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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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Atomic Absorption Spectroscopy: Interference01:25

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Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
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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.
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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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Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
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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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Interfacial Inversion, Interference, and IR Absorption in Vibrational Sum Frequency Scattering Experiments.

S Pullanchery1, L Zhang1, S Kulik1

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Vibrational sum frequency scattering (SFS) spectroscopy reveals distinct molecular interfacial structures. Different stabilization mechanisms, like steric versus charge, create unique interfacial arrangements even with the same chemicals.

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Area of Science:

  • Surface science
  • Spectroscopy
  • Colloid science

Background:

  • Molecular interfacial structure dictates nano- and microscale system properties.
  • Vibrational sum frequency scattering (SFS) spectroscopy is an interface-selective technique for analyzing vibrational spectra of dispersed objects.
  • Interfacial structure is derived from interfacial susceptibility, a property obtained from spectral intensity.

Purpose of the Study:

  • To investigate the impact of infrared absorption in complex bulk media on SFS measurements.
  • To analyze the effects of interfacial phase inversion, interference, and absorption on interfacial structure determination.
  • To explore how different stabilization mechanisms influence interfacial structure.

Main Methods:

  • Utilized vibrational sum frequency scattering (SFS) spectroscopy.
  • Employed hexadecane oil, water, and Span80 surfactant as model system components.
  • Analyzed the influence of infrared absorption and interfacial phase on spectral data.

Main Results:

  • Effective surface susceptibility was successfully retrieved from spectral intensity for all systems.
  • Phase inversion led to different interfacial structures, attributed to steric stabilization (water-in-oil) versus charge stabilization (oil-in-water).
  • Interfacial interference patterns were found to be useful for estimating the surface density of interfacial compounds.

Conclusions:

  • SFS spectroscopy effectively probes interfacial structure and composition.
  • The nature of interfacial stabilization significantly impacts molecular arrangement.
  • Interfacial interference offers a quantitative method for assessing surface density in complex dispersions.