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A294666 Decimal expansion of the hyperfine transition of neutral hydrogen in Hertz. 0
1, 4, 2, 0, 4, 0, 5, 7, 5, 1, 7, 6 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

10,2

REFERENCES

Ludwig Bergmann, Clemens Schaefer (edited by Wilhelm Raith), Constituents of Matter: Atoms, Molecules, Nuclei, and Particles, Walter de Gruyter & Co., Berlin, 1997, p. 203.

LINKS

Table of n, a(n) for n=10..21.

IEEE Transactions on Instrumentation and Measurement, Measurement of the Unperturbed Hydrogen Hyperfine Transition Frequency, vol. IM-19, No. 4 (1970), pp. 200-209.

Wikipedia, Hydrogen line

Wikipedia, Primeval Structure Telescope

FORMULA

Equals E * A081823 / A003676, where E is the energy (in eV) emitted after spin-flip transition of atomic hydrogen in its ground electronic state.

EXAMPLE

1420405751.7667 +- 0.0009 Hz.

CROSSREFS

Sequence in context: A182501 A048819 A076114 * A051478 A121829 A021708

Adjacent sequences:  A294663 A294664 A294665 * A294667 A294668 A294669

KEYWORD

nonn,cons,less

AUTHOR

Arkadiusz Wesolowski, Nov 06 2017

STATUS

approved

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Last modified April 14 00:42 EDT 2021. Contains 342941 sequences. (Running on oeis4.)