High-Resolution Electron-Impact Emission Spectrum of H2. I. Cross Sections and Emission Yields 900-1200 Å

Details High-Resolution Electron-Impact Emission Spectrum of H2. I. Cross Sections and Emission Yields 900-1200 Å High-Resolution Electron-Impact Emission Spectrum of H2. I. Cross Sections and Emission Yields 900-1200 Å

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apjs..129..247j&link_type=abstract

The Astrophysical Journal Supplement Series, Volume 129, Issue 1, pp. 247-266.

Astronomy and Astrophysics

Astronomy

28

Methods: Laboratory, Molecular Processes, Ultraviolet: Ism

Scientific paper

High-resolution (Δλ=115 mÅ) emission spectra of molecular hydrogen produced by electron-impact excitation at 100 eV have been obtained in the wavelength range 900-1200 Å. The emission spectra can be assigned to transitions between the X 1Σ+g ground state and the 1sσgnpσu 1Σu and 1sσgnpπu 1Πu Rydberg states. Synthetic rotational line spectra based on the excitation function of Liu et al. and calculated 2pσ B 1Σ+u-X 1Σ+g, 2pπ C 1Πu-X 1Σ+g, 3pσ B' 1Σ+u-X 1Σ+g, and 3pπD 1Πu-X 1Σ+g transition probabilities of Abgrall et al. are generally found to be in good agreement with the experimental spectra in the regions where emissions from 1sσgnpσu (n>=4) and 1sσgnpπu (n>=4) states are negligible. Emission cross sections for D 1Π+u, D' 1Πu, and D'' 1Π-u, B' 1Σ+u, and B'' 1Σ+u states are obtained by measuring the emission intensities from these states relative to those from the B 1Σ+u,C 1Πu, and D 1Π-u states. A high- resolution EUV calibration technique is established. At 100 eV the emission cross sections of the D 1Πu, D' 1Πu, D'' 1Πu, B' 1Σ+u, and B'' 1Σ+u states are measured to be (2.8+/-0.4)×10-18, (6.3+/-1.3)×10-19, (5.9+/-1.7)×10-20, (2.1+/-0.3)×10-18, and (1.6+/-0.4)×10-19 cm2, respectively. In addition, the vibrational emission cross sections have been compared to the estimated excitation cross sections to obtain the predissociation yields for selected vibrational levels of the D 1Π+u, D' 1Π+u and D'' 1Π+u states. The B' 1Σ+u state is inferred to have very significant excitation into the H(1s)+H(2p,2s) dissociative continuum.

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