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Quantum Electronics and Laser Science Conference

Photoionization cross-section measurements of excited states in xenon and oxygen atoms using fluorescence depletion spectroscopy

Stefan Kröll, Jesse D. Buck, William K. Bischel

Published Apr 24, 1989• 0 citations
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Two-photon absorption cross sections of ground-state xenon atoms to the 2p5{p}_{5}p5​(J=0), 2p6{p}_{6}p6​(J=2), and 2p9{p}_{9}p9​(J=2) states in the 5${p}^{5}6pconfigurationandphotoionizationcrosssectionsat193and248nmfromthe26p configuration and photoionization cross sections at 193 and 248 nm from the 26pconfigurationandphotoionizationcrosssectionsat193and248nmfromthe2{p}_{5}$ and 2p6{p}_{6}p6​ states have been determined and are compared with previous experimental and theoretical values where such exist. Fluorescence depletion spectroscopy as a method for determining excited-state photoionization cross sections is described and discussed and shown to have many attractive features. Based on our cross-section measurements, we calculate that (2+1)-photon photoionization in Xe with a laser intensity of 30 MW/cm2{\mathrm{cm}}^{2}cm2 during 25 ns at 249.6 nm, using the 2p5{p}_{5}p5​(J=0) state as an intermediate state, can produce a fractional ionization of 10%.
We report the first measurement of the absolute cross section for photoionization of the 7S7S7S state of cesium. The measurement employed a new technique in which the density of the excited-state atoms was determined by the amount of fluorescence. The cross section for photoionization by 540-nm light is 1.14(10)\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}19}$ cm2{\mathrm{cm}}^{2}cm2. We also propose a second new technique for the absolute measurement of photoionization cross sections which is based on modulated fluorescence.