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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

1.0K
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...
723
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

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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...
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IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

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When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
4.0K
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

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A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to...
2.4K
UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

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Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is the extent of conjugation in...
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Comparability of Raman Spectroscopic Configurations: A Large Scale Cross-Laboratory Study.

Shuxia Guo1,2, Claudia Beleites2,3, Ute Neugebauer1,2,4

  • 1Institute of Physical Chemistry and Abbe Center of Photonics, University Jena, 07743 Jena, Germany.

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Instrumental configuration variability hinders Raman spectroscopy for clinical diagnostics. A round robin experiment revealed significant spectral variations across 35 devices, impacting data comparability and model development.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Biomedical Engineering

Background:

  • Raman spectroscopy offers valuable physicochemical insights but faces challenges in real-world clinical diagnostics due to variable instrument configurations.
  • Inconsistent spectral data across different Raman setups impede the development of robust diagnostic models applicable across diverse clinical environments.
  • Understanding and mitigating instrumental dependence is crucial for establishing Raman spectroscopy as a reliable diagnostic tool.

Purpose of the Study:

  • To investigate the comparability of diverse Raman spectroscopic devices with varying configurations.
  • To quantify spectral variations (peak shifts, intensity, width, noise) arising from different instrumental setups.
  • To provide recommendations for improving inter-laboratory studies and spectral data consistency in Raman spectroscopy.

Main Methods:

  • Conducted a round robin experiment involving 35 Raman spectroscopic devices from 15 institutions across seven European countries.
  • Included a wide range of instrumental configurations, from confocal to fiber-optic systems with different excitation wavelengths.
  • Analyzed spectral variations focusing on peak shifts, intensity fluctuations, peak broadening, and noise levels.

Main Results:

  • Significant spectral variations were observed across the 35 evaluated Raman spectroscopic devices.
  • Instrumental configurations demonstrably influenced peak positions, signal intensity, peak width, and overall noise levels.
  • The experiment highlighted the lack of spectral consistency, posing a challenge for cross-platform data analysis and model transferability.

Conclusions:

  • Instrumental variability is a major obstacle for the widespread adoption of Raman spectroscopy in clinical diagnostics.
  • Standardization and correction strategies are essential to ensure reproducible and comparable Raman spectral data across different setups.
  • Recommendations are proposed to enhance inter-laboratory collaboration and improve the reliability of Raman spectroscopic measurements.