Radiative trapping and hyperfine structure: HCN (11)

Details Radiative trapping and hyperfine structure: HCN (11) Radiative trapping and hyperfine structure: HCN (11)

Aug 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974stin...7520199k&link_type=abstract

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Computer Science

Cyanides, Hyperfine Structure, Interstellar Matter, Iodine Compounds, Lasers, Molecular Energy Levels, Neodymium, Ultraviolet Radiation

Scientific paper

The anomalous weakness of the F = 1 to 1 hyperfine component in the J = 1 to 0 emission of interstellar HCN can be caused by radiative trapping in the J = 2 to 1 lines. The anomaly is readily produced if the J = 1 levels are populated largely by collisional excitation from J = 0 to J = 2 followed by radiative decay to J = 1 with the J = 2 to 1 lines optically thick. Regions where the anomaly is found probably have H2 density less than 10000/cc and optical depths in the J = 1 to 0 lines greater than 100.

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