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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 Spectrum01:19

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When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
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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.
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IR Frequency Region: Fingerprint Region01:03

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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 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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UV–Vis Spectrometers01:14

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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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Extracting the sample response function from experimental two-dimensional terahertz-infrared-visible spectra.

Pankaj Seliya1, Mischa Bonn1, Maksim Grechko1

  • 1Department of Molecular Spectroscopy, Max Planck Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany.

The Journal of Chemical Physics
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Summary
This summary is machine-generated.

This study introduces a new method to accurately measure terahertz molecular motions by removing laser pulse artifacts from spectroscopic data. This technique provides a clearer understanding of molecular vibrations and material properties.

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Area of Science:

  • Molecular Spectroscopy
  • Terahertz Spectroscopy
  • Vibrational Dynamics

Background:

  • Terahertz molecular motions are typically studied using non-linear vibrational spectroscopy.
  • Two-dimensional terahertz-infrared-visible spectroscopy enables direct measurement of couplings for site-specific terahertz spectra.
  • Experimental terahertz-infrared-visible spectroscopy data can be influenced by laser pulse intensity and phase.

Purpose of the Study:

  • To develop a method for extracting material-specific responses from experimental terahertz-infrared-visible spectroscopy data.
  • To eliminate the influence of laser pulse characteristics on spectral analysis.
  • To obtain accurate site-specific terahertz vibrational spectra.

Main Methods:

  • Development of a novel data processing technique to isolate sample response.
  • Utilizing dimethyl sulfoxide as a model compound for method validation.
  • Measurement of couplings between specific molecular vibrations.

Main Results:

  • A method was successfully developed and verified for extracting intrinsic sample properties from complex spectroscopic data.
  • The coupling between methyl group C-H stretch vibrations and terahertz intramolecular twist and wagging modes in dimethyl sulfoxide was quantified.
  • The technique effectively removes artifacts caused by laser pulse intensity and phase variations.

Conclusions:

  • The developed method enables accurate determination of terahertz molecular motions and vibrational couplings.
  • This approach enhances the reliability of site-specific terahertz vibrational spectroscopy.
  • The findings provide a more precise way to investigate the physical properties of materials through their terahertz response.