Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990phdt........89c&link_type=abstract
Thesis (PH.D.)--UNIVERSITY OF CALIFORNIA, BERKELEY, 1990.Source: Dissertation Abstracts International, Volume: 52-04, Section: B
Astronomy and Astrophysics
Astrophysics
Laser Magnetic Resonance, Interstellar Chemistry
Scientific paper
High resolution infrared laser spectroscopy has been used to characterize carbon species of astrophysical interest. Using far-infrared laser magnetic resonance spectroscopy, we directly observed the electric dipole -forbidden fine structure transition J = { ^3over 2}>=ts {^1over 2} in the ^2P ground state of C^{+}, and have measured improved spectra for the similar transitions in the ^3P ground state of the neutral C atom. In conjunction with this work, we also measured the J = 2 >=ts 1 transition in the ^3P ground state of N^ {+}. Analysis of these data yielded precise values for the fine structure intervals, hyperfine interactions, and magnetic field constants. The work tested ab initio calculations of high order effects in atomic spectra, as well as providing accurate and precise rest frequencies required for the study of these species in the interstellar medium. These result have already been utilized in astrophysical studies of the chemistry, dynamics and structures of a number of diverse interstellar environments. A new technique for obtaining direct infrared absorption spectra of clusters of refractory elements has been developed. Laser vaporization of any solid substrate and subsequent supersonic expansion in a carrier gas results in rotationally cold (T_{rm rot } ~ 15K) cluster molecules, which may then be proved by a sensitive infrared laser spectrometer. We have used this technique to measure rovibrational spectra of the molecules C_3, C _5, and C_7. Our results agree well with theory, and should facilitate further study of these species in astrophysical sources.
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