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Related Concept Videos

Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

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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: 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...
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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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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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IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
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Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
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Time-domain spectroscopy in the mid-infrared.

A A Lanin1, A A Voronin1, A B Fedotov1

  • 11] Physics Department, International Laser Center, M.V. Lomonosov Moscow State University, Moscow 119992, Russia [2] Russian Quantum Center, ul. Novaya 100, Skolkovo, Moscow Region, 1430125 Russia.

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Researchers developed a new mid-infrared spectroscopy method using ultrafast laser pulses to precisely measure molecular vibrations. This technique overcomes limitations in current detectors, enabling detailed chemical analysis across various scientific fields.

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Area of Science:

  • Physics
  • Chemistry
  • Biology
  • Geosciences
  • Medicine

Background:

  • Electromagnetic fields probe molecular vibrations for chemically specific studies.
  • Mid-infrared spectroscopy is challenging due to limitations in detectors and spectrometers.

Purpose of the Study:

  • To extend time-domain techniques for metrology of molecular motions in the mid-infrared.
  • To overcome current limitations in mid-infrared spectroscopic measurements.

Main Methods:

  • Utilizing advanced ultrafast technologies and nonlinear-optical waveform characterization.
  • Inducing spectral modulation of ultrashort mid-infrared pulses via molecular rovibrational motions.
  • Generating visible light through ultrabroadband four-wave mixing in a gas phase.

Main Results:

  • Coherent dark waveforms arise in the time domain from spectral modulation.
  • High-visibility interference patterns are observed.
  • Cross-correlation frequency-resolved gating reads out the interference patterns.

Conclusions:

  • Time-domain techniques are advantageously extended to mid-infrared molecular motion metrology.
  • This method offers a sensitive and informative approach for chemical studies.
  • Overcomes limitations of traditional mid-infrared spectroscopy.