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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

2.6K
The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
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Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
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Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

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The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

1.3K
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
1.3K
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

1.7K
A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
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2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

1.3K
Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
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Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy
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Quadrupole-enhanced Raman scattering.

Simon P Hastings1, Pattanawit Swanglap, Zhaoxia Qian

  • 1Department of Physics, University of Pennsylvania , Philadelphia, Pennsylvania 19104, United States.

ACS Nano
|August 27, 2014
PubMed
Summary
This summary is machine-generated.

Spiky nanoshells enable highly reproducible and efficient Raman scattering enhancement. Their unique structure allows for tunable quadrupole resonances, improving applications in biosensing and nanoelectronics.

Keywords:
QERSRaman spectroscopySERSplasmon resonancequadrupole resonancespiky nanoshells

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Area of Science:

  • Plasmonics
  • Nanophotonics
  • Spectroscopy

Background:

  • Dark, nonradiating plasmonic modes are crucial for Raman enhancement in nanostructures.
  • Predictable control over plasmonic hotspots remains a synthetic challenge.

Purpose of the Study:

  • To demonstrate spiky nanoshells as a platform for efficient and reproducible Raman scattering enhancement.
  • To investigate the role of quadrupole resonances in enhancing Raman efficiency.

Main Methods:

  • Fabrication of spiky nanoshells with tunable geometry.
  • Characterization of plasmonic resonances using spectroscopy.
  • Measurement of Raman scattering enhancement at the single-particle level.

Main Results:

  • Spiky nanoshells exhibit designable quadrupole resonances.
  • Achieved unprecedented reproducibility in Raman enhancement at the single-particle level.
  • Heterogeneous structure broadens resonance spectrally and spatially, enhancing both excitation and Stokes frequencies.

Conclusions:

  • Spiky nanoshells offer tunable, efficient, and reproducible Quadrupole Enhanced Raman Scattering (QERS).
  • These nanoshells are promising for biosensing, nanoantennas, and photovoltaics.