Glass-type hydrogen and deuterium absorption cells developed for d/h ratio measurements in the martian atmosphere

Takuya D. Kawahara, S. Okano, T. Abe, H. Fukunishi, K. Ito

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Hydrogen and deuterium absorption cells of a new glass type have been developed for the DyH ratio measurements on the Japanese Mars mission PLANET-B. The H/D cells work as narrow-band rejection filters for the H/D Lyman-a line, respectively, when the H or D atoms are produced at a heated filament inside the cells. The absorption profiles of the cells were successfully measured with a highresolution vacuum ultraviolet spectrometer with a wavelength resolution of 6.6 3 1024 nm. The derived optical thickness was found to be ∼7 and ∼14 for the hydrogen and deuterium cells, respectively. It was also found that the derived temperature of atomic gas ranges between the temperature of the cell wall and that of the heated filament, and it increases with increasing filament temperature. The measured profiles showed that the absorption efficiencies of the developed absorption cells are sufficient to observe the DyH ratios of the Martian atmosphere.

Original languageEnglish
Pages (from-to)2229-2237
Number of pages9
JournalApplied optics
Volume36
Issue number10
DOIs
Publication statusPublished - 1997 Apr 1

Keywords

  • Absorption cell
  • Mars
  • Profile measurement

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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