Observations of diffuse molecular clouds by millimeter wave absorption.

Details Observations of diffuse molecular clouds by millimeter wave absorption. Observations of diffuse molecular clouds by millimeter wave absorption.

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997crasb.325..605l&link_type=abstract

Comptes Rendus de l'Academie des Sciences, Sér. II, Fasc. b, Tome 325, No. 10, p. 605 - 614

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Molecular Clouds: Mm Radiation

Scientific paper

For sensitivity reasons, absorption spectroscopy was not possible at millimeter wavelengths until recently. While emission measurements need collisional excitation of the molecular levels above the cosmic background temperature, absorption measurements are able to detect molecules in low-density regions. However, large collecting area instruments are required. In diffuse clouds, the HCO+ ion is frequently seen, more easily than the CO molecule. The HCO+ to OH abundance ratio is remarkably constant (0.03 to 0.05). Other species such as H2CO, HCN, HNC, CN, C2H, C2H2, CS, SO, H2S, can now also be studied in diffuse clouds.

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