Berlin 2001 – wissenschaftliches Programm

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A: Atomphysik

A 5: Posters Tuesday (Photoionisation, Multi Photon Processes)

A 5.20: Poster

Dienstag, 3. April 2001, 12:30–15:00, AT3

Transition probabilities from Na(3p_3/2) to excited discrete and continuum states — •Kaspars Miculis¹ and Wilfried Meyer² — ¹Universität Kaisrslautern, Fachbereich Physik, Erwin Schrödinger Str., D-67663 Kaiserslautern, Germany — ²Universität Kaisrslautern, Fachbereich Chemie, Erwin Schrödinger Str., D-67663 Kaiserslautern, Germany

We present a calculation of photoabsorption cross sections from the Na(3p_3/2) state. The Coulomb and non-local exchange potentials were calculated using the Hartree-Fock method. For the core polarisation potential an empirical form was adopted. Transition moments were obtained from the wavefunctions and energies determined by the solution of the Schrödinger equation using the Numerov method. Probabilities of the 3p_3/2 → ns_1/2, nd_5/2,3/2 transition are tabulated for n = 3 - 50, and the photoionisation cross sections for photoelectron energy 0 - 2 eV are presented by an analytical formula. The results are compared with various experimental ant theoretical results for the lifetimes and cross sections. The accuracy of our results is estimated as 2 - 3 % in the lower energy range (from bound states up to 0.2 eV in continuum), and up to 5 % for the energies where the ionisation cross section becomes rather small. This estimate is corroborated by calculations with a variety of local exchange and core polarisation potentials each of which yields results within the given margin.