Mainz 2017 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 1: Collision Experiments

A 1.7: Vortrag

Montag, 6. März 2017, 16:15–16:30, HS 20

Effective two-channel model for cold reactive collisions — •Christian Cop and Reinhold Walser — Institut für Angewandte Physik, Technische Universität Darmstadt, Schlossgartenstr. 7, 64289 Darmstadt

In a previous work experimental data [1] of cold collisions of metastable neon atoms (Ne*) has been analyzed theoretically in terms of a coupled two-channel model with realistic interaction potentials [2]. This model gave good agreement between theory and experiment.

Here we present an effective two-channel square well potential which contains all the features present in the coupled two-channel model of [2]. For the coupled square-well potential, the S matrix is analyzed analytically in the complex k plane. Based on a single pole expansion of the S matrix we derive analytic expressions for the two-body loss rates of the coupled square-well potential. These analytic expressions show good agreement of scattering rates in the coupled square-well model and the model with realistic interaction potentials. Thus, threshold collisions rates can be well approximated by a single pole expansion of an effective two-channel potential theory.

[1] J. Schuetz et al., Heteronuclear collisions between laser-cooled metastable neon atoms, Phys. Rev. A, 86, 022713 (2012).

[2] C. Cop et al., Penning ionization and elastic scattering in cold collisions of metastable neon atoms, to be published.