Field-free molecular orientation of (1)Sigma and (2)Pi molecules at high temperature

Ronald Tehini (1) , Md Ziaul Hoque (1) , Olivier Faucher (1) , Dominique Sugny (1)

1 ICB - Laboratoire Interdisciplinaire Carnot de Bourgogne

We analyze the control of field-free molecular orientation at high temperature by use of a two-color laser bipulse strategy proposed in Zhang et al. [Phys. Rev. A 83, 043410 (2011)]. A general study shows that there exist two types of linear molecules for which a different mechanism has to be used. For molecules with a large hyperpolarizability, a monochromatic laser pre-pulse is applied before the two-color laser pulse at a time close to the rotational period T-r, while for molecules with a small hyperpolarizability, the optimal delay is found close to T-r/4 or 3T(r)/4. We extend this analysis to the case of a (2)Pi molecule such as NO where a similar control strategy can be derived. These control processes are robust against temperature effects.

Mots clés: COHERENT CONTROL; molecular alignment; ultrashort pulse; Rotational dynamics; molecular orientation

Domaines: Physique Atomique [physics.atom-ph]

Ronald Tehini, Md Ziaul Hoque, Olivier Faucher, Dominique Sugny. Field-free molecular orientation of (1)Sigma and (2)Pi molecules at high temperature. Physical Review A : Atomic, molecular, and optical physics [1990-2015], 2012, 85, pp.043423. ⟨10.1103/PhysRevA.85.043423⟩. ⟨hal-00760256⟩