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Effect Of Molecular Rotations On High Intensity Absorption In CO 2

1986; SPIE; Linguagem: Inglês

10.1117/12.938706

1996-756X

André D. Bandrauk, Lorraine Claveau,

Mechanical and Optical Resonators

In intense fields, the Rabi frequency ω R = pE/h can easily be of the order of rotational and vibrational energies of molecules. This means that rotations as well as vibrations become strongly perturbed so that perturbative methods no longer apply. We will show that nonperturbative methods can be derived from the concept of the dressed molecule. This leads to coupled equations which are used ko simulate numerically the multiphoton processes which will occur at intensities > 10 8 W/cm 2 . Furthermore, for multiphoton rotational tran-sitions, one can derive analytical models which help one understand the temporal behaviour of energy flow in a molecule in terms of its dressed spectrum, such as chaotic or regular (nonchaotic) behaviour. These results are of relevance to the manifestation of multiphoton coherences in a CO 2 spectrum at very high intensities (I % 10 12 W/cm 2 ).