Rest Frequencies for Alkaline Earth Hydroxide Radicals (X 2 Sigma +)

Details Rest Frequencies for Alkaline Earth Hydroxide Radicals (X 2 Sigma +) Rest Frequencies for Alkaline Earth Hydroxide Radicals (X 2 Sigma +)

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apjs..102..425z&link_type=abstract

Astrophysical Journal Supplement v.102, p.425

Astronomy and Astrophysics

Astronomy

8

Line: Identification, Methods: Laboratory, Molecular Data, Techniques: Spectroscopic

Scientific paper

Rest frequencies for the pure rotational transitions of the alkaline earth hydroxide radicals MgOH, CaOH, SrOH, and BaOH are presented. These data were obtained using millimeter/submillimeter direct absorption spectroscopy in the range 100-400 GHz. The hydroxide molecules, which all have 2Σ+ ground electronic states, were created by the reaction of hydrogen peroxide and metal vapor, produced in a Broida-type oven. Transitions arising in the ground (000) state as well as excited vibrational modes (01 10), (0200), (0220), and (100), were recorded. Fine-structure splittings were resolved in every transition. The data were analyzed using a 2Σ Hamiltonian, and rotational, fine-structure, and 1-type doubling constants were determined for the radicals. These measurements will enable the identification of the alkaline earth hydroxide species in the interstellar medium.

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