Investigations of Stark effects in xenon Rydberg states by laser-induced fluorescence-dip spectroscopy

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E. Wagenaars and G. M. W. Kroesen
Department of Applied Physics, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands

M. D. Bowden
Department of Physics and Astronomy, The Open University, Milton Keynes, MK7 6AA, United Kingdom

Received 12 June 2006; published 19 September 2006

Starkeffects in Rydberg states of xenon atoms were investigated bothexperimentally and theoretically. The experimental part consisted of laser-induced fluorescence-dipspectroscopy. Using a (2+1)-photon excitation scheme, xenon atoms were excitedfrom the ground state to high-lying Rydberg ns and ndlevels. Measurements were made in a controllable electric field environment,produced by applying a pulsed voltage to two parallel metalelectrodes. For energy levels with principal quantum numbers ranging from12 to 18, Stark shifts of up to 4.8 cm^–1 wereobserved for electric fields ranging from 0 to 4000 V/cm. Additionally, mixing ofenergy levels in high electric fields was measured for ndlevels. The experimental results were compared to a theoretical calculationbased on solving the Schrödinger equation for a perturbed Hamiltonian.The calculation method proved to be very accurate for predictingStark effects in Rydberg nd levels, while for ns levelsthe agreement was only moderate, probably due to deviations fromthe assumption of a hydrogenlike atom that is used inthe calculation. Finally, the feasibility of using measurements of Starkshifts of Rydberg levels as a diagnostic for electric fieldsin low-pressure discharges was discussed.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.74.033409
DOI:	10.1103/PhysRevA.74.033409
PACS:	32.60.+i; 52.70.-m; 52.38.Dx 32.60.+i Zeeman and Stark effects in atoms 52.70.-m Plasma diagnostic techniques and instrumentation 52.38.Dx Laser light absorption in plasmas including collisional, parametric, etc YEAR: 2006
KEYWORDS:	Stark effect, spectral line shift, fluorescence, photoexcitation, atom-photon collisions, Rydberg states, ground states, discharges (electric), plasma diagnostics, xenon

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