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-leveI Doppler-broadened system and qualitatively verified by experimental fluorescence excitation measurements.
SmithD. H.YoungJ. P. and ShawR. W, Mass Spectr. Revs.8, 345 (1989).
2.
DonohueD. L.SmithD. H.YoungJ. P.McKownH. S. and PritchardC. A, Anal. Chem.56, 379 (1984).
3.
SmithD. H.DonohueD. L. and YoungJ. P, Int. J. Mass Spectrom. Ion Proc.65, 287 (1985).
4.
GreenL. W.MacdonaldR. G.SopchyshynF. C. and BonnellL. J, Inst. Phys. Conf. Ser., Vol. 84 (Reson. Ioniz. Spectrosc. 86), HurstG. S. and MorganC. G, Eds. (1986), p. 145.
5.
DonohueD. L.SmithD. H.YoungJ. P. and RamseyJ. M, Inst. Phys. Conf. Ser., Vol. 71 (Reson. Ioniz. Spectrosc. 84), HurstG. S. and PayneM. G, Eds. (1984), p. 83.
6.
BekovG. I.ZherikhinA. N.LetokhovV. S.MishinV. I. and FedoseevV. N, Pis'ma ZH. Eksp. Teor. Fiz.33, 467 (1981) [JETP Lett. 33, 450 (1981)].
7.
FairbankW. M.Jr.SpaarM. T.ParksJ. E. and HutchinsonJ. M, Phys. Rev.A 40, 2195 (1989).
8.
LambropoulosP. and LyrasA, Phys. Rev.A 40, 2199 (1989).
9.
AlzettaG.GozziniA.MoiL. and OrriolsG, Nuovo Cimento36B, 5 (1976).
FeldM. S.BurnsM. M.PappasP. G. and MurnickD. E, Optics Lett.5, 79 (1980).
12.
ArimondoE. and OrriolsG, Nuovo Cimento Lett.17, 333 (1976).
13.
DaltonB. J. and KnightP. L, Optics Comm.42, 411 (1982).
14.
EkertA. and GawlikW, Phys. Lett.A 121, 175 (1987).
15.
ShoreB. W. and JohnsonM. A, Phys. Rev.A 23, 1608 (1981).
16.
DickB. and HochstrasserR. M, Chem. Phys.75, 133 (1983).
17.
MurnickD. E.FeldM. S.BurnsM. M.KuhlT. U. and PappasP. G, in Laser Spectroscopy IV, WalterH. and RotheK. W, Eds. (Springer-Verlag, New York, 1979), p. 195.
18.
WhitleyR. M., Double Optical Resonance, doctoral dissertation, University of Rochester, New York (1977).
19.
GawlikW. and ZachorowskiJ, J. Phys.B 20, 5939 (1987).
20.
HardeH. and BurggrafH, in Laser Spectroscopy VI, WeberH. P. and LuthyW, Eds. (Springer-Verlag, New York, 1983), p. 117.
