Abstract

Resonance ionization mass spectrometry (RIMS) was developed as an analytical tool using pulsed lasers and element selective ionization.¹ We have demonstrated recently that the 100% duty cycle of cw lasers results in a larger ionization efficiency for Lu relative to the use of pulsed lasers.² However, it was necessary to tightly focus the cw laser, leading to poor sample utilization and power broadening of the resonant transition. We are ultimately interested in high efficiency, isotope selective ionization. In this paper we present the results of combining a low irradiance tunable laser to provide selectivity without power broadening, with a high irradiance argon ion laser to provide efficient ionization over large volumes. Progress towards Doppler-free excitation will also be discussed.

© 1987 Optical Society of America