A localized surface plasmon resonance (LSPR) scattering spectroscopy peak is obtained in dispersion of nanoparticles due to collective oscillations of free electrons of nanoparticles. The laser beam interacts with the collective electrons of the nanoparticle surface. In metals, electrons belong to all atoms. Therefore, they say that they are delocalized or collective. In nanoparticles of magnetite (iron oxide), the bond is covalent. The electrons of this bond are localized near their atoms.

The light scattering theory for non-incident light particles, for example, magnetite, was developed by Rayleigh. Scattering is possible only if the inhomogeneities are at distances from each other greater than the wavelength of the laser. The inhomogeneities themselves should be smaller than the wavelength. The intensity of light scattering is proportional to the square of the particle's рolarizability and, accordingly, to the square of the volume of the particle.

Further to Yuri's answer, please find attached a review paper. Hopefully you'll find the theory section useful as well as the collection of references.

Kind regards,

Jules

Article Localized Surface Plasmon Resonance as a Biosensing Platform...

In localized surface plasmon resonance, light interacts with the free electrons present in the nanoparticles. In this situation light gets absorbed by the nanoparticles when the frequency of light is equal to the plasma frequency of electrons present in the nanoparticles. Only certain band of light is absorbed due to resonance.

In scattering light is absorbed by the particles interacting with light followed by emission of light. Scattering also depends on the particle size and the wavelength of the light.

Thank You all Prof Rai, Hammond, Mirgoroud. I got your points but one thing i wanna know is there any difference in absorption patteren of Scattering and LSPR?

I have absorption data of Ag film which has been evaporated from 1-9nm as this is this is very thin film it's not like film rather it would be nano-particles but i am confused whether it's Scattering or LSPR?

Attached file is Absorption data

Dear Azmat

Thin film of up to 10 nm thickness will be in the form of nanoisland (nanoparticles). This film will not be continuous. Such film of silver provides localized surface plasmon resonance peak near 400 nm. However the peak position and its broadenning increase due to increase in the nanoparticle size as you increase the film thickness from 1 to 10 nm. I have seen your absorption spectra of silver thin films. It clearly shows the LSPR peaks shifting to higher wavelength with an increase in its broadenning.

Thanks Prof Rai i got your point and i know in what context you said it

But still i have no solid evidence to prove it whether it's scattering phenomena or LSPR