Abstract
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.
Highlights
Precise measurements of vibrational transition frequencies in the isotopologues of molecular hydrogen can provide a sensitive probe of fundamental physics
We demonstrate a technique that avoids both of these issues by measuring the molecules in the lowdensity, cold environment of a supersonic molecular beam
Ground-state hydrogen deuteride (HD) molecules in the beam are vibrationally excited using a tunable continuouswave narrow-linewidth (
Summary
Precise measurements of vibrational transition frequencies in the isotopologues of molecular hydrogen can provide a sensitive probe of fundamental physics. Based on the measured infrared spectra, we are able to determine the absolute frequency of the 1–0 Rð0Þ transition with an uncertainty of 13 kHz or 0.12 ppb fractional uncertainty.
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