Asymmetric scattering of polarized photons and electrons by chiral molecules

Details Asymmetric scattering of polarized photons and electrons by chiral molecules Asymmetric scattering of polarized photons and electrons by chiral molecules

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aipc..379..255p&link_type=abstract

Physical orgin of homochirality in life. AIP Conference Proceedings, Volume 379, pp. 255-265 (1996).

Physics

Photon Interactions With Molecules, Electron Scattering, Macromolecules And Polymer Molecules, Optical Activity, Optical Rotation, Circular Dichroism

Scientific paper

We review the recent theoretical activity connected with the problem of the scattering of polarized particles, photons or electrons and positrons, by chiral molecules. It is shown that the asymmetry of the total ionization cross-sections (σ+-σ-)/(σ++σ-) for slow, v~α, longitudinally polarized charged particles appears in the order α2 from the degree of molecule geometrical asymmetry even in neglect of the exchange interaction and the spin-orbit interaction inside a molecule (Pospelov, 1993). It contradicts to the common believe that the asymmetry in the scattering of polarized positrons is suppressed by a factor α4 (Zel'dovich and Saakyan, 1980). In the case of the electron scattering the exchange interaction combined with the specifics of electron state inside chiral molecule leads to the further Z2-enhancement of the effect (Hegstrom, 1982). This specifics, the helicity density of the molecular electron, manifests also in the high-frequency asymptotics of the scattering of circularly polarized light (Khriplovich and Pospelov, 1992). The matrix element determining this asymptotics practically coincides, up to an overall factor, with that of the weak interaction responsible for the P-odd energy difference of right- and left-handed molecules.

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