Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990phdt.......206b&link_type=abstract
Thesis (PH.D.)--UNIVERSITY OF COLORADO AT BOULDER, 1990.Source: Dissertation Abstracts International, Volume: 52-01, Section: B,
Astronomy and Astrophysics
Astrophysics
Chromium Hydride, Iron Hydride, Cobalt Hydride, Copper Hydride
Scientific paper
The transition metal hydrides are important in studies of molecular bonding, catalysis, ab initio molecular theory, and in astrophysics. The ground state rotational structure of the transition metal hydrides CuH, CrH, FeH, and CoH has been examined by two different far-infrared techniques: coherent tunable spectroscopy and laser magnetic resonance. The analysis of CuH (X^1Sigma ^+) was straightforward, and the rotational constants B, D, and H, and transition frequencies were determined to high precision. The analyses of CrH, CoH, and FeH were progressively more difficult. A complete least-squares fit of 468 CrH X^6Sigma magnetic resonance lines has yielded accurate g -factors and rotational molecular constants, including a much more accurate proton hyperfine splitting constant than was previously known. The analysis of 500 magnetic resonance lines from CoH allowed calculation of the magnetic g-factors, which confirm that the ground state is ^3Phi _4. Although the analysis also revealed perturbations of the ground electronic state by other low -lying electronic states, it was still possible to determine the molecular parameters. The results from the study of CuH, CrH, and CoH will be useful especially to theorists testing and refining ab initio calculations for the transition metal hydrides. The rotational transition frequencies of FeH in the ^4Delta electronic state were determined by magnetic resonance experiments. The ground rotational state transition frequency was determined to be 1 411 092.7 MHz. The precision of this frequency permits the radio-astronomical search for FeH in intersteller gas clouds. This work provides further evidence that the ground state of FeH is indeed ^4Delta , among the many likely choices arising from the open d-shell of iron.
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