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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

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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Related Experiment Video

Updated: Jul 2, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

A microprocessor-controlled photon counter for pulsed optically detected magnetic resonance.

R K Power1, A M Nishimura

  • 1Department of Chemistry, Wichita State University, Wichita, Kansas 67208, USA.

The Review of Scientific Instruments
|August 1, 1979
PubMed
Summary

A novel multiaccumulator photon counter enables sequential photon counting for pulsed optically detected magnetic resonance (ODMR) spectroscopy. This inexpensive device overcomes limitations of traditional methods, enhancing ODMR experiments.

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Last Updated: Jul 2, 2026

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Area of Science:

  • Quantum Optics and Spectroscopy
  • Materials Science
  • Physical Chemistry

Background:

  • Pulsed optically detected magnetic resonance (ODMR) spectroscopy requires precise signal monitoring.
  • Traditional lock-in amplifiers struggle with large amplitude-modulated background signals in pulsed ODMR.
  • Commercially available photon counters have limitations for the sequential counting needed in pulsed ODMR.

Purpose of the Study:

  • To develop an improved photon counter for pulsed optically detected magnetic resonance (ODMR) spectroscopy.
  • To address the challenges posed by background noise and sequential counting requirements in pulsed ODMR.
  • To create an affordable and versatile instrument for advanced spectroscopic applications.

Main Methods:

  • Design and implementation of a multiaccumulator photon counter.
  • Integration of a microprocessor for algebraic manipulation of photon counts.
  • Capability for sequential photon counting over up to four time intervals.

Main Results:

  • The developed multiaccumulator photon counter successfully performs sequential photon counting.
  • It effectively handles the challenges of pulsed ODMR signal acquisition.
  • The device is demonstrated to be inexpensive and versatile.

Conclusions:

  • The multiaccumulator photon counter is well-suited for pulsed ODMR applications.
  • This instrument offers a cost-effective solution for experiments requiring sequential photon counting.
  • The technology has potential for broader applications beyond ODMR spectroscopy.