Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976phdt........12c&link_type=abstract
Ph.D. Thesis California Univ., Berkeley.
Astronomy and Astrophysics
Astronomy
1
Ammonia, Cosmic Dust, Interstellar Matter, Microwave Amplifiers, Radio Astronomy, Traveling Wave Masers, Extremely High Frequencies, Interferometry, Kinetic Theory, Radiometers, Ruby, Stellar Evolution
Scientific paper
Single crystal pink ruby is the active material in traveling wave masers which were developed and interfaced with spectral line receivers to study the transitions, occurrences, and emission spectra of ammonia in dark instellar clouds. The ammonia transitions examined arise from the (1,1) and (2,2) metastable inversion levels. The observed hyperfine structure intensities of the (1,1) transition are used to determine line opacities, and the (2,2) observations lead to derived rotation temperatures which closely reflect kinetic temperatures. Column densities and other parameters are compared with those of formaldehyde and carbon monoxide. Ammonia is generally found to be present in the same regions of space as H2CO and CO. The NH3 emission does not exhibit any correlation with the presence of near infrared sources, and possible reasons for this are discussed.
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