Photoionisation of a helium atom involving autoionisation states coupled by a circularly polarised laser field

Journal Article · Mon Jan 31 00:00:00 EST 2005 · Quantum Electronics (Woodbury, N.Y.)

DOI:https://doi.org/10.1070/QE2005V035N01ABEH002787· OSTI ID:21470673

Gryzlova, E V ^[1]; Magunov, A I ^[2]; Rotter, I ^[3]; Strakhova, S I ^[4]

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1. Department of Physics, M.V. Lomonosov Moscow State University, Moscow (Russian Federation)
2. A.M. Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow (Russian Federation)
3. Max-Planck-Institut fur Physik komplexer Systeme (Germany)
4. D.V. Skobel'tsyn Institute of Nuclear Physics, M.V. Lomonosov Moscow State University, Moscow (Russian Federation)

The rotating wave approximation is used to obtain parametric expressions for the resonance cross section for the atomic ground state ionisation by linearly polarised probe radiation in the vicinity of an autoionisation state coupled resonantly to another autoionisation state through circularly polarised laser radiation. Calculations are made for the 2s2p {sup 1}P and 2s3d {sup 1}D states of the helium atom. It is shown that the structure of the photoionisation cross-section spectrum formed for circularly polarised laser radiation differs qualitatively from the structure formed in the case of linear polarisation. The dependence of this structure on the intensity and frequency of laser radiation and the direction of polarisation of the probe radiation is studied. (interaction of laser radiation with matter. laser plasma)

• OSTI ID: 21470673
• Journal Information: Quantum Electronics (Woodbury, N.Y.), Vol. 35, Issue 1; Other Information: DOI: 10.1070/QE2005v035n01ABEH002787; ISSN 1063-7818
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
APPROXIMATIONS
ATOMS
AUTOIONIZATION
CROSS SECTIONS
HELIUM
LASER RADIATION
PHOTOIONIZATION
POLARIZATION
RESONANCE
SPECTRA
CALCULATION METHODS
ELECTROMAGNETIC RADIATION
ELEMENTS
FLUIDS
GASES
IONIZATION
NONMETALS
RADIATIONS
RARE GASES