Laboratory Detection of FeCO+ (X4Σ-) by Millimeter/Submillimeter Velocity Modulation Spectroscopy

Details Laboratory Detection of FeCO+ (X4Σ-) by Millimeter/Submillimeter Velocity Modulation Spectroscopy Laboratory Detection of FeCO+ (X4Σ-) by Millimeter/Submillimeter Velocity Modulation Spectroscopy

Mar 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apj...657l..61h&link_type=abstract

The Astrophysical Journal, Volume 657, Issue 1, pp. L61-L64.

Astronomy and Astrophysics

Astronomy

1

Astrochemistry, Ism: Molecules, Line: Identification, Methods: Laboratory, Molecular Data, Stars: Agb And Post-Agb

Scientific paper

The millimeter/submillimeter spectrum of the molecular ion FeCO+ (X4Σ-) has been recorded using velocity modulation spectroscopy. The molecular ion was created in an AC discharge of Fe(CO)5 and argon. Twenty-seven rotational transitions, each consisting of four fine-structure components, were measured in the range 198-418 GHz. The data were fit with a case b Hamiltonian, and rotational, spin-rotation, and spin-spin constants were determined. Because of the presence of higher order spin-orbit interactions, probably caused in part by a nearby 4Π excited state, numerous centrifugal distortion terms were needed for the spectral analysis. The value of γs, the third-order spin-rotation constant, was also remarkably large at -72.4 MHz. Rest frequencies for FeCO+ are now available for interstellar and circumstellar searches. This species may be present in molecular clouds, where CO is abundant and gas-phase iron should be in the form of Fe+. Molecular ions such as FeCO+ could be the hidden carriers of metallic elements in such clouds.

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