Sub-ppb measurement of a fundamental band rovibrational transition in HD

Fast, A.; Meek, S. A.

doi:10.1103/PhysRevLett.125.023001

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Sub-ppb measurement of a fundamental band rovibrational transition in HD

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Fast, A.
Research Group of Precision Infrared Spectroscopy, MPI for Biophysical Chemistry, Max Planck Society;

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Meek, S. A.
Research Group of Precision Infrared Spectroscopy, MPI for Biophysical Chemistry, Max Planck Society;

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Citation

Fast, A., & Meek, S. A. (2020). Sub-ppb measurement of a fundamental band rovibrational transition in HD. Physical Review Letters, 125(2): 023001. doi:10.1103/PhysRevLett.125.023001.

Cite as: https://hdl.handle.net/21.11116/0000-0006-CB9D-5

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.