We report what is to our knowledge the first two-photon-excited fluorescence spectroscopy of atomic fluorine. A doubled dye laser at 286 nm is Raman shifted in H2 to 170 nm (sixth anti-Stokes order) to excite ground-state 2P°J fluorine atoms to the 2D°J level. The fluorine atoms are detected by one of two methods: observing the fluorescence decay to the 2PJ level or observing F+ production through the absorption of an additional photo by the excited atoms. We have measured relative two-photon absorption cross sections to and the radiative lifetimes of the 2D°J states.
© 1988 Optical Society of America
G. C. Herring, Mark J. Dyer, Leonard E. Jusinski, and William K. Bischel, "Two-photon-excited fluorescence spectroscopy of atomic fluorine at 170 nm," Opt. Lett. 13, 360-362 (1988)