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The FeH molecule at 4 K
Dendramis, A.; van Zee, R. J.; Weltner, W., Jr.
AA(Florida, University, Gainesville, Fla.), AB(Florida, University, Gainesville, Fla.), AC(Florida, University, Gainesville, Fla.)
Astrophysical Journal, Part 1, vol. 231, July 15, 1979, p. 632-636. (ApJ Homepage)
Publication Date:
Atomic and Molecular Physics
NASA/STI Keywords:
Diatomic Molecules, Electronic Spectra, Ground State, Infrared Spectroscopy, Iron Compounds, Metal Hydrides, Vibrational Spectra, Argon, Deuterides, Electromagnetic Absorption, Solidified Gases, Transition Probabilities
Bibliographic Code:


FeH and FeD molecules have been trapped in solid argon at 4 K. From the observed infrared frequencies, corrected for small solid-state effects, the gas-phase vibrational properties are predicted to be omegae double prime = 1764 (10) and omegae xe = 46 (5) kaysers. Dzero is found to be 2.0 eV from the Birge-Sponer approximation, but is more likely near 1.7 eV on the basis of the application of that approximation to other diatomic hydrides. Five weak electronic transitions (suggesting low gf values) observed in absorption in the 4000-5000-A region are probably counterparts of the blue and green band systems in the gas-phase laboratory and stellar spectra. The strongest band occurs at 4190 A, suggesting that the 4288-A band studied by Heimer (1936) be reinvestigated. Failure to observe an ESR spectrum of FeH in the solid is interpreted as support for an orbitally degenerate ground electronic state, in agreement with the theoretically derived 6 delta ground state.

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