|
This article is cited in 1 scientific paper (total in 1 paper)
Spectroscopy of condensed matter
Peculiarities of the sers spectra of 4,4'-bipyridine molecule in a single molecule detection regime
A. M. Polubotkoa, E. V. Solovyevab a A.F. Ioffe Physico-Technical Institute, St. Petersburg, 194021, Russia
b Institute of Chemistry, Saint Petersburg State University, Peterhof, St. Petersburg, 198504, Russia
Abstract:
The paper describes briefly main statements of the theory of the SERS spectra with regards to the single molecule regime, when the enhancement achieves the values $\sim$10$^{14}$–10$^{15}$. Analysis of the spectra of 4,4'-bypyridine, obtained on the dimer lattice of sharp nanoparticles points out that the observed enhancement is caused exclusively by a strong quadrupole light-molecule interaction, which manifests in the presence of lines, caused by vibrations with the unit irreducible representations of the $D_2$ and $D_{2h}$ symmetry groups, which apparently describe the symmetry properties of the molecule. The study of the spectra, obtained by tip enhanced spectroscopy demonstrates that the strong quadrupole light-molecule interaction still has a governing role, however the strong dipole interaction still manifests in the existence of very weak forbidden lines. This result apparently is associated with another experimental geometry.
Received: 11.05.2017
Citation:
A. M. Polubotko, E. V. Solovyeva, “Peculiarities of the sers spectra of 4,4'-bipyridine molecule in a single molecule detection regime”, Optics and Spectroscopy, 124:1 (2018), 45–50; Optics and Spectroscopy, 124:1 (2018), 43–48
Linking options:
https://www.mathnet.ru/eng/os1089 https://www.mathnet.ru/eng/os/v124/i1/p45
|
|