Dye Laser Spectroscopy of Hydrogen in the Visible and High-Resolution Spectroscopy of Nitrogen Ion in the Infrared

Details Dye Laser Spectroscopy of Hydrogen in the Visible and High-Resolution Spectroscopy of Nitrogen Ion in the Infrared Dye Laser Spectroscopy of Hydrogen in the Visible and High-Resolution Spectroscopy of Nitrogen Ion in the Infrared

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phdt........67f&link_type=abstract

Thesis (PH.D.)--THE OHIO STATE UNIVERSITY, 1991.Source: Dissertation Abstracts International, Volume: 52-08, Section: B, page: 4

Astronomy and Astrophysics

Astrophysics

6

Visible Spectrum, Nitrogen Ion, Hydrogen

Scientific paper

This dissertation deals with two independent experimental investigations carried out with some of the latest in high precision technology. Spectra of molecular hydrogen and of the ion N_2^+ have been studied due to their astrophysical importance. Molecular hydrogen is abundant in many sources in the universe and the study of N_2^+ ions has interest in the understanding of the charge exchange reactions of the auroral glow. In the case of hydrogen, pressure shifts and collisional narrowing effects have been studied in greater detail than before. In this research, a high resolution ring dye laser has been coupled to a very long path absorption tube with a base length of 22 meters located at the Denison University in Granville, Ohio. Signal averaging periods of several hours, with an absorbing layer of 24 kilometer-atmospheres were required to obtain acceptable measurements. The 4 -0 S(1) line of H_2 was repeatedly measured, and as such, it is believed that the molecular parameters obtained are by far the most reliable ones available at the present time for this important transition of molecular hydrogen. In addition, the 4-0 S(0) density shift has been determined for the first time; likewise, the 5-0 S(1) line of H_2 has been observed in the laboratory for the first time. This study on the 5 -0 S(1) line has given credence to the planetary observation of this line reported recently. For the study of the spectrum of the N _2^+ ion, a special hollow cathode source was constructed and interfaced with the high resolution infrared Fourier Transform spectroscopic facility at the Universite de Paris-Sud in Orsay, France. An optimal set of conditions was established for producing N_2 ^+ molecular emissions. Molecular parameters were determined for four newly investigated Meinel bands. The results were found to be self consistent when combination differences were examined, thus demonstrating the long term stability of this hollow cathode emission source. The slow-scanning inherent in the Fourier transform facility at Orsay requires that such stable conditions be maintained for the emission source.

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