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

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.

References in corpus (8)

• Sub-Doppler frequency metrology in HD for test of fundamental physics
• Toward a determination of the proton-electron mass ratio from the Lamb-dip measurement of HD
• Benchmarking theory with an improved measurement of the ionization and dissociation energies of H${}_2$
• Rovibrational energy levels of the hydrogen molecule through nonadiabatic perturbation theory
• Nonadiabatic QED correction to the dissociation energy of the hydrogen molecule
• Dissociation energy of the hydrogen molecule at 10${}^{-9}$ accuracy
• Sub-ppb measurement of a fundamental band rovibrational transition in HD
• Electric dipole rovibrational transitions in HD molecule