New Measurements Of H2, D2 And HD

Details New Measurements Of H2, D2 And HD New Measurements Of H2, D2 And HD

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.6214m&link_type=abstract

American Astronomical Society, DPS meeting #38, #62.14; Bulletin of the American Astronomical Society, Vol. 38, p.608

Astronomy and Astrophysics

Astronomy

Scientific paper

In a continuing effort to improve the spectral line parameters and ground state constants for molecular hydrogen and its isotopic variants, the results of new measurements using Off-Axis Integrated Cavity Output Spectroscopy1 are presented. Measurements of positions, density shifts, and line shape parameters for the quadrupole lines of H2 in the 2-0 and 3-0 bands2, D2 in the 2-0 band and dipole lines of HD in the 2-0 band are incorporated with earlier high accuracy measurements3 of these molecules to provide updated sets of electronic ground state constants and line parameters. Measurements were made using narrow line-width tunable lasers in conjunction with an Off-Axis ICOS cell. Optical paths up to 20 kilometers and densities to 1.2 amagats were obtained in a cell of 0.5 meters length.
References:

1. Baer, D.S., J.B. Paul, M. Gupta, and A. O'Keefe (2002) Sensitive absorption measurements in the near-infrared region using off-axis intergrated-cavity-output spectroscopy, Appl. Phys. B 75, 261-265


2. Gupta, M., T. Owano, D.S. Baer, and A. O'Keefe (2006) Quantitative Determination of the Q(1) Quadrupole Hydrogen Absorption in the Near Infrared via Off-Axis ICOS, Chem. Phys. Lett. 418, 11.


3. Mickelson, M.E. (1998) Electronic Ground State Parameters for Molecular Hydrogen, Brown Dwarfs and Extrasolar Planets, ASP Conference Series, 134, 450-454.

This work has been supported in part by NASA Grant NAG5-11966, Los Gatos Research, Inc. and Denison University.

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