Düsseldorf 2007 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 20: Atomic Systems in External Fields II

A 20.4: Vortrag

Donnerstag, 22. März 2007, 12:30–12:45, 6G

Noise induced ionization and dissociation of diatomic molecules — •Anatole Kenfack¹, Frank Grossmann², and Jan-Michael Rost¹ — ¹Max-Planck Institute for the Physics of Complex Systems, D-01187 Dresden, Germany — ²Institute for Theoretical Physics, Dresden University of Technology, D-01062 Dresden, Germany

A quantum system can efficiently absorb energy from a noise source. We have demonstrated this effect in the noise induced dissociation of polar diatomic molecules[1]. In a second step we investigate, beyond the Born-Oppenheimer approximation, the competition between ionization and dissociation of the Hydrogen molecular ion (H2+) exposed to the same noise of source. The time dependent Schroedinger equation is solved for a three dimensional H2+ system with two electronic and one vibrational degrees of freedom. We show that by appropriately choosing the noise kicking period, with respect to other time scales of the system, one can selectively ionize or dissociate H2+. This selectivity is difficult to achieve with the use of laser fields [2,3].

[1] A. Kenfack and J.M. Rost, J. Chem. Phys. 123, 204322 (2005)

[2] S. Chelkowski, A. Bandrauk, and P.B. Corkum, Phys. Rev. Lett. 65, 2355 (1990)

[3] J. H. Kim, W. K. Liu, F. R. W. McCourt and J. M. Yuan, J. Chem. Phys. 112, 1757 (2000)