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Related Concept Videos

Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

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...
IR Spectrometers01:25

IR Spectrometers

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...
Applications of IR Spectroscopy: Overview01:11

Applications of IR Spectroscopy: Overview

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,...
IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

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...

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Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
10:42

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Published on: March 22, 2019

Infrared microcalorimetric spectroscopy using quantum cascade lasers.

M E Morales-Rodríguez1, L R Senesac, S Rajic

  • 1Oak Ridge National Laboratory, Oak Ridge, Tennessee 37931-6054, USA.

Optics Letters
|March 5, 2013
PubMed
Summary
This summary is machine-generated.

This study introduces IR microcalorimetric spectroscopy for detecting trace molecules. The technique uses wavelength-specific infrared light absorption by molecules on uncooled detectors, offering a label-free chemical detection method.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Nanoscience

Background:

  • Trace molecule detection is crucial for various applications, including environmental monitoring and security.
  • Existing methods often require specific chemical coatings or complex sample preparation.
  • Infrared (IR) spectroscopy is a powerful tool for molecular identification based on vibrational modes.

Purpose of the Study:

  • To develop and demonstrate a novel IR microcalorimetric spectroscopy technique for sensitive and specific trace molecule detection.
  • To show that this method can identify molecules without chemical-specific coatings.
  • To validate the technique by analyzing known chemical compounds.

Main Methods:

  • Utilizing uncooled thermal micromechanical detectors to measure photothermal effects.
  • Employing tunable quantum cascade lasers to probe specific IR absorption bands.
  • Adsorbing target molecules onto detector surfaces and analyzing their IR photothermal spectra.

Main Results:

  • Successfully obtained IR photothermal spectra for trace concentrations of 1,3,5-Trinitroperhydro-1,3,5-triazine.
  • Demonstrated detection of a monolayer of 2-Sulfanylethan-1-ol (2-mercaptoethanol).
  • Observed photothermal absorption features that closely match the known IR spectra of the analytes.

Conclusions:

  • IR microcalorimetric spectroscopy is a viable technique for label-free trace chemical detection.
  • The method's specificity arises from the inherent vibrational properties of molecules and tunable laser sources.
  • This approach offers a promising alternative for sensitive chemical sensing applications.