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Related Concept Videos

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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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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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
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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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Microsecond Resolved Infrared Spectroelectrochemistry Using Dual Frequency Comb IR Lasers.

Erick Lins1, Stuart Read2, Bipinlal Unni1

  • 1Department of Chemistry, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5C9, Canada.

Analytical Chemistry
|April 3, 2020
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Dual frequency comb spectroscopy enables microsecond-resolved electrochemical surface analysis. This advanced technique achieves high spectral resolution and fractional monolayer detection limits for surface-enhanced infrared absorption spectroscopy (SEIRAS) experiments.

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Area of Science:

  • Spectroscopy
  • Electrochemistry
  • Surface Science

Background:

  • Electrochemical attenuated total reflectance surface-enhanced infrared absorption spectroscopy (ATR-SEIRAS) is crucial for studying interfacial processes.
  • Traditional methods like step-scan interferometry can be limited in time resolution.
  • Fast dynamic processes at electrode surfaces require advanced spectroscopic techniques.

Purpose of the Study:

  • To develop and demonstrate a time-resolved ATR-SEIRAS method using dual infrared frequency comb spectroscopy.
  • To achieve microsecond time resolution for electrochemical surface analysis.
  • To analyze the potential-dependent desorption of 4-dimethylaminopyridine (DMAP).

Main Methods:

  • Utilizing a dual infrared frequency comb spectrometer with heterodyne detection.
  • Performing time-resolved electrochemical attenuated total reflectance surface-enhanced infrared absorption spectroscopy (ATR-SEIRAS).
  • Measuring the desorption of a DMAP monolayer without step-scan interferometry.

Main Results:

  • Achieved time resolution as high as 4 μs for ATR-SEIRAS measurements.
  • Successfully measured the potential-dependent desorption of a DMAP monolayer.
  • Demonstrated that dual frequency comb spectroscopy is highly suitable for time-resolved ATR-SEIRAS.
  • Obtained microsecond-resolved spectra with high spectral resolution and fractional monolayer detection limits.

Conclusions:

  • Dual frequency comb spectroscopy significantly enhances the capabilities of time-resolved ATR-SEIRAS.
  • The method offers a substantial improvement in experimental duration compared to step-scan techniques.
  • This technique opens new avenues for ultrafast interfacial electrochemical studies.