The Millimeter and Sub-millimeter Rotational Spectrum of the KS Radical (X 2 pi i)

Details The Millimeter and Sub-millimeter Rotational Spectrum of the KS Radical (X 2 pi i) The Millimeter and Sub-millimeter Rotational Spectrum of the KS Radical (X 2 pi i)

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...495l.119x&link_type=abstract

Astrophysical Journal Letters v.495, p.L119

Astronomy and Astrophysics

Astronomy

3

Ism: Molecules, Line: Identification, Molecular Data

Scientific paper

The pure rotational spectrum of the KS radical (X 2 Pi i) has been recorded using millimeter/submillimeter direct absorption techniques in the range 248-409 GHz. This work is the first laboratory detection of KS by any method. The species was created by the reaction of potassium vapor and CS 2 under DC discharge conditions. Twenty-three rotational transitions were measured in both spin-orbit components, Omega =1/2 and Omega =3/2 ; lambda-doubling splittings were resolved in each substate. These data were analyzed with a 2 Pi case (a) Hamiltonian, and the rotational, spin-orbit, and lambda-doubling parameters have been determined. The lambda-doubling p-constant was found to be anomalously large, indicating the presence of a 2 Sigma state that is close by. The detection of KCl in the circumstellar shell of IRC +10216 indicates that potassium is present in the gas phase and may be in the form of other species such as KS.

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