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Related Concept Videos

Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

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.
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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.
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Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
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Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

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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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

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Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR
10:54

Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR

Published on: February 23, 2016

A 200 GHz dynamic nuclear polarization spectrometer.

Brandon D Armstrong1, Devin T Edwards, Richard J Wylde

  • 1Department of Physics, University of California, Santa Barbara, USA.

Physical Chemistry Chemical Physics : PCCP
|May 13, 2010
PubMed
Summary

We enhanced dynamic nuclear polarization (DNP) signal detection by 28% using circularly polarized 200 GHz microwaves. This setup achieved a 65x signal enhancement in a (13)C urea sample at 4 K.

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Area of Science:

  • Magnetic Resonance Spectroscopy
  • Physical Chemistry
  • Materials Science

Background:

  • Dynamic Nuclear Polarization (DNP) enhances nuclear spin polarization for improved sensitivity in Magnetic Resonance.
  • Electron Paramagnetic Resonance (EPR) spectroscopy is crucial for studying paramagnetic species.
  • High-field (7 T) and low-temperature (4 K) conditions are often required for advanced DNP-EPR experiments.

Purpose of the Study:

  • To present an experimental setup for DNP and EPR detection at 7 T using a 200 GHz quasi-optical bridge.
  • To investigate the effect of microwave polarization (linear vs. circular) on DNP signal enhancement.
  • To report initial results and assess the sensitivity gains achievable with this setup.

Main Methods:

  • Development of a quasi-optical bridge for 200 GHz microwave propagation, enabling control over beam polarization (linear to circular).
  • Integration of the quasi-optical bridge with a 7 T Electron Paramagnetic Resonance (EPR) spectrometer for simultaneous DNP and EPR measurements.
  • Characterization of DNP signal enhancement using a 13C labeled urea sample at 4 K under varying microwave polarization conditions.

Main Results:

  • Demonstrated the ability to switch microwave polarization from linear to circular using the quasi-optical bridge.
  • Observed a 28% increase in DNP signal enhancement with circularly polarized microwaves compared to linearly polarized microwaves.
  • Achieved a maximum signal enhancement of 65 times thermal polarization for a 13C labeled urea sample, corresponding to 3% nuclear spin polarization.
  • Noted that nuclear spin polarization buildup during microwave irradiation was 10 times faster than the 13C nuclear spin T(1) relaxation time.

Conclusions:

  • Circularly polarized microwaves offer a significant advantage for DNP signal enhancement due to preferential absorption by electron spins.
  • The developed 7 T DNP-EPR setup with a quasi-optical bridge provides enhanced detection sensitivity.
  • This technique holds promise for more sensitive studies of various spin systems using Magnetic Resonance.