Some notions about sehr spectra of crystal violet

TL;DR

This paper reviews vibrational spectra of crystal violet, questioning previous assignments and emphasizing the role of strong dipole and quadrupole interactions in surface-enhanced optical processes like SEHRS.

Contribution

It offers a critical analysis of existing vibrational spectra data and proposes that surface-enhanced Raman scattering involves significant dipole and quadrupole interactions.

Findings

Vibrational band assignments in CV are questionable.

Surface-enhanced optical processes involve strong dipole and quadrupole interactions.

Vibrational bands include contributions from various irreducible representations.

Abstract

The paper presents our opinion on the investigations and results of various kind of vibrational spectra of crystal violet (CV). After our analysis of the published spectra we came to conclusion, that the assignment of vibrations in this molecule remains questionable. Some experimental and calculations data permit us to conclude, that the vibrational bands in the SEHR spectra of CV contain the bands, caused by vibrations with and irreducible representations, that strongly confirm our idea about the main reason of surface enhanced optical processes and SEHRS in particular-the strong dipole and quadrupole light-molecule interactions.