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How is Raman scattering intensity enhanced?

How is Raman scattering intensity enhanced?

Enhanced (or near-field) Raman spectroscopy Enhancement of Raman scattering is achieved by local electric-field enhancement by optical near-field effects (e.g. localized surface plasmons). Surface-enhanced Raman spectroscopy (SERS) – Normally done in a silver or gold colloid or a substrate containing silver or gold.

What is Surface-Enhanced Resonance Raman spectroscopy?

Surface-enhanced resonance Raman scattering (SERRS) is a sensitive and selective method for the characterization of sites in biomolecules, which have an electronic transition at energy close to or coincident with the laser frequency used.

What is resonance enhancement?

Resonance Raman spectroscopy is a Raman enhancement technique in which the laser excitation frequency is chosen to be close to the frequency of an electronic transition of the sample. Resonance Raman can enhance the Raman scattering intensity by a factor of 102-106 and improves signal-to-noise.

How does resonance Raman work?

In resonance Raman spectroscopy, the wavelength of the incoming photons coincides with an electronic transition of the molecule or material. Electronic excitation of a molecule results in structural changes which are reflected in the enhancement of Raman scattering of certain vibrational modes.

How does surface enhanced Raman work?

Surface-enhanced Raman scattering, or SERS, is a commonly used sensing technique in which inelastic light scattering (Figure 1) by molecules is greatly enhanced (by factors up to 108 or even larger, enabling single-molecule (SM) SERS in some cases) when the molecules are adsorbed onto corrugated metal surfaces such as …

How does tip enhanced Raman spectroscopy work?

Introduction. Tip-enhanced Raman spectroscopy (TERS) combines the chemical sensitivity of surface-enhanced Raman spectroscopy (SERS) with high spatial resolution of scanning probe microscopy (SPM) and enables chemical imaging of surfaces at the nanometre length-scale.

What is the difference between Raman spectroscopy and resonance Raman spectroscopy?

Resonance Raman spectroscopy has greater sensitivity compared to its non-resonance counterpart. It is capable of analyzing samples with concentrations as low as 10-8 M. Non-resonance Raman can analyze samples with concentrations no lower than 0.1 M.

On which phenomenon surface enhanced Raman scattering is based?

The physical process, known as surface-enhanced Raman scattering (SERS), is based on charges in the metal that oscillate at the same optical frequencies as the Raman scattered light from the sample when the two are bound or in close proximity to one another.

What do you mean by resonance Raman spectroscopy?

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