Electrodynamical forbiddance of the strong quadrupole light-molecule interaction and its manifestation in fullerene C60

4^th International Conference on Photonics & Laser Technology

July 28-29, 2016 Berlin, Germany

Aleksey Mickhailovich Polubotko

A F Ioffe Physico-Technical Institute, Russia
State University of Information Technologies, Russia

Scientific Tracks Abstracts: J Laser Opt Photonics

Abstract :

At present it is well proved in our works that the reason of SERS, SEHRS and SEIRA is so-called strong quadrupole lightmolecule interaction, which arises in surface electromagnetic fields strongly varying in space near a rough metal surface. This interaction is associated with terms of the light-molecule interaction Hamiltonian with the quadrupole moments Qxx, Qyy and Qzz, or their linear combinations transforming after the unit irreducible representation of the molecule symmetry group, which results in appearance of strong forbidden lines in molecules with sufficiently high symmetry. The general requirement for observation of these lines is belonging of the molecule to the symmetry group, where the component of the dipole moment dz, which is perpendicular to the surface transforms after the irreducible representation another, than the unit one. However, it appears that for the molecules, which belong to the cubic symmetry groups T, Td, Th, O, Oh and the icosahedral groups I and Ih the strong quadruple light-molecule interaction, is forbidden due to specificity of these groups and the electrodynamic law divE=0. Therefore, the light-molecule interaction in these molecules is of a purely dipole type. This property must result in the absence of the lines with the unit irreducible representation in the SEIRA and SEHRS spectra of molecules, belonging to these groups. The absence of the indicated lines at 496 and 1470 cm-1 was observed in fullerene C60 that strongly supports the Dipole- Quadrupole theory of the indicated processes.

Biography :

Aleksey Mickhailovich Polubotko graduated from Physical faculty of Leningrad State University in 1973. He completed his PhD in A.F. Ioffe Physi�?o-Technical Institute Russian Academy of Sciences and defended the PhD thesis in Azerbaijan Institute of Physics in Baku in 1983. Currently, he works as a physicist theorist and a senior scientific researcher of the sector of semi-conductors and Dielectrics of the Department of Dielectrics and Semiconductors of A F Ioffe Physico- Technical Institute in Saint Petersburg. He has more than 120 scientific papers, preprints and abstracts published in reputed journals and reported on many scientific conferences.

Email: alex.marina@pop.ioffe.rssi.ru