CH分子基态λ-二重态跃迁的微波光谱研究
Microwave spectroscopy of Lambda-doublet transitions in the ground state of CH
摘要：
CH在3.3和0.7 GHz的λ-双重跃迁对精细结构常数和电子-质子质量比的变化异常敏感。我们描述的方法来测量这些转换的频率与Hz级的精度。我们产生了一个脉冲超声束的冷CH的光解CHBr 3，我们测量的微波跃迁频率的分子传播通过平行板传输线谐振器。我们利用分子来绘制出传输线内部的驻波场的振幅和相位。我们调查速度相关的频率偏移，表明它们可以通过仔细的微波脉冲的定时强烈抑制。我们测量的微波跃迁的塞曼和斯塔克效应，并减少系统的位移，由于磁场和电场低于1赫兹。我们还调查了实验中系统不确定性的其他来源。
英文摘要：
The Lambda-doublet transitions in CH at 3.3 and 0.7 GHz are unusually sensitive to variations in the fine-structure constant and the electron-to-proton mass ratio. We describe methods used to measure the frequencies of these transitions with Hz-level accuracy. We produce a pulsed supersonic beam of cold CH by photodissociation of CHBr3, and we measure the microwave transition frequencies as the molecules propagate through a parallel-plate transmission line resonator. We use the molecules to map out the amplitude and phase of the standing wave field inside the transmission line. We investigate velocity-dependent frequency shifts, showing that they can be strongly suppressed through careful timing of the microwave pulses. We measure the Zeeman and Stark effects of the microwave transitions, and reduce systematic shifts due to magnetic and electric fields to below 1 Hz. We also investigate other sources of systematic uncertainty in the experiment.
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