Sub-Doppler frequency metrology in HD for test of fundamental physics

Abstract

Weak transitions in the (2,0) overtone band of the HD molecule at $\lambda =1.38\mu$m were measured in saturated absorption using the technique of noise-immune cavity-enhanced optical heterodyne molecular spectroscopy. Narrow Doppler-free lines were interrogated with a spectroscopy laser locked to a frequency comb laser referenced to an atomic clock to yield transition frequencies [R(1) = $217105181895(20)$ kHz; R(2) = $219042856621(28)$ kHz; R(3) = $220704304951(28)$ kHz] at three orders of magnitude improved accuracy. These benchmark values provide a test of QED in the smallest neutral molecule, and open up an avenue to resolve the proton radius puzzle, as well as constrain putative fifth forces and extra dimensions.

arXiv comment5 pages, 4 figures

References in corpus (10)

• Saturated-absorption cavity ring-down spectroscopy
• The Fundamental Vibration of Molecular Hydrogen
• Probing QED and fundamental constants through laser spectroscopy of vibrational transitions in HD+
• Bounds on fifth forces from precision measurements on molecules
• Toward a determination of the proton-electron mass ratio from the Lamb-dip measurement of HD
• Constraints on extra dimensions from precision molecular spectroscopy
• Complete ${\alpha }^{6}m$ corrections to the ground state of H${}_2$
• Relativistic corrections for the ground electronic state of molecular hydrogen
• Schrödinger equation solved for the hydrogen molecule with unprecedented accuracy
• Electric dipole rovibrational transitions in HD molecule

Cited by in corpus (20)

• Toward a determination of the proton-electron mass ratio from the Lamb-dip measurement of HD
• Rovibrational energy levels of the hydrogen molecule through nonadiabatic perturbation theory
• High-precision methanol spectroscopy with a widely tunable SI-traceable frequency-comb-based mid-infrared QCL
• Lamb-dips and Lamb-peaks in the saturation spectrum of HD
• Nonadiabatic relativistic correction in H${}_2$, D${}_2$, and HD
• Quantum control of molecules for fundamental physics
• Sub-ppb measurement of a fundamental band rovibrational transition in HD
• Ultra-high finesse cavity-enhanced spectroscopy for accurate tests of quantum electrodynamics for molecules
• Precision measurement of the fundamental vibrational frequencies of tritium-bearing hydrogen molecules: T${}_2$, DT, HT
• Hyperfine structure in the HD molecule
• Fano-like resonance due to interference with distant transitions
• Leading-order QED effects in the ground electronic state of molecular hydrogen
• Hyperfine components of all rovibrational quadrupole transitions in the H${}_2$ and D${}_2$ molecules
• Rotational level spacings in HD from vibrational saturation spectroscopy
• Frequency measurements and self-broadening of sub-Doppler transitions in the $v_1+v_3$ band of C${}_2$H${}_2$
• Nonrelativistic energy of tritium-containing hydrogen molecule isotopologues
• A Study of New Physics Searches with Tritium and Similar Molecules
• A Stimulated Raman Loss spectrometer for metrological studies of quadrupole lines of hydrogen isotopologues
• Precise frequencies of H${}_2^{16}$O lines protected for radio astronomy
• Lamb-peak spectrum of the HD (2-0) P(1) line