Phase sensitive adiabatic states, or does the material phase recognize thephysical reality?

Phase sensitive adiabatic states for a quantum system interacting with an e lectromagnetic field have been derived taking into account all material pha se factors of the initial bare states. The adiabatic states so obtained sho w a traceable phase behavior, causally depending on the initial conditions and the relevant physical processes. Experimental appearance of the materia l phase effects has been discussed. (C) 2000 Elsevier Science B.V. All righ ts reserved.