Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5428410 | Journal of Quantitative Spectroscopy and Radiative Transfer | 2014 | 8 Pages |
â¢Laser-induced photoionization and fluorescence signals have been simultaneously observed.â¢The density matrix formalism has been employed to analyze these signals.â¢Two-color laser-induced fluorescence was used to measure the second-step transition probability.â¢The second-step transition probability obtained was used to infer the photoionization cross-section.â¢Transition probability and photoionization cross-section have been measured in a single experiment.
Laser-induced photoionization and fluorescence signals were simultaneously observed in atomic samarium using Nd:YAG-pumped dye lasers. Two-color, three-photon photoionization and two-color fluorescence signals were recorded simultaneously as a function of the second-step laser power for two photoionization pathways. The density matrix formalism has been employed to analyze these signals. Two-color laser-induced fluorescence signal depends on the laser powers used for the first and second-step transitions as well as the first and second-step transition probability whereas two-color, three-photon photoionization signal depends on the third-step transition cross-section at the second-step laser wavelength along with the laser powers and transition probability for the first and second-step transitions. Two-color laser-induced fluorescence was used to measure the second-step transition probability. The second-step transition probability obtained was used to infer the photoionization cross-section. Thus, the methodology combining two-color, three-photon photoionization and two-color fluorescence signals in a single experiment has been established for the first time to measure the second-step transition probability as well as the photoionization cross-section.