Line-narrowing in electron spin echo envelope modulation spectroscopy: a determination of the 15N hyperfine interaction parameters of para-nitrobenzo-15N-nitrile radical anion in frozen solution

Gary J. Gerfen, Brendan F. Bellew, David J. Singel

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9 Scopus citations


A strategy for substantially reducing powder-pattern linewidths in ESEEM spectra of spin 1 2 nuclei is demonstrated in the 4 to 12 GHz ESEEM spectra of the radical anion of para-nitrobenzo-15N-nitrile. Line-broadening associated with axial hyperfine interactions can be eliminated in one branch of the ESEEM powder-pattern by optimal selection of external field strength. This line-narrowing strategy extends the applicability of ESEEM spectroscopy to systems with arbitrarily large dipolar couplings. 15N hyperfine coupling constants of the studied radical are evaluated from the multifrequency ESEEM spectra. The impact of rhombic hyperfine couplings on the spectra is discussed and explicitly considered in the quantitative analysis of the experimental results.

Original languageEnglish (US)
Pages (from-to)490-496
Number of pages7
JournalChemical Physics Letters
Issue number5
StatePublished - May 31 1991
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry


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