Abstract
Isotopic selectivities and isotope ratio enhancement factors have been calculated for 4f55d6s29D50-4f75d6s6p 9D6 (585.622 nm) transition of gadolinium and for 5d6s22D3/2-5d6s6p 4F3/20 (753.9 nm) transition of lanthanum by simulating the spectra assuming natural isotopic abundance of the samples. The atomic line shapes are assumed to be Lorentzian. Isotopic selectivities and isotope ratio enhancement factors for single step excitations have been computed. The isotope ratio enhancement factors estimated by us are half the value obtained by Young. et al. This is because the isotope ratio enhancement obtained by them is for a two colour RIMS where as our computations for selectivities are for a single step excitation. Considering the statistical error in the experimental values, our estimated isotopic selectivities are in good agreement with the available experimental data.
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