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Measurement of isotope effect on photodetachment cross‐sections of OH − and OD − by Fourier‐transform ion cyclotron resonance mass spectrometry
Author(s) -
Naito Yasuhide,
Ueno Hitoshi,
Huramatsu Eiji,
Inoue Masao
Publication year - 1994
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.1290080509
Subject(s) - fourier transform ion cyclotron resonance , chemistry , ion , ion cyclotron resonance , mass spectrometry , analytical chemistry (journal) , atomic physics , isotope , irradiation , resonance (particle physics) , electron cyclotron resonance , cyclotron , physics , nuclear physics , organic chemistry , chromatography
Isotope effect on photodetachment cross‐sections of OH − and OD − ions was studied using a Fourier‐transform ion cyclotron resonance mass spectrometer. The ions were produced by electron impact from a mixture of H 2 O and D 2 O gases, trapped in a cylindrical cell and irradiated by a 337 nm photon beam from a nitrogen pulsed laser. Intensities of both ions were measured simultaneously with and without irradiation. This allowed the determination of the ratio of the photodetachment cross‐sections of OH − and OD − ions without knowledge of the photon flux intensity and the geometrical overlap factor of laser beam and ion cloud in the cell. From the present result the difference in the equilibrium internuclear distances between OH − and OH was estimated as r (OH − ) r (OH) ≈ −0.0074 Å.