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Related Concept Videos

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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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...
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IR Spectrometers01:25

IR Spectrometers

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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Applications of IR Spectroscopy: Overview01:11

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The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...
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Infrared (IR) Spectroscopy: Overview01:09

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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
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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...
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Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems
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Novel Probe for Thermally Controlled Raman Spectroscopy Using Online IR Sensing and Emissivity Measurements.

Chiara Calvagna1, Andrea Azelio Mencaglia1, Iacopo Osticioli1

  • 1Istituto di Fisica Applicata "Nello Carrara"-Consiglio Nazionale delle Ricerche (IFAC-CNR), 50019 Florence, Italy.

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Summary

This study introduces a novel probe for portable Raman spectroscopy that monitors and controls sample temperature in real-time. This innovation prevents photothermal damage, ensuring accurate material characterization.

Keywords:
IR sensorRaman spectroscopyemissivitylaser heatingpigment

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Spectroscopy

Background:

  • Laser excitation in Raman spectroscopy can cause undesirable temperature increases.
  • Photothermal effects can alter material properties and compromise spectral analysis.
  • Accurate temperature monitoring is crucial for preserving sample integrity during spectroscopic analysis.

Purpose of the Study:

  • To develop an innovative probe for thermally controlled portable Raman spectroscopy.
  • To integrate real-time temperature measurement capabilities into a Raman spectroscopy setup.
  • To mitigate photothermal side effects during material characterization.

Main Methods:

  • Development of a portable Raman probe with integrated infrared sensing lines.
  • Inclusion of an infrared source and two thermopile sensors for emissivity measurement.
  • Real-time monitoring of local surface emissivity under laser excitation.
  • Integration of total reflectance, temperature, and Raman spectroscopy measurements.

Main Results:

  • The probe successfully performed real-time measurements of local emissivity.
  • The reliability of derived emissivity for various materials was independently assessed.
  • The probe was effectively applied to analyze pigments, paint layers, and a painting on canvas.
  • Demonstrated significant potential for the novel tool in practical applications.

Conclusions:

  • The developed probe enables effective thermal control during portable Raman spectroscopy.
  • Real-time emissivity and temperature monitoring prevent photothermal damage to samples.
  • The integrated system offers a promising solution for accurate material characterization in diverse applications.