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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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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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Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

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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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Atomic Emission Spectroscopy: Overview01:20

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Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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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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Mass Analyzers: Common Types01:19

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The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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Parallel Accelerated Electron Paramagnetic Resonance Spectroscopy Using Diamond Sensors.

Zhehua Huang1,2, Zhengze Zhao1,2, Fei Kong1,2,3

  • 1University of Science and Technology of China, CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences, Hefei 230026, China.

Physical Review Letters
|April 18, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a new zero-field electron paramagnetic resonance (EPR) method using nitrogen-vacancy (NV) centers. This technique overcomes sensor and target inhomogeneities for sensitive magnetic sensing and real-time free radical monitoring.

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Area of Science:

  • Quantum Sensing
  • Magnetic Resonance Spectroscopy
  • Materials Science

Background:

  • Nitrogen-vacancy (NV) centers in diamond are atomic-scale magnetic sensors.
  • NV centers offer high magnetic-field sensitivity for electron paramagnetic resonance (EPR) measurements.
  • Existing NV ensemble EPR methods suffer from sensor and target inhomogeneities, limiting spectral resolution.

Purpose of the Study:

  • To develop a novel EPR spectroscopy method robust to sensor and target inhomogeneities.
  • To enhance the efficiency and resolution of EPR measurements using NV ensembles.
  • To enable real-time monitoring of free radical dynamics.

Main Methods:

  • Implementation of cross-relaxation EPR spectroscopy at zero magnetic field.
  • Utilizing an amplitude-modulated control field to tune NV sensor resonance.
  • Demonstration with an ensemble of approximately 30,000 NV centers.

Main Results:

  • Achieved robust EPR detection despite sensor inhomogeneity through modulation.
  • Zero-field EPR inherently compensated for target inhomogeneity.
  • Successfully acquired unambiguous EPR spectra of free radicals.
  • Demonstrated real-time monitoring of spectroscopic dynamics.

Conclusions:

  • The developed cross-relaxation EPR method significantly improves sensitivity and robustness.
  • This technique overcomes limitations of traditional NV ensemble EPR spectroscopy.
  • Enables advanced applications in studying free radicals and dynamic processes.