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Related Concept Videos

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

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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).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....
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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

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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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Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
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NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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NMR Spectrometers: Overview01:20

NMR Spectrometers: Overview

1.1K
NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
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Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

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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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Rapid Scan Electron Paramagnetic Resonance Opens New Avenues for Imaging Physiologically Important Parameters In Vivo
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Time-resolved electron paramagnetic resonance spectrometer based on ultrawide single-sideband phase-sensitive

Shixue Zhang1, Shengqi Zhou1, Jianqing Qi1

  • 1Center of Basic Molecular Science, Department of Chemistry, Tsinghua University, Beijing 100084, China.

The Review of Scientific Instruments
|August 4, 2023
PubMed
Summary

A new ultrawide single sideband phase sensitive detection (U-PSD) technique enhances time-resolved electron paramagnetic resonance (TREPR) sensitivity for detecting short-lived radicals. This method offers superior performance for studying complex photochemical systems and transient radical dynamics.

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Area of Science:

  • Physical Chemistry
  • Spectroscopy
  • Chemical Kinetics

Background:

  • Short-lived radicals are crucial intermediates in many chemical and biological processes.
  • Detecting transient radicals under thermal equilibrium requires high sensitivity and time resolution.
  • Conventional continuous-wave electron paramagnetic resonance (EPR) has limitations in resolving fast kinetic events.

Purpose of the Study:

  • To develop a novel time-resolved electron paramagnetic resonance (TREPR) method with enhanced sensitivity and time resolution.
  • To introduce and validate the ultrawide single sideband phase sensitive detection (U-PSD) technique for TREPR.
  • To enable the detection of short-lived radicals, including those in thermal equilibrium, over a wide timescale.

Main Methods:

  • Development of a U-PSD detection technique integrated with continuous-wave EPR.
  • Construction of a U-PSD TREPR spectrometer prototype incorporating laser flash excitation and precise timing control.
  • Application of the U-PSD TREPR to monitor transient radical systems, such as laser flash photolysis of benzophenone.

Main Results:

  • The U-PSD technique significantly enhanced sensitivity for broadband transient signals compared to direct detection.
  • The U-PSD TREPR spectrometer successfully detected both chemically induced dynamic electron polarization and thermal equilibrium EPR signals.
  • Observed signals spanned a wide timescale from sub-microsecond to milliseconds, demonstrating broad applicability.

Conclusions:

  • The U-PSD technique is a feasible and powerful advancement for TREPR spectroscopy.
  • This method provides superior performance for studying complex photochemical systems and transient radical dynamics.
  • U-PSD TREPR complements existing techniques, offering deeper mechanistic insights in areas like photoredox catalysis and artificial photosynthesis.