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Related Concept Videos

Double Resonance Techniques: Overview01:12

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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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The role of the detectors in High-Performance Liquid Chromatography (HPLC) is to analyze the solutes as they exit from the chromatographic column. The detector recognizes the solute's property and generates corresponding electrical signals, which are converted into a readable graph of the detector's response versus elution time called a chromatogram at the computer. There are several types of HPLC detectors, each with its own advantages and limitations, depending on the analyte...
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Scanning-probe Single-electron Capacitance Spectroscopy
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Cryogenic single-chip electron spin resonance detector.

Gabriele Gualco1, Jens Anders1, Andrzej Sienkiewicz1

  • 1Ecole Polytechnique Federale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|September 28, 2014
PubMed
Summary
This summary is machine-generated.

We developed a compact single-chip electron spin resonance detector operating at 20 GHz. This device achieves high spin sensitivity from room temperature down to 4 K.

Keywords:
CMOSCryogenicESR

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Area of Science:

  • Physics
  • Electrical Engineering
  • Materials Science

Background:

  • Electron spin resonance (ESR) spectroscopy is a powerful technique for studying materials with unpaired electrons.
  • Miniaturization of ESR detectors is crucial for portable and in-situ applications.
  • Existing ESR detectors often require cryogenic temperatures and complex setups.

Purpose of the Study:

  • To design and characterize a novel single-chip electron spin resonance (ESR) detector.
  • To evaluate the performance of the detector across a wide temperature range (300 K to 4 K).
  • To assess the spin sensitivity of the developed ESR detector.

Main Methods:

  • Fabrication of a single-chip detector comprising an LC oscillator with a planar coil, metal-oxide-metal capacitor, and MOSFETs.
  • Characterization of the oscillator's frequency noise at 20 GHz from 300 K down to 4 K.
  • Measurement of spin sensitivity using a sample of 2,2-diphenyl-1-picrylhydrazyl (DPPH).

Main Results:

  • The single-chip ESR detector operates at approximately 20 GHz.
  • Frequency noise at 300 K is 20 Hz/Hz(1/2) at 100 kHz offset, improving to 1 Hz/Hz(1/2) at 10 kHz offset at 4 K.
  • Spin sensitivity is 10(8) spins/Hz(1/2) at 300 K, reaching 10(6) spins/Hz(1/2) at 4 K.

Conclusions:

  • A functional single-chip ESR detector has been successfully designed and characterized.
  • The detector exhibits excellent performance and sensitivity over a broad temperature range.
  • This technology holds promise for advanced ESR applications requiring compact and sensitive detectors.