Real-time observation of vibrational revival in the fastest molecular system

Autor: Artem Rudenko, Joachim Ullrich, R. Moshammer, Th. Ergler, K. Zrost, Bernold Feuerstein, C. D. Schröter
Rok vydání: 2006
Předmět:
Zdroj: Chemical Physics
ISSN: 0301-0104
DOI: 10.1016/j.chemphys.2006.06.038
Popis: After preparing a coherent vibrational wave packet in the hydrogen molecular ion by ionizing neutral H2 molecules with a 6.5 fs, 760 nm laser pulse at 3 × 1014 W/cm2, we map its spatio-temporal evolution by the fragmentation induced with a second 6.5 fs laser pulse of doubled intensity. In this proof-of-principle experiment, we visualize the oscillations of this most fundamental molecular system, observe a dephasing of the vibrational wave packet and its subsequent revival. Whereas the experimental data exhibit an overall qualitative agreement with the results of a simple numerical simulation, noticeable discrepancy is found in the characteristic revival time. The most likely reasons for this disagreement originate from the simplifications used in the theoretical model, which assumes a Franck–Condon transition induced by the pump pulse with subsequent field-free propagation of the H 2 + vibrational wave packet, and neglects the influence of the rotational motion.
Databáze: OpenAIRE