First Observation of Photoionization of Laser-Excited Atoms by Synchrotron Radiation (SR)*.

J.M. Bizau; F. Wuilleumier; P. Dhez; D. Ederer; J.L. Legouet; J.L. Picque; P. Koch; David L. Ederer

doi:10.1364/EUVS.1982.TuC2

Topical Meeting on Laser Techniques for Extreme Ultraviolet Spectroscopy
Technical Digest Series (Optica Publishing Group, 1982),
paper TuC2
•https://doi.org/10.1364/EUVS.1982.TuC2

First Observation of Photoionization of Laser-Excited Atoms by Synchrotron Radiation (SR)^*.

J.M. Bizau, F. Wuilleumier, P. Dhez, D. Ederer, J.L. Legouet, J.L. Picque, P. Koch, and David L. Ederer

Laser Techniques for Extreme Ultraviolet Spectroscopy 1982

Boulder, Colorado United States
8–10 March 1982
ISBN:

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Multiphoton Processes I (TuC)

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J. M. Bizau, F. Wuilleumier, P. Dhez, D. Ederer, J. L. Legouet, J. L. Picque, P. Koch, and D. L. Ederer, "First Observation of Photoionization of Laser-Excited Atoms by Synchrotron Radiation (SR)*.," in Topical Meeting on Laser Techniques for Extreme Ultraviolet Spectroscopy, Technical Digest Series (Optica Publishing Group, 1982), paper TuC2.

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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(3p²P_1/2 or 3p²P_3/2) atoms in a weakly collimated Na(3s²S_1/2) 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 hν_SR+Na(2p⁶3p²P_J)→Na(2p⁵3s3p)¹ were driven near hν_SR≃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.

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