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Isotope ratio measurements in lead using three‐photon one‐colour resonance ionization mass spectrometry
Author(s) -
Telle H. H.,
Telyatnikov A. L.,
McNaghton E. D.,
Brown R. A.,
McCormick A.
Publication year - 1993
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.1290070625
Subject(s) - chemistry , isotope , mass spectrometry , thermal ionization mass spectrometry , laser , ionization , natural abundance , atmospheric pressure laser ionization , photoionization , analytical chemistry (journal) , atomic physics , optics , physics , nuclear physics , ion , organic chemistry , chromatography
Resonance effects on measured isotope ratios in lead using three‐photon one‐colour resonance ionization mass spectrometry are discussed. The shape of the ionization signal is considered for the case of a non‐monochromatic laser field. The intensity of the laser radiation is adjusted to be low enough not to cause saturation of the transitions. The variation of the measured isotope ratio as a function of laser frequency is considered. It is shown that the deviation of the measured from the expected isotope ratio, for a Lorentzian laser lineshape equals the ratio of the isotope shift to the laser bandwidth. Unfortunately, the background noise in the experiments makes verification of this behaviour difficult for the isotopes of low abundance.