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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.
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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

IR Spectrum

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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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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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IR Spectroscopy: Molecular Vibration Overview01:24

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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.
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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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Optimal Spectral Resolution for Infrared Studies of Solids and Liquids.

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Summary

This study challenges the long-held practice of using only powers of two for spectroscopic resolution in Fourier transform infrared spectroscopy. Researchers found that an optimized resolution of 6.0 cm⁻¹ balances signal-to-noise and acquisition time for liquids and solids.

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FT-IRFourier transform infraredInfraredspectral resolution

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Area of Science:

  • Spectroscopy
  • Analytical Chemistry
  • Physical Chemistry

Background:

  • Historically, spectroscopic resolution in Fourier transform infrared spectroscopy (FTIR) and similar systems has been limited to powers of two (e.g., 2, 4, 8, 16 cm⁻¹) due to early computer limitations.
  • This legacy practice has persisted for over 50 years, potentially impacting data quality and acquisition efficiency.

Purpose of the Study:

  • To investigate and debunk the convention of using only powers of two for spectroscopic resolution.
  • To determine the optimal spectroscopic resolution that balances signal-to-noise ratio and efficient acquisition time for condensed-phase samples.
  • To provide data-driven recommendations for spectroscopic resolution in FTIR and related techniques.

Main Methods:

  • Analysis of 61 liquids and 70 solids reference spectra within the 4000-400 cm⁻¹ range, all recorded at 2.0 cm⁻¹ resolution.
  • Examination of 4237 spectral peaks to determine their widths and whether they are singlets or multiplets.
  • Statistical analysis of peak width distributions for both liquid and solid samples.

Main Results:

  • The study found a skewed distribution of peak widths for both liquids and solids, with median widths significantly narrower than the mean (13.7 cm⁻¹ for liquids, 11.2 cm⁻¹ for solids).
  • A resolution of 5.7 cm⁻¹ for liquids and 5.3 cm⁻¹ for solids is required to capture 95% of all bands, preserving native linewidths.
  • An optimized resolution of 6.0 cm⁻¹ was found to capture 91% of all condensed-phase bands, offering a significant gain in signal-to-noise with minimal loss of specificity.

Conclusions:

  • The traditional use of powers of two for spectroscopic resolution is not optimal for capturing the full information content of liquid and solid spectra.
  • An optimized resolution around 6.0 cm⁻¹ provides a practical balance between spectral detail, signal-to-noise ratio, and acquisition efficiency.
  • This research suggests a shift towards more flexible and optimized resolution settings in spectroscopic analysis.