Calculation of coherence pathway selection and cogwheel cycles

Alexej Jerschow, Rajeev Kumar

Research output: Contribution to journalArticlepeer-review


The selection of proper coherence pathways is a very important aspect of the design of NMR pulse sequences. This article describes a C++ program for the calculation of coherence pathway selection via phase cycles, including a module to calculate cogwheel cycles. Cogwheel phase cycles shorter than the original ones [M.H. Levitt et al., J. Magn. Reson. 155 (2002) 300] are derived and experimentally tested for the MQMAS experiment for 3/2 spins. Some other cogwheel cycles are derived for the MQNQMAS, the STMAS experiment, and a PFG diffusion pulse sequence. This program is publicly available through our website with additional documentation and examples.

Original languageEnglish (US)
Pages (from-to)59-64
Number of pages6
JournalJournal of Magnetic Resonance
Issue number1
StatePublished - Jan 2003


  • Cogwheel phase cycles
  • Coherence pathways
  • Diffusion measurements
  • Pulsed field gradients
  • Quadrupolar nuclei

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Nuclear and High Energy Physics
  • Condensed Matter Physics


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