Abstract
In a triple, orthogonal crossed beam experiment, we have studied photoionization of excited Na atoms. A cw ring dye laser (few W/cm2) locked to the D1 or D2 absorption lines produced a steady-state fraction up to 20% of excited Na(3p2P1/2 or 3p2P3/2) atoms in a weakly collimated Na(3s2S1/2) beam with density ≲ 1013 cm−3. Monochromatized SR from the ACO storage ring provided the photoionizing radiation. A cylindrical mirror electron spectrometer was used to measure photoelectron spectra. First measurements of photoionization from the 2p subshell with the 3p orbital occupied were obtained. Transitions to autoionizing resonances hνSR+Na(2p63p2PJ)→Na(2p53s3p)1 were driven near hνSR≃31 eV from either J=1/2 or J=3/2 levels. A comparison of the results for the 2p63p →2p53pεd and 2p63s→2p53sεℓ' ionization channels will be given.
© 1982 Optical Society of America
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