Mechanisms of resonant low frequency Raman scattering from metallic nanoparticle Lamb modes

The Journal of Chemical Physics
A GirardA Mermet

Abstract

The low frequency Raman scattering from gold nanoparticle bimodal assemblies with controlled size distributions has been studied. Special care has been paid to determining the size dependence of the Raman intensity corresponding to the quadrupolar Lamb mode. Existing models based on a microscopic description of the scattering mechanism in small particles (bond polarizability, dipole induced dipole models) predict, for any Raman-active Lamb modes, an inelastic intensity scaling as the volume of the nanoparticle. Surprisingly experimental intensity ratios are found to be anomalously much greater than theoretical ones, calling into question this scaling law. To explain these discrepancies, a simple mechanism of Raman scattering, based on the density fluctuations in the nanoparticles induced by the Lamb modes, is introduced. This modeling, in which the nanoparticle is described as an elastic isotropic continuous medium-as in Lamb theory, successfully explains the major features exhibited by low frequency Raman modes. Moreover this model provides a unified picture for any material, suitable for handling both small and large size ranges, as well as non-resonant and resonant excitation conditions in the case of metallic species.

References

Oct 1, 1995·Physical Review. B, Condensed Matter·M Montagna, R Dusi
Sep 1, 1992·Physical Review. B, Condensed Matter·E Duval
Jul 15, 2003·Physical Review Letters·M H KuokZ K Wang
Sep 14, 2006·Nano Letters·Jeremie MargueritatLucien Saviot
Sep 27, 2008·Proceedings of the National Academy of Sciences of the United States of America·H PortalesM-P Pileni
Apr 16, 2009·Nano Letters·Holger LangeChristian Thomsen
Sep 11, 2009·Nano Letters·Nicolas LargeJavier Aizpurua
Feb 26, 2013·Nano Letters·Yanyuan ZhaoQihua Xiong
Jan 23, 2016·Nano Letters·Shengxi HuangMildred S Dresselhaus

❮ Previous
Next ❯

Citations

Jan 11, 2018·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Wei Hu, Xinrui Cao
May 2, 2018·Nano Letters·Adrien GirardJérémie Margueritat

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.

Related Papers

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
Eric C DykemanKong-Thon Tsen
Physical Review C: Nuclear Physics
E F Redish, K Stricker-Bauer
Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
Xiu-Feng LangLin Guo
Physical Review. B, Condensed Matter
F CalleK Ploog
© 2022 Meta ULC. All rights reserved