Repository: Freie Universit├Ąt Berlin, Math Department

State Selection in Non-Resonantly Excited Wave Packets by Tuning from Non-Adiabatic to Adiabatic Interaction

Owschimikow, N. and Schwentner, N. and Schmidt, B. (2009) State Selection in Non-Resonantly Excited Wave Packets by Tuning from Non-Adiabatic to Adiabatic Interaction. Phys. Rev. A, 80 (5). 053409.

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We show for rotational alignment of diatomic molecules that the crossover from non-adiabatic to adiabatic limits is well described by a convolution of excitation pulse envelope and sinusoidal molecular response and that it takes place in a uniform way in the region between 0.1 and 1 for the ratio of pulse duration to rotational period. In a non-resonant Raman-type excitation, this crossover is used to manipulate the J composition of a rotational wave packet with respect to the initial thermal distribution. By optimizing the duration of a single pulse, arbitrarily narrow distributions at low J levels can be formed. A double pulse excitation, where a longer second pulse acts as a selective dump pulse, allows to prepare non-thermal distributions centered at high J values. With the alignment signal on top of an isotropic background, experimental techniques sensitive to the induced anisotropy are optimally suited for implementation. To demonstrate the efficiency of the method, numerical simulations are carried out for rotational alignment in 14N2 at various experimentally relevant laser intensities. The scheme is transferable to quantum systems with a significant variation of transition frequencies between subsequent levels.

Item Type:Article
Subjects:Physical Sciences > Chemistry > Physical Chemistry
Physical Sciences > Physics > Chemical Physics
Divisions:Department of Mathematics and Computer Science > Institute of Mathematics > BioComputing Group
ID Code:808
Deposited By: Burkhard Schmidt
Deposited On:12 Feb 2010 09:32
Last Modified:03 Mar 2017 14:40

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