The New Encyclopædia Britannica: L-ZEncyclopædia Britannica, 1992 - 32 pages |
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Page 560
... Radio - frequency measurements of intervals in ground levels and excited levels of atoms can be made by placing a sample of atoms ( usually a vapour in a glass cell ) within the coil of an oscillator and tuning the oscillator until a ...
... Radio - frequency measurements of intervals in ground levels and excited levels of atoms can be made by placing a sample of atoms ( usually a vapour in a glass cell ) within the coil of an oscillator and tuning the oscillator until a ...
Page 573
... radio - frequency photon is emitted by an undisturbed , excited atom every 11,000,000 years : the transition is very infrequent ; that is , it is highly " forbidden . " Nevertheless , in practice , the line is readily detected in any ...
... radio - frequency photon is emitted by an undisturbed , excited atom every 11,000,000 years : the transition is very infrequent ; that is , it is highly " forbidden . " Nevertheless , in practice , the line is readily detected in any ...
Page 577
... radio - frequency mass spectrometer . A magnetic field is in a direction perpendicular to the plane of the diagram . radio- frequency generator Positive ions are produced by a stream of electrons mov- ing along the direction of the ...
... radio - frequency mass spectrometer . A magnetic field is in a direction perpendicular to the plane of the diagram . radio- frequency generator Positive ions are produced by a stream of electrons mov- ing along the direction of the ...
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