The adiabatic states of a quantum system interacting with an electromagnetic field in presence of dumping has been derived in analytical form, taking into account all phase factors of the state vector, even including its constant initial phases. Traceable physical behavior of the material phase, depending on the initial conditions imposed, can be distinguished. In addition, one can found that the material phase behaves as an additive dynamical quantity that closely follows the process of physical formation of the respective adiabatic state components. This inspires the understanding that the material phase is causally involved in the dynamics of the quantum system.
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