Fluorescence studies of multiple-photon ionization processes: Four- and five-photon ionization of Sr at wavelengths of 558590 nm
Ημερομηνία
1989ISSN
1050-2947Source
Physical Review AVolume
39Issue
7Pages
3392-3400Google Scholar check
Metadata
Εμφάνιση πλήρους εγγραφήςΕπιτομή
An all-optical technique is presented for the study of multiphoton- ionization processes, based on fluorescence detection of the ions which are produced. A vapor is utilized in a moderate-density regime (10111015 cm-3) such that collisional effects are negligible. The technique is applied to multiple-photon ionization of Sr in the wavelength range of 558590 nm at laser intensities 150 GW/cm2. Fine-structure-resolved emission of the Sr+ (5p2P3/2/,1/d0) ions which are formed is observed at =407.8 and 421.5 nm, following either four- or five-photon absorption. No emission is observed from higher ionic states, with a detection sensitivity 1:103 with respect to the ionic-resonance emission. © 1989 The American Physical Society.