Abstract
Resonance ionization mass spectrometric analysis of strontium has been performed through a simple two colour 1+1cw laser excitation scheme, using a portion of the pump Ar + ion laser to excite the non-resonant ionization step, and the first results of precise isotope ratio measurements of Sr are presented. These measurements made in an ion microprobne, employing both thermal evaporation and primary ion beam sputtering for producing neutral Sr atoms, have exhibited strong even-odd effects for the 87Sr/ 86Sr ratio, with a near 10% depletion of the 87Sr isotope, and the dependence of this anomalous isotopic effect on laser output power has been studied. In sputter-induced RIMS experiments, primary ion beams of oxygen, argon and xenon, were used for sputtering pure Sr metal targets, and the calculated ionization yields are compared with the results of a simple mathematical analysis of the resonance ionization process. Possible reason for the quantitative differences observed between the measured and the predicted results are suggested and discussed.
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