个低洼振转电平的寿命^{+ 1个}Π_克州已经在泵浦-探测实验中已经确定。这些寿命显示出对电子，振动和旋转激励的显着依赖，并且也偏离了早期实验和理论研究中获得的结果。

更新日期：2018-10-17

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