Population transfer between molecular vibrational levels by stimulated Raman scattering with partially overlapping laser fields. A new concept and experimental results

Journal of Chemical Physics - Tập 92 Số 9 - Trang 5363-5376 - 1990
U. Gaubatz1, P. Rudecki1, S. Schiemann1, K. Bergmann1
1Fachbereich Physik der Universität, Postfach 3049, 6750 Kaiserslautern, Federal Republic of Germany

Tóm tắt

The feasibility of a novel technique for efficient and selective population transfer from a thermally populated level 1 via an intermediate state 2 to level 3 is experimentally demonstrated. It is shown for sodium dimers that the process of on- or near-resonance stimulated Raman scattering with only partially overlapping laser beams is, in particular, useful for the selective population of high vibrational levels of particles in a molecular beam. This is achieved when the interaction with the Stokes laser, coupling levels 2 and 3, begins earlier than the interaction with the pump laser. The phenomenon, which is closely related to the formation of ‘‘trapped states,’’ is quantitatively explained using the basis of eigenstates of molecules strongly coupled to the radiation fields. The similarity and difference to related techniques such as rapid adiabatic passage phenomena in two-level systems, off-resonant stimulated Raman scattering, or stimulated emission pumping is briefly discussed.

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Journal of Chemical Physics

Tập 92 Số 9

5363-5376

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