RAFFn relaxation rate functions

Dennis J. Sorce, Shalom Michaeli

Research output: Contribution to journalArticlepeer-review


In the present study we derive expressions for relaxation rate functions due to dipolar interactions between identical spins in the rotating frames of rank greater than or equal to 3. The rotating frames are produced due to fictitious magnetic field as generated by amplitude and frequency modulated radiofrequency (RF) pulses operating in non-adiabatic regime. This solution provides a means for description of the relaxations during method entitled Relaxation Along a Fictitious Field (RAFF) in the rotating frame of rank n (RAFFn), in which a fictitious field is created in a coordinate frame undergoing multi-fold rotation about n axes (i.e., rank n). We validate the proposed model by comparison with the accepted trigonometric relations for relaxation rates between tilted frames. The agreement between the proposed model for RAFF3 and the trigonometric model is excellent.

Original languageEnglish (US)
Pages (from-to)28-33
Number of pages6
JournalJournal of Magnetic Resonance
StatePublished - Aug 2018

Bibliographical note

Funding Information:
One of the authors (DJS) thanks Sanford Simon for discussion and support over the years. This work was supported by the NIH core grant P41-EB015894 .

Publisher Copyright:
© 2018


  • Dipolar
  • Higher frames
  • RAFFn
  • Relaxation
  • Tilted frame


Dive into the research topics of 'RAFFn relaxation rate functions'. Together they form a unique fingerprint.

Cite this