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We study the effect of moving mass center on atomic dynamics for various initial conditions, and the two-level atom coupled locally in inhomogeneous cavity to a near-resonant single-mode quantized field and the atomic levels are coupled by the multiphoton transitions. Our study shows that, the Doppler effect exercised by the motion of atom can lead to the modified phenomenon of oscillation collapse and revival in the atomic population inversion at the beginning of evolution.

The emission spectrum of a two-level atom with moving mass centre interacting with a single-mode radiation field in a ring cavity and the field entropy evolution has been studied. As a result, the theoretical curves of the emission spectrum have been given; the features of the emission spectrum depend not only on the photon statistical distribution of the initial field, such as the coherent field and the Fock state, but also on the bandpass width γ of the filter detector and distribution of mass-centre momentum. The properties of field entropy evolution show a damping function of time; it is different from that when the atom is at rest.

On page 2338 of this paper, equation (5.8) should be corrected as ϕ₂(λ) = (1 - λ){[(2λ - 3) / λ⁴] ln|1- λ²| - 3(1 - λ) / λ²} - 2 This appears in the PDF file in an alternative fractional format.