Laboratory of Physical Chemistry, ETH Zurich, CH-8093 Zurich, Switzerland.
J Chem Phys. 2018 Oct 21;149(15):154302. doi: 10.1063/1.5051089.
The term values of the rotational levels of the first excited vibrational state of the electronic ground state of with a rotational quantum number ≤ 13 have been determined with an accuracy of 1.2 × 10 cm (∼35 MHz) by multichannel-quantum-defect-theory-assisted Rydberg spectroscopy of metastable He. Comparison of the experimental term values with the most accurate results for available in the literature [W.-C. Tung, M. Pavanello, and L. Adamowicz, J. Chem. Phys. , 104309 (2012)] reveals inconsistencies between the theoretical and experimental results that increase with increasing rotational quantum numbers. The fundamental vibrational wavenumber of was determined to be 1628.3832(12) cm by fitting effective molecular constants to the obtained term values.
通过氦的亚稳态多通道量子亏损理论辅助的里德堡光谱学，我们以 1.2×10^-2cm（约 35MHz）的精度确定了电子基态第一激发振动态的转动能级的项值，其中转动量子数 ≤ 13。将实验项值与文献中可获得的最准确的 [W.-C. Tung、M. Pavanello 和 L. Adamowicz，J. Chem. Phys. ，104309（2012）] 对于 的结果进行比较，发现理论和实验结果之间存在不一致之处，并且随着转动量子数的增加而增加。通过将有效分子常数拟合到所得到的项值中，我们确定 的基本振动波数为 1628.3832（12）cm。
