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arXiv · 2005.03083

Lamb-peak spectrum of the HD (2-0) P(1) line

M. L. Diouf·F. M. J. Cozijn·K. -F. Lai·E. J. Salumbides·W. Ubachs
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Abstract

A saturation spectroscopy measurement of the P(1) line of the ($2-0$) band in HD is performed in a sensitive cavity-enhanced optical setup involving frequency comb calibration. The spectral signature is that of a Lamb-peak, in agreement with a density-matrix model description involving 9 hyperfine components and 16 crossover resonances of $\Lambda$-type. Comparison of the experimental spectra with the simulations yields a rovibrational transition frequency at 209,784,242,007 (20) kHz. Agreement is found with a first principles calculation in the framework of non-adiabatic quantum electrodynamics within 2$\sigma$, where the combined uncertainty is fully determined by theory.

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M. L. Diouf, F. M. J. Cozijn, K. -F. Lai, E. J. Salumbides, W. Ubachs. 2020-05-06. Lamb-peak spectrum of the HD (2-0) P(1) line. https://arxiv.org/abs/2005.03083

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