Hannover 2013 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 34: Ultrashort laser pulses: Applications
Q 34.4: Talk
Tuesday, March 19, 2013, 14:45–15:00, F 142
Controlling electron localization in H2+ with optical cycles — •T. Rathje1, A.M. Sayler1, S. Zeng2, P. Wustelt1, B. Esry2, and G.G. Paulus1 — 1Institute of Optics and Quantum Electronics and Helmholtz-Institute Jena, Max-Wien-Platz 1, 07743 Jena, Germany — 2J.R. Macdonald Laboratory, Kansas State University, Manhattan Kansas, 66506 US
We report on measurements and calculations of the absolute phase effects in the photodissociation of the simplest molecule, H2+, with a 5-fs few-cycle laser pulse. Control of the localization of the electron between the two nuclei during the dissociation process is facilitated by ultra-short laser pulses. The H2+ molecule is generated with a duo-plasmatron ion source. Compared to previous experiments using neutral molecules, our dissociation process is not preceded by an photoionization process through a laser pulse. This well collimated ion beam is perpendicular to and overlapped with the laser beam, focused to peak intensities up to 4x1014 W/cm2. At the same time an accurate measurement of the absolute phase for every single laser shot is obtained with a phase-meter. The two dissociation fragments are recorded in coincidence with a position- and time-sensitive detector. In this way, a phase-resolved and kinematically complete measurement is realized from which the phase-dependence of the KER-spectra and electron localization can be determined. The experimental results agree well with 3D-TDSE calculations, that take nuclear vibration and rotation into account.