Suggested Mechanism for the Anomalous Excitation of OH Microwave Emissions from H-II Regions

Details Suggested Mechanism for the Anomalous Excitation of OH Microwave Emissions from H-II Regions Suggested Mechanism for the Anomalous Excitation of OH Microwave Emissions from H-II Regions

May 1966

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1966natur.210..611c&link_type=abstract

Nature, Volume 210, Issue 5036, pp. 611-612 (1966).

Computer Science

19

Scientific paper

STRONG microwave emission lines at 18 cm have recently been reported from a number of sources1-3, the frequencies being close to those of the hyperfine components of the Λ-doublet of the ground state (X 2Π3/2, J = 3/2) as measured in the laboratory4. Λ-doubling is due to coupling between the rotation of the nuclei and the orbital rotation of the electrons, which has a quantum number Λ = 1 in the Π state. The energies differ slightly according to the relative orientation of the two angular momenta. Coupling with the nuclear spin of the proton leads to further hyperfine splitting (Fig. 1). Galactic absorption lines at these frequencies, detected in the past 3 years, have rather broad profiles similar to those of the 14-cm H-emission line; and, except for OH near the galactic centre, the intensities of the hyperfine components are compatible with populations of levels in thermodynamic equilibrium5. The emission lines, by contrast, show a number of remarkable features.

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