Molecular probes of the cosmic background radiation.

Details Molecular probes of the cosmic background radiation. Molecular probes of the cosmic background radiation.

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988msngr..53...43c&link_type=abstract

The Messenger, vol. 53, p. 43-45

Physics

Background Radiation:Interstellar Molecules, Interstellar Molecules:Background Radiation

Scientific paper

In the late 1930's observers at the Mount Wilson observatory using the 100-inch telescope and the Coude Spectrograph discovered absorption lines of the interstellar molecules CH, CH', and CN. In the case of CN, an absorption line from an excited rotational state in addition to the ground rotational state was also seen. In fact, an excitation temperature of about 2.3 K was deduced, but the connection to cosmology and the cosmic background radiation was not realized. The full significance of these observations only became obvious in 1964 when the cosmic background radiation (CBR) was finally discovered using radiometers, and found to have a temperature of about 3.1 K.

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