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Isotope Ratio Biases in Resonance Ionization Mass Spectroscopy Due to Population Trapping

Volume 44, Number 7 (Aug. 1990) Page 1188-1192

Whitten, W.B.; Ramsey, J.M.


Population trapping via hyperfine ground-state coherences is proposed as a potential source of isotope ratio bias in resonance ionization mass spectra with coherent excitation of the first transition. Sample calculations are presented for a model 4-level Doppler-broadened system and qualitatively verified by experimental fluorescence excitation measurements.