Abstract
We have recently shown in a series of papers [1–7] that coupled equations methods of quantum collision theory can be conveniently used to investigate processes such as direct photodissociation [1–2], Resonance Raman Scattering in weak and strong fields [3–5], and higher order nonlinear spectroscopies [6–7] for diatomics involving several well isolated excited electronic states. This was done using the dressed molecule picture [8–12] of molecule-radiation interactions, wherein photon states are explicitly included into the theoretical description. All these methods are adequate only in the case of well isolated electronic states. There is an urgent need to derive a priori the most efficient representation for general electron-nuclear-radiation field systems such as occurs in intense field laser chemistry. In recent work we have examined this problem in an effort to incorporate as much as possible the electromagnetic field into the dynamics [13–14]. One might surmise that classical approaches should work sufficiently well at the high field intensities described here, and much work has been pursued in that direction. As we have pointed out previously, this involves treating both the molecule and the field classically. For electron-radiation interactions, one would prefer a quantum formulation since electronic states are, as a result of their large excitation energies, true quantum states. Furthermore, quantum mechanics leads to a linear theory of interactions whereas classical mechanics is a highly nonlinear theory [15]. Thus using a quantum formulation of matter-field interactions [16–17], we have been able to exploit methods of early (noncovariant) QED.
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Bandrauk, A.D. (1987). Coupled Equations and the Bloch-Nordsieck Representation for Molecules. In: Rahman, N.K., Guidotti, C., Allegrini, M. (eds) Photons and Continuum States of Atoms and Molecules. Springer Proceedings in Physics, vol 16. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-71778-9_20
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DOI: https://doi.org/10.1007/978-3-642-71778-9_20
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