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Brazilian Journal of Physics

Using photo-associative ionization of sodium to demostrate the optical control of cold collisions

Sérgio Carlos Zílio, Vanderlei Salvador Bagnato, Luís Gustavo Marcassa

Published Jan 1, 1995• 0 citations
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High Resolution Spectroscopy•Jan 1, 1993•0 citations
Collisions of ultracold trapped atoms ( T< 1mK) have opened a new field of atomic collisions with abundant opportunities for theory and experiments. Photo-associative ionization (PAI) in sodium atoms has been the first two-body collision Studied in optical traps3. In this process two ground state Na atoms absorb two photons during the course of the collisional encounter. The first absorption at long range put the colliding system on an attractive C3/R3 potential curve, and the two atoms begin to accelerate toward each other. A second absorption promotes the system to a doubly excited Na(3p)+Na(3p) potential curve from which the PAI process takes place at short range.