High-Resolution Electron-Impact Study of the Far-Ultraviolet Emission Spectrum of Molecular Hydrogen

Details High-Resolution Electron-Impact Study of the Far-Ultraviolet Emission Spectrum of Molecular Hydrogen High-Resolution Electron-Impact Study of the Far-Ultraviolet Emission Spectrum of Molecular Hydrogen

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apjs..101..375l&link_type=abstract

Astrophysical Journal Supplement v.101, p.375

Astronomy and Astrophysics

Astronomy

51

Methods: Laboratory, Molecular Processes, Ultraviolet: Ism

Scientific paper

The emission spectrum of molecular produced by electron-impact excitation at 100 eV has been measured in the wavelength range 1140-1690 Å. High-resolution, optically thin spectra (Δλ = 0.136 Å) of the far-ultraviolet (FUV) Lyman and Werner band systems have been obtained with a newly constructed 3 m spectrometer. Synthetic spectral intensities based on the transition probabilities calculated by Abgrall et al. are in very good agreement with experimentally observed intensities. Previous modeling that utilized Allison & Dalgarno band transition probabilities with Hönl-London factors breaks down when the transition moment has significant j dependence or when ro-vibrational coupling is significant. Ro-vibrational perturbation between υ = 14 of the B1Σ+υ state and υ = 3 of the C1Πυ state and the rotational dependence of the transition moment in the (6, 12) and (7, 13) bands of the Lyman system are examined. Complete high-resolution experimental reference FUV spectra, together with the model synthetic spectra based on the Abgrall transition probabilities, are presented. An improved calibration standard is obtained, and an accurate calibration of the 3 m spectrometer has been achieved.

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