Measurement of Doppler effects in cryogenic buffer-gas cell

Abstract

Buffer-gas cooling is a universal cooling technique for molecules and used for various purposes. One of its applications is using molecules inside a buffer-gas cell for low-temperature spectroscopy. Although a high-intensity signal is expected in the cell, complex molecular dynamics is a drawback for precise spectroscopy. In this study, we performed high-resolution absorption spectroscopy of low-J transitions in the ${\tilde{A}}^2\Pi (0,0,0)-{\tilde{X}}^2{\Sigma }^{+}(0,0,0)$ band of calcium monohydroxide (CaOH). CaOH molecules were produced by laser ablation in a copper cell and cooled to $\sim$5\,K using helium buffer gas. We probed the Doppler effects in a buffer-gas cell by injecting counter-propagating lasers inside the cell. The time evolutions of the Doppler width and shift were simulated using a dedicated Monte Carlo simulation and compared with data.

5 pages, 5 figures

References in corpus (7)

• Magneto-Optical Trapping and Sub-Doppler Cooling of a Polyatomic Molecule
• Functionalizing Aromatic Compounds with Optical Cycling Centers
• High Sensitivity Microwave Spectroscopy in a Cryogenic Buffer Gas Cell
• Doppler cooling of buffer-gas-cooled Barium monofluoride molecules
• Simulation of Cryogenic Buffer Gas Beams
• Low-temperature spectroscopy of the ${}^{12}$C${}_2$H${}_2$ (${\upsilon }_1+{\upsilon }_3$) band in a helium buffer gas
• Low-$J$ transitions in ${\tilde{A}}^2\Pi (0,0,0)-{\tilde{X}}^2{\Sigma }^{+}(0,0,0)$ band of buffer-gas-cooled CaOH

Cited by in corpus (3)

• Absorption spectroscopy for laser cooling and high-fidelity detection of barium monofluoride molecules
• High-resolution spectroscopy of barium monofluoride: Odd isotopologues, hyperfine structure and isotope shifts
• Magnetic hyperfine structure constants of ${}^{137}$BaF in the ${}^2{\Pi }_{1/2}$ and ${}^2{\Pi }_{3/2}$ excited states