Charge mechanism of low-frequency stimulated Raman scattering in virus suspensions

TL;DR

This paper proposes a physical mechanism based on dipole interactions for low-frequency stimulated Raman scattering in virus suspensions, supported by experimental data on tobacco mosaic virus, revealing potential for selective virus heating.

Contribution

It introduces a novel dipole interaction mechanism for virus scattering and demonstrates its implications for virus detection and targeted heating.

Findings

Stimulated spectral lines explained by dipole interactions.

Absence of lower-frequency lines linked to ion friction.

Potential for selective virus heating via optical parameters.

Abstract

A simple physical mechanism of stimulated light scattering on viruses in a water suspension (similar to Langmuir wave mechanism in plasma) is proposed. The proposed mechanism is based on the dipole interaction between the light wave and the inevitable uncompensated electrical charge on a virus in a water environment. Experimental data on tobacco mosaic virus are presented to support the proposed physical mechanism. It is demonstrated that stimulated amplification spectral line frequencies observed experimentally are well explained by the proposed mechanism. In particular, the absence of lower-frequency lines and the shifting of generation lines when the pH changes are due to ion friction in the ionic solution environment. The selection rules observed experimentally also confirm the dipole interaction type. It is shown that microwave radiation on virus acoustic vibrations frequency should appear under such scattering conditions. We demonstrate that such conditions also allow for local selective heating of viruses. This effect is controlled by the optical irradiation parameters and can be used to selectively affect a specific type of virus.