Osnabrück 2002 – scientific programme

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A: Atomphysik

A 13: Photoionisation II (gemeinsam mit FV Molekülphysik)

A 13.4: Talk

Thursday, March 7, 2002, 14:45–15:00, HS 15/E10

Circular Dichroism in K-shell Ionization from Fixed-in-Space CO and N₂ Molecules — •T. Jahnke¹, Th. Weber¹, A. L. Landers², A. Knapp¹, S. Schössler¹, J. Nickles¹, S. Kammer¹, O. Jagutzki¹, L. Schmidt¹, A. Czasch¹, T. Osipov³, E. Arenholz⁴, A. T. Young⁴, R. Díez Muiño^4,5, D. Rolles⁴, F. J. García de Abajo⁴, C. S. Fadley^4,6, M. A. Van Hove^4,6, S. K. Semenov⁷, N. A. Cherepkov⁷, J. Rösch⁴, M. H. Prior⁴, H. Schmidt-Böcking¹, C. L. Cocke³, and R. Dörner¹ — ¹Institut für Kernphysik, University Frankfurt, August-Euler Str 6, D-60486 Frankfurt Germany — ²Dept. of Physics, Western Michigan Univ., Kalamazoo, MI 49008 — ³Dept of Physics, Kansas State Univ, Cardwell Hall, Manhattan KS 66506 — ⁴Lawrence Berkeley National Lab., Berkeley CA 94720 — ⁵Donostia International Physics Center, P. Manuel de Lardizabal 4, 20018 San Sebastian, Spain — ⁶Department of Physics, University of California, Davis, CA 95616 — ⁷State University of Aerospace Instrumentation, 190000 St.

We have measured the angular distributions of 1s-photoelectrons excited by circularly and linearly polarized light from fixed-in-space CO and N₂ molecules, in the vicinity of their shape resonances. A strong circular dichroism, i.e. a strong dependence on the sense of rotation of the polarization vector of the photons, is found for both molecules. State-of-the-art one-electron multiple scattering and partially-correlated random phase approximation calculations are in good agreement with many, but not all, aspects of the experimental data.