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21-centimeter line |
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21-centimeter line [¦twen·tē¦wən ′sen·tə‚mēd·ər ‚līn]
(spectroscopy) A radio-frequency spectral line of neutral atomic hydrogen at a wavelength of approximately 21 centimeters and a frequency of approximately 1420 megahertz, that results from hyperfine transitions between states in which the spins of the electron and proton are parallel and antiparallel. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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21-centimeter line |
21 AD 21 April 21 August 21 augustus 21 centimeter radiation 21 centimetre radiation 21 CLW 21 cm line 21 cm radiation 21 December 21 February 21 January 21 July 21 June 21 June 21 March 21 May 21 November 21 October 21 Ramadan 21 September 21-acetoxypregnenolone 21-centimeter line 21-centimeter radiation21-Centimetre Radiation 21-cm line 21-cm radiation 21-Hydroxylase 21-Hydroxylase 21-hydroxyprogesterone 211 21364 | |||||
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