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Measurement of Doppler effects in a cryogenic buffer-gas cell

Ayami Hiramoto1, Masaaki Baba2,3, Katsunari Enomoto4, Kana Iwakuni5, Susumu Kuma6, Yuiki Takahashi7, Reo Tobaru1, and Yuki Miyamoto1,*

  • 1Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan
  • 2Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
  • 3Molecular Photoscience Research Center, Kobe University, Kobe 657-8501, Japan
  • 4Department of Physics, University of Toyama, Toyama 930-8555, Japan
  • 5Institute for Laser Science, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan
  • 6Atomic, Molecular and Optical Physics Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
  • 7Division of Physics, Mathematics, and Astronomy, California Institute of Technology, Pasadena, California 91125, USA

  • *miyamo-y@cc.okayama-u.ac.jp
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Phys. Rev. A 107, 043114 – Published 13 April, 2023

DOI: https://doi.org/10.1103/PhysRevA.107.043114

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 Ã2Π(0,0,0)−X̃2Σ+(0,0,0) band of calcium monohydroxide (CaOH). CaOH molecules were produced by laser ablation in a copper cell and cooled to ∼5K using helium buffer gas. We probed the Doppler effects in a buffer-gas cell by injecting counterpropagating 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.

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Phys. Rev. A 107, 043114– Published 13 April, 2023
  • Received 7 November 2022
  • Accepted 22 March 2023
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