title: Frequency and width crossing of two interacting resonances in a microwave cavity
abstract: Frequency and width crossing have been observed for two coupled resonances in a microwave cavity. The cavity consisted of two nearly identical rectangular boxes. The boxes were coupled by a slit of variable width. The data are well described by a non-Hermitean S matrix leading to a 2x2 non-Hermitean effective Hamiltonian. The values of the interaction strength |v| for which width crossing and frequency crossing, respectively, were observed, are above and below a critical value |v(c)| for which one expects a joint frequency and width crossing.
authors.affiliation: Institut fur Kernphysik, Universitat zu Koln, Zulpicher Strasse 77, D-50937 Koln, Germany.
authors.initials: M
authors.lastname: Philipp
authors.initials: P
authors.lastname: Brentano
authors.initials: G
authors.lastname: Pascovici
authors.initials: A
authors.lastname: Richter