Quantum Ignition of Intramolecular Rotation by Means of IR+UV Laser Pulses

Chiral structure of (4-methyl-cyclohexylidene)fluoromethane

Yuichi Fujimura, Leticia González, Dominik Kröner, Jörn Manz, Imed Mehdaoui, and Burkhard Schmidt

Quantum ignition of intramolecular rotation may be achieved as follows: First, a few-cycle infrared (IR) laser pulse excites the torsional vibration in an oriented molecule. Subsequently, a well timed ultrashort ultraviolet (UV) laser pulse induces a Franck-Condon type transition from the electronic ground state to the excited state with approximate conservation of the intramolecular angular momentum. As a consequence, the torsional motion is converted into a unidirectional intramolecular rotation, with high angular momentum (≈ 100 ħ). The mechanism is demonstrated by means of representative laser driven wave packets which are propagated on ab initio potential energy curves of the model system (4-methyl-cyclohexylidene)fluoromethane.

Chem. Phys. Lett. 386 (4-6), 248-253 (2004)