Alignment and orientation of nonpolar molecules utilizing the laser-induced ac-Stark effect

Linskens, A. F.; Dam, N.; Reuss, J.; Sartakov, B.
December 1994
Journal of Chemical Physics;12/1/1994, Vol. 101 Issue 11, p9384
Academic Journal
The laser-induced ac-Stark effect influences the M sublevels of a molecule differently. This provides for a spectroscopical means of isolating individual M sublevels and thereby of producing aligned, or even oriented, excited molecules. We present an experimental study of this phenomenon in the spherical top SF6 using narrow bandwidth CO2 lasers. One high power CO2 laser induces an |M|-dependent ac-Stark shift of the magnetic sublevels of the J=4 level of the vibrational ground state. A weak probe laser induces a two-photon transition starting from the same level and produces aligned, vibrationally excited molecules under appropriate experimental conditions. A theoretical description is provided in the dressed state picture. In principle, our triple-resonance technique is able to produce aligned or oriented molecules in a well-defined (vibrationally) excited state in any molecule possessing a similar three level system. © 1994 American Institute of Physics.


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