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Sub-ppb Measurement of a Fundamental Band Rovibrational Transition in HD.
Physical Review Letters ( IF 8.1 ) Pub Date : 2020-07-10 , DOI: 10.1103/physrevlett.125.023001
Arthur Fast 1 , Samuel A Meek 1
Affiliation  

We report a direct measurement of the 1–0 R(0) vibrational transition frequency in ground-state hydrogen deuteride (HD) using infrared-ultraviolet double resonance spectroscopy in a molecular beam. Ground-state molecules are vibrationally excited using a frequency comb referenced continuous-wave infrared laser, and the excited molecules are detected via state-selective ionization with a pulsed ultraviolet laser. We determine an absolute transition frequency of 111 448 815 477(13) kHz. The 0.12 parts-per-billion (ppb) uncertainty is limited primarily by the residual first-order Doppler shift.

中文翻译:

HD基本波段旋转振动过渡的亚ppb测量。

我们报告了1–0的直接测量值 [R0在分子束中使用红外-紫外线双共振光谱法研究基态氘化氢(HD)的振动跃迁频率。基频分子使用频率梳为参考的连续波红外激光振动激发,并通过脉冲紫外激光通过状态选择电离检测被激发的分子。我们确定绝对跃迁频率为111 44​​8 815 477(13)kHz。十亿分之一(ppb)的0.12不确定度主要受残留的一阶多普勒频移限制。
更新日期:2020-07-10
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