Abstract
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. Twentyseven 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 4II 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.
Original language | English (US) |
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Pages (from-to) | L61-L64 |
Journal | Astrophysical Journal |
Volume | 657 |
Issue number | 1 II |
DOIs | |
State | Published - Mar 1 2007 |
Keywords
- Astrochemistry
- ISM: molecules
- Line: identification
- Methods: laboratory
- Molecular data
- Stars: AGB and post-AGB
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science