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We separate a Bose-Einstein condensate into an array of 2D sheets using a 1Doptical lattice, and then excite quantized vibrational motion in the directionnormal to the sheets. Collisions between atoms induce vibrationalde-excitation, transferring the large excitation energy into back-to-backoutgoing atoms, imaged as rings in the 2D plane. The ring diameters correspondto vibrational energy level differences, and edge-on imaging allowsidentification of the final vibrational states. Time dependence of these dataprovides a nearly complete characterization of the decay process including theenergies, populations, and lifetimes of the lowest two excited vibrationallevels. The measured decay rates represent a suppression of collisionalde-excitation due to the reduced dimensionality, a matter wave analog toinhibited spontaneous emission.Comment: 4 pages, 4 figre

Collisional deexcitation in a quasi-two-dimensional degenerate bosonic gas