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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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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...
311
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...
296
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

922
Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
922
NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

673
When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
673
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

1.2K
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...
1.2K
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.0K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.0K

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Updated: Jun 7, 2025

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
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Lineshape of Amplitude-Modulated Stimulated Raman Spectra.

Marco Lamperti1, Lucile Rutkowski2, Guglielmo Vesco3

  • 1Dipartimento di Scienza e Alta Tecnologia, Università Degli Studi dell'Insubria, 22100 Como, Italy.

Sensors (Basel, Switzerland)
|November 9, 2024
PubMed
Summary

This study introduces a new tool to correct spectral distortions in nonlinear spectroscopy caused by amplitude modulation. This method ensures accurate measurements of spectral lineshapes and positions for molecular hydrogen.

Keywords:
Stimulated Raman Scatteringamplitude modulationmolecular hydrogenoptical metrologyspectral lineshape

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Area of Science:

  • Spectroscopy
  • Quantum Optics
  • Molecular Physics

Background:

  • Nonlinear spectroscopies commonly use amplitude modulation to improve detection sensitivity.
  • High modulation frequencies can distort spectral lineshapes, complicating accurate measurements.
  • Accurate spectral metrology is crucial for understanding molecular properties, as demonstrated by recent work on molecular hydrogen.

Purpose of the Study:

  • To develop an analytical tool for quantifying spectral distortions in nonlinear Stimulated Raman spectroscopies.
  • To enable the deconvolution of these distortions for unbiased spectral data retrieval.
  • To address challenges in precise spectral lineshape and position measurements.

Main Methods:

  • Development of an analytical framework to model spectral distortions.
  • Application of the tool to nonlinear Stimulated Raman spectroscopy.
  • Deconvolution of distortions from experimental spectra.

Main Results:

  • A method to precisely quantify spectral distortions caused by amplitude modulation was developed.
  • The tool allows for the retrieval of unbiased spectral lineshapes and positions.
  • Demonstrated application to correcting spectra from molecular hydrogen metrology.

Conclusions:

  • The developed analytical tool effectively corrects spectral distortions in nonlinear spectroscopy.
  • This advancement facilitates more accurate spectral measurements, particularly for challenging molecular systems.
  • The findings have significant implications for precision spectroscopy and metrology.