ATOMIC WAVE-PACKET IN A RING CAVITY

We solve the spontaneous and induced emission problem for an atom coup led to a ring cavity, taking into account the center-of-mass motion. W e solve analytically the non-Hermitian Schrodinger equation Tor the sp ontaneous emission. Then we use this solution to test our quantum Mont e Carlo solution for the induced processes. The coherence of atomic ce nter-of-mass wave function combined with a well-defined phase of the f ield produces noteworthy interference phenomena. They may be understoo d with the help of the semiclassical solution.