The ground state of molecular hydrogen

Details The ground state of molecular hydrogen The ground state of molecular hydrogen

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jmosp.102..265j&link_type=abstract

Journal of Molecular Spectroscopy, Volume 102, Issue 2, p. 265-272.

Astronomy and Astrophysics

Astrophysics

45

Scientific paper

The v = 0-0 quadrupole spectrum of H2 has been recorded using a 0.005-cm-1 resolution Fourier transform spectrometer. The rotational lines S(1) through S(5) are observable in the spectra, in the region 587 to 1447 cm-1. The spectral position for S(0) was also obtained from its v = 1-0 ground-state combination difference. The high accuracy of the H2 measurements has permitted a determination of four rotational constants. These are (in cm-1) B0 = 59.33455(6); D0 = 0.045682(4); H0 = 4.854(12) × 10-5 L0 = -5.41(12) × 10-8. The hydrogen line positions will facilitate studies of structure and dynamics in astrophysical objects exhibiting infrared H2 spectra. The absolute accuracy of frequency calibration over wide spectral ranges was verified using 10-μm CO2 and 3.39-μm CH4 laser frequencies. Standard frequencies for 5-μm CO were found to be high by 12 MHz (3.9 × 10-4 cm-1).

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