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%I #14 Dec 01 2017 05:10:16
%S 1,4,2,0,4,0,5,7,5,1,7,6
%N Decimal expansion of the hyperfine transition of neutral hydrogen in Hertz.
%D Ludwig Bergmann, Clemens Schaefer (edited by Wilhelm Raith), Constituents of Matter: Atoms, Molecules, Nuclei, and Particles, Walter de Gruyter & Co., Berlin, 1997, p. 203.
%H IEEE Transactions on Instrumentation and Measurement, <a href="http://tf.nist.gov/general/pdf/13.pdf">Measurement of the Unperturbed Hydrogen Hyperfine Transition Frequency</a>, vol. IM-19, No. 4 (1970), pp. 200-209.
%H Wikipedia, <a href="http://en.wikipedia.org/wiki/Hydrogen_line">Hydrogen line</a>
%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Primeval_Structure_Telescope">Primeval Structure Telescope</a>
%F Equals E * A081823 / A003676, where E is the energy (in eV) emitted after spin-flip transition of atomic hydrogen in its ground electronic state.
%e 1420405751.7667 +- 0.0009 Hz.
%K nonn,cons,less
%O 10,2
%A _Arkadiusz Wesolowski_, Nov 06 2017
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