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A: Atomphysik

A 5: Atome in
äusseren Feldern

A 5.7: Vortrag

Montag, 24. März 2003, 15:30–15:45, F128

Ab initio photoionization cross sections of alkali Rydberg states in crossed electric and magnetic fields — •Marius Iacomi¹, Javier Madroñero², Gernot Stania^3,4, Saverio Bivona¹, Herbert Walther^3,4, and Andreas Buchleitner² — ¹Dipartimento di Fisica e Tecnologie Relative, Università di Palermo, Viale delle Scienze, I-90128 Palermo — ²Max-Planck-Institut für Physik komplexer Systems, Nöthnitzer Str. 38, D-01187 Dresden — ³Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, D-85748 Garching — ⁴Sektion Physik der Universität München, Am Coulombwall 1, D-85748 Garching

We present an accurate quantum treatment of alkali Rydberg states exposed to crossed electric and magnetic fields, motivated by ongoing experiments in Garching. Our calculations probe the parameter regime of overlapping resonances, with special emphasis devoted to possible signatures of Ericson fluctuations in the experimental photoionization cross sections. The theoretical/numerical approach relies on a combination of R-matrix theory (to account for the multielectron core), complex dilation (for an exact description of the continuum coupling), and a suitable basis set (such as to take optimal advantage of the fundamental symmetries of the atomic species).