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Title:
Rotational frequencies of transition metal hydrides for astrophysical searches in the far-infrared
Authors:
Brown, John M.; Beaton, Stuart P.; Evenson, Kenneth M.
Affiliation:
AA(Oxford Univ., United Kingdom), AB(NIST, Time and Frequency Div., Boulder, CO), AC(NIST, Time and Frequency Div., Boulder, CO)
Publication:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 414, no. 2, p. L125-L127. (ApJL Homepage)
Publication Date:
09/1993
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Electron Transitions, Far Infrared Radiation, Infrared Astronomy, Interstellar Matter, Metal Hydrides, Molecular Rotation, Ground State, Infrared Spectra, Magnetic Resonance, Molecular Energy Levels
DOI:
10.1086/187012
Bibliographic Code:
1993ApJ...414L.125B

Abstract

Accurate frequencies for the lowest rotational transitions of five transition metal hydrides (CrH, FeH, CoH, NiH, and CuH) in their ground electronic states are reported to help the identification of these species in astrophysical sources from their far-infrared spectra. Accurate frequencies are determined in two ways: for CuH, by calculation from rotational constants determined from higher J transitions with an accuracy of 190 kHz; for the other species, by extrapolation to zero magnetic field from laser magnetic resonance spectra with an accuracy of 0.7 MHz.

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