Quantum interference effect in collision-induced intramolecular energy transfer within singlet-triplet mixed states
Abstract
The principle of wave-particle duality of quantum mechanics ascertains that any microscopic particle must also exhibit wave properties. The matter wave, or de Broglie wave, was first evidenced by Davisson and Germer in 1927 in the electron diffraction by crystals. In recent years, numerous fascinating examples of the quantum interference effect (QIE) have been discovered in the molecular systems in their excitation, dissociation and ionization by photons as well as in collision processes. Our group was the first to obtain the experimental evidence of QIE in a collision, specifically for the singlet-triplet mixed state of a diatomic species, and to derive an explicit expression for its energy transfer cross-section. In this expression, the interference phase angle (thetast) that describes the phase angle difference between singlet and triplet energy transfer channels is defined and experimentally measured for CO(A (1)Pi, v = 0/ e (3)Sigma(-), v = 1)-M collision system with M = rare gases (He, Ne, Ar), homonuclear diatomics (H-2, N-2, O-2) and heteronuclear diatomics (HCl) via the optical-optical double resonance multiphoton ionization (OODR-MPI) technique. We have also observed QIE in Na-2( A (1)Sigma(u)(+), v = 8 / b(3) Pi(0u), v = 14)-Na collision. More recently, we have carried out quantum scattering calculations of the interference angle based on the first order Born approximation of time dependent perturbation theory. For atom-diatom collision, the anisotropic…
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