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Polarization-Dependent Spectra in the Photoassociative Ionization of Cold Atoms in a Bright Sodium Beam

We report measurements of cold photoassociative ionization (PAI) spectra obtained from collisions within a slow, bright Na atomic beam. A high-brightness atom flux, obtained by optical cooling and focusing of the atom beam, permits a high degree of alignment and orientation of binary collisions with respect to the laboratory atom-beam axis. The results reveal features of PAI spectra not accessible in conventional magneto-optical trap studies. We take advantage of this high degree of alignment to selectively excite autoionizing doubly excited states of specific symmetry.


Voir en ligne : Phys. Rev. A 65, 052719/1-8 (2002)