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To populate these states require physical excitation processes; these states may have finite lifetimes. The Q-component is called the time-delaying component by Feshbach in the context of nuclear reactions [29]. , are the projected hamiltonians, and we write H instead of Ho+W. The imaginary energy is included in case open channels are found in the Q-subspace; tends to zero from positive values. will QUANTUM MECHANICS OF ELECTRO-NUCLEAR SYSTEMS 37 be indicated as E(+) in what follows. The partitioning technique leads to an effective hamiltonian for the P-system: and the Schrödinger equation looks like (25) The effective hamiltonian is energy dependent, complex and nonlocal.

Thus, for any ET reaction whose |in> and |out> asymptotic electronic states share the same parity, the actual interconversion would require the mediation of a TS. 40 O. TAPIA The quantum states relevant to the ‘‘harpoon mechanism” (see page 134 in ref. [26]) for the reaction of K + Br2 producing K(Br + Br are depicted as: |1> = |K + Br-Br >; |2> = 1 K+ + Br-Br¯ >; and |3>=| K-Br + Br >. Chemical graphs indicate where the main attractors (bonds) are. It is apparent that the stationary source for the negatively charged bromine molecule has a larger distance than the neutral species, and the rovibrational state may have larger nuclear fluctuations.

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