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Some unexplored decoherence aspects within the Caldeira-Leggett masterequation are analyzed and discussed. The decoherence process is controlled bythe two environment parameters, the relaxation rate or friction and thetemperature, leading to a gradual transition from the quantum to classicalregime. Arrival time distributions, nonminimum-uncertainty-product orstretching Gaussian wave packets, identical particles and diffraction in timedisplay interesting features during the decoherence process undergone by thetime dependent interference patterns. We show that the presence of a constantforce field does not affect the decoherence, {\it positive} values of thestretching parameter reduces the rate of decoherence, the symmetry of the wavefunction for identical particles plays no role when open dynamics areconsidered; and diffraction in time and space is gradually washed out byincreasing the temperature and/or relaxation rate in the zero dissipation limitwithin the so-called quantum shutter problem.

On some unexplored decoherence aspects in the Caldeira-Leggett formalism: arrival time distributions, identical particles and diffraction in time