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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

480
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...
480
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

470
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...
470
NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

740
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...
740
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

1.1K
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...
1.1K
2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

238
Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
238
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

245
Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
245

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Related Experiment Video

Updated: Jul 28, 2025

Direct Comparison of Hyperspectral Stimulated Raman Scattering and Coherent Anti-Stokes Raman Scattering Microscopy for Chemical Imaging
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Rapid Vector-Based Peak Fitting and Resolution Enhancement for Correlation Analyses of Raman Hyperspectra.

H Georg Schulze1, Shreyas Rangan2,3, Martha Z Vardaki4

  • 1Independent, Monte do Tojal, Hortinhas, Terena, Portugal.

Applied Spectroscopy
|May 31, 2023
PubMed
Summary

A new algorithm rapidly enhances spectral resolution by fitting peaks, improving analysis of complex hyperspectral data for applications like manufacturing process control.

Keywords:
2D-COSGaussian distributionsPCARaman spectroscopycorrelation structuremammalian cellspeak fittingprincipal component analysisresolution enhancementtwo-dimensional correlation spectroscopy

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Data Science

Background:

  • Spectroscopic peak parameters are crucial for analyte characterization and resolving overlapped peaks.
  • Accurate peak fitting is computationally challenging, especially for large hyperspectral datasets and unknown analytes.
  • Current limitations hinder rapid analysis required for applications like manufacturing process control.

Purpose of the Study:

  • To develop a novel, fast algorithm for peak fitting and spectral resolution enhancement.
  • To enable rapid processing of large hyperspectral datasets.
  • To improve correlation-based analyses by constructing higher-resolution spectra.

Main Methods:

  • A two-part algorithm was developed for peak fitting and resolution enhancement.
  • The first part estimates spectral band parameters from a representative spectrum.
  • The second part iteratively fits all spectra using Gaussian bands and vector operations, then enhances resolution.

Main Results:

  • The algorithm successfully recovered ground truth correlations in synthetic spectra with highly overlapped peaks.
  • Application to glucose spectra demonstrated effective peak resolution enhancement.
  • Processing of mammalian cell spectral data showed improved resolution for complex spectra.

Conclusions:

  • The developed algorithm provides a fast method for obtaining high-resolution spectra.
  • It enhances spectral resolution, improving correlation-based analyses.
  • The algorithm facilitates recovery of intrinsic correlation structures in complex spectral data.