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Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

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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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The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
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AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and signal-to-noise ratio for the analyte. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.
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Development of phase-cycling interface-specific two-dimensional electronic sum frequency generation (2D-ESFG)

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  • 1Department of Chemistry and Biochemistry, Utah State University, Logan, Utah 84322, USA.

The Journal of Chemical Physics
|September 18, 2024
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We developed phase-cycling two-dimensional electronic sum-frequency generation (2D-ESFG) spectroscopy, a novel technique for studying interfacial electronic properties. This method precisely quantifies energy and charge transfer at surfaces and interfaces.

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Area of Science:

  • Nonlinear spectroscopy
  • Surface science
  • Physical chemistry

Background:

  • Two-dimensional electronic spectroscopy (2D-ES) is crucial for understanding energy transfer and electronic coupling.
  • Standard 2D-ES lacks the surface specificity needed to analyze interfacial electronic phenomena.
  • A need exists for techniques that provide detailed electronic information at surfaces and interfaces.

Purpose of the Study:

  • To develop and implement a phase-cycling two-dimensional electronic sum-frequency generation (2D-ESFG) spectroscopy technique.
  • To extend 2D-ES capabilities for surface and interfacial specificity.
  • To provide a detailed guide for researchers to implement and adapt this advanced spectroscopic method.

Main Methods:

  • Utilized an acousto-optic pulse shaper in a pump-probe geometry for 2D-ESFG spectroscopy.
  • Enabled rapid scanning, phase cycling, and separation of rephasing/nonrephasing signals.
  • Improved experimental efficiency by collecting data in a rotating frame.

Main Results:

  • Successfully demonstrated phase-cycling 2D-ESFG spectroscopy for azo-derivative molecules at the air/water interface.
  • The technique allows for precise quantification of interfacial energy and charge transfer.
  • The developed method shows potential for broad applicability to various interfaces and surfaces.

Conclusions:

  • Phase-cycling 2D-ESFG spectroscopy is a powerful, versatile tool for interfacial electronic studies.
  • This technique offers enhanced precision and ease of use for analyzing electronic properties and dynamics at surfaces.
  • The detailed methodology presented facilitates broader adoption and innovation in surface-specific nonlinear spectroscopy.