Preferred frequency for interstellar communications

Details Preferred frequency for interstellar communications Preferred frequency for interstellar communications

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978natur.276..694m&link_type=abstract

Nature, vol. 276, Dec. 14, 1978, p. 694, 695.

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2

Extraterrestrial Life, Formaldehyde, Frequency Assignment, Interstellar Communication, Microwave Frequencies, Background Radiation, Masers, Noise Temperature

Scientific paper

It is suggested that the 4829.659-MHz line frequency of the 1(11)-to-1(10) rotational transition of formaldehyde is a plausible frequency to monitor for the purpose of detecting interstellar communications. The formaldehyde line is of interest because, as a result of the antimaser effect, it exhibits a very low excitation temperature. The background radiation temperature in the direction of dark clouds is below the 3 K background temperature; the background noise temperature, lowered approximately 1 K, is lower than at any other frequency band.

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