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- W2950606241 abstract "Availability of short, femtosecond laser pulses has recently made feasible the probing of phases in an atomic or molecular wave-packet (superposition of energy eigenstates). With short duration excitations the initial form of the wave-packet is an essentially real doorway state, and this develops phases for each of its component amplitudes as it evolves. It is suggested that these phases are hallmarks of a time arrow and irreversibility that are inherent in the quantum mechanical processes of preparation and evolution. To display the non-triviality of the result, we show under what conditions it would not hold; to discuss its truth, we consider some apparent contradictions. We propose that (in time-reversal invariant systems) the preparation of initially complex wave-packets needs finite times to complete, i.e., is not instantaneous." @default.
- W2950606241 created "2019-06-27" @default.
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- W2950606241 date "2000-07-09" @default.
- W2950606241 modified "2023-09-27" @default.
- W2950606241 title "Time Arrow in Wave-Packet Evolution" @default.
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