EF ^1 π_g^+ - X^1 π_g^+系统中H_2高转动态的无多普勒双光子laser光谱研究
Precision spectroscopy of high rotational states in H_2 investigated by Doppler-free two-photon laser spectroscopy in the EF^1Σ_g^+ - X^1Σ_g^+ system
摘要：
最近报道了对分子氢的EF^1 π_g^+ - X^1 π_g^+系统的高精度光谱研究，获得了关于H_2分子的X^1 π_g ^+基态中一系列转动量子态的QED和相对论效应的信息[E. J. Salumbides et al.，物理修订信函107，043005（2011）]。本文件提出了一个更详细的描述的方法和结果。此外，本文还通过无多普勒双光子光谱技术将EF^1 ~+^_g态的能级结构扩展到高激发振转能级，为进一步研究奠定了基础。根据基态振动能级之间和三个转动分支（O、Q和S分支）之间的组合差异，可以明确地对激发的EF^1 ~+^_g能级进行归属，包括高振动和转动量子数。对于更高的EF^1 <$^+_g能级，在没有组合差异的情况下，使用多通道量子亏损方法进行了计算，适用于高达J=19的广泛类别的振动和转动能级。这些预测被用于指定高J EF水平，并被发现在5 cm^-1范围内是准确的。
英文摘要：
Recently a high precision spectroscopic investigation of the EF^1Σ_g^+ - X^1Σ_g^+ system of molecular hydrogen was reported yielding information on QED and relativistic effects in a sequence of rotational quantum states in the X^1Σ^+_g$ ground state of the H_2 molecule [E.J. Salumbides et al., Phys. Rev. Lett. 107, 043005 (2011)]. The present paper presents a more detailed description of the methods and results. Furthermore, the paper serves as a stepping stone towards a continuation of the previous study by extending the known level structure of the EF^1Σ^+_g state to highly excited rovibrational levels through Doppler-free two photon spectroscopy. Based on combination differences between vibrational levels in the ground state, and between three rotational branches (O, Q and S branches) assignments of excited EF^1Σ^+_g levels, involving high vibrational and rotational quantum numbers, can be unambiguously made. For the higher EF^1Σ^+_g levels, where no combination differences are available, calculations were performed using the multi-channel quantum defect method, for a broad class of vibrational and rotational levels up to J=19. These predictions were used for assigning high-J EF-levels and are found to be accurate within 5 cm^-1.
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