Dynamic nuclear polarization with a cyclotron resonance maser at 5 T

Lino R. Becerra, Gary J. Gerfen, Richard J. Temkin, David J. Singel, Robert G. Griffin

Research output: Contribution to journalArticle

333 Citations (Scopus)

Abstract

DNP (dynamic nuclear polarization) experiments at 5 T are reported, in which a cycoltron resonance maser (gyrotron) is utilized as a 20 W, 140 GHz microwave source to perform the polarization. MAS (magic angle spinning) NMR spectroscopy with DNP has been performed on samples of polystyrene doped with the free radical BDPA (,-bisdiphenylene - phenylallyl) at room temperature. Maximal DNP enhancements of 10 for H1 and 40 for C13 are observed and are considerably larger than expected. The DNP and spin relaxation mechanisms that lead to these enhancements at 5 T are discussed.

Original languageEnglish (US)
Pages (from-to)3561-3564
Number of pages4
JournalPhysical Review Letters
Volume71
Issue number21
DOIs
StatePublished - 1993
Externally publishedYes

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masers
cyclotron resonance
polarization
augmentation
free radicals
metal spinning
polystyrene
microwaves
nuclear magnetic resonance
room temperature
spectroscopy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Dynamic nuclear polarization with a cyclotron resonance maser at 5 T. / Becerra, Lino R.; Gerfen, Gary J.; Temkin, Richard J.; Singel, David J.; Griffin, Robert G.

In: Physical Review Letters, Vol. 71, No. 21, 1993, p. 3561-3564.

Research output: Contribution to journalArticle

Becerra, Lino R. ; Gerfen, Gary J. ; Temkin, Richard J. ; Singel, David J. ; Griffin, Robert G. / Dynamic nuclear polarization with a cyclotron resonance maser at 5 T. In: Physical Review Letters. 1993 ; Vol. 71, No. 21. pp. 3561-3564.
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