Multifrequency electron spin-echo envelope modulation: The determination of nitro group 14N hyperfine and quadrupole interactions of DPPH in frozen solution

Heather L. Flanagan, Gary J. Gerfen, David J. Singel

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Two- and three-pulse electron spin-echo modulations from 14N in the nitro groups of DPPH in toluene at 77 K have been measured at electron spin excitation frequencies of 4.45, 4.94, 5.47, 6.68, and 9.10 GHz. Analysis of the frequencies, amplitudes, and linewidths of the modulation components, together with their variation with excitation frequency, establishes that the 14N hyperfine interactions are approximately isotropic and enables the evaluation of the isotropic coupling. Distinctive spectral trends apparent in multifrequency ESEEM are employed to identify the cancellation of hyperfine and Zeeman interactions; modulation components accordingly assigned as pure quadrupole frequencies afford accurate determination of quadrupole coupling constants. Multifrequency ESEEM is shown to be a vital tool of general applicability in 14N ESEEM spectroscopy.

Original languageEnglish (US)
Pages (from-to)20-24
Number of pages5
JournalJournal of Chemical Physics
Volume88
Issue number1
StatePublished - 1988
Externally publishedYes

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electron spin
echoes
envelopes
quadrupoles
Modulation
modulation
Electrons
Toluene
interactions
Linewidth
pulses
Spectroscopy
cancellation
excitation
toluene
trends
evaluation
spectroscopy

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

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abstract = "Two- and three-pulse electron spin-echo modulations from 14N in the nitro groups of DPPH in toluene at 77 K have been measured at electron spin excitation frequencies of 4.45, 4.94, 5.47, 6.68, and 9.10 GHz. Analysis of the frequencies, amplitudes, and linewidths of the modulation components, together with their variation with excitation frequency, establishes that the 14N hyperfine interactions are approximately isotropic and enables the evaluation of the isotropic coupling. Distinctive spectral trends apparent in multifrequency ESEEM are employed to identify the cancellation of hyperfine and Zeeman interactions; modulation components accordingly assigned as pure quadrupole frequencies afford accurate determination of quadrupole coupling constants. Multifrequency ESEEM is shown to be a vital tool of general applicability in 14N ESEEM spectroscopy.",
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T1 - Multifrequency electron spin-echo envelope modulation

T2 - The determination of nitro group 14N hyperfine and quadrupole interactions of DPPH in frozen solution

AU - Flanagan, Heather L.

AU - Gerfen, Gary J.

AU - Singel, David J.

PY - 1988

Y1 - 1988

N2 - Two- and three-pulse electron spin-echo modulations from 14N in the nitro groups of DPPH in toluene at 77 K have been measured at electron spin excitation frequencies of 4.45, 4.94, 5.47, 6.68, and 9.10 GHz. Analysis of the frequencies, amplitudes, and linewidths of the modulation components, together with their variation with excitation frequency, establishes that the 14N hyperfine interactions are approximately isotropic and enables the evaluation of the isotropic coupling. Distinctive spectral trends apparent in multifrequency ESEEM are employed to identify the cancellation of hyperfine and Zeeman interactions; modulation components accordingly assigned as pure quadrupole frequencies afford accurate determination of quadrupole coupling constants. Multifrequency ESEEM is shown to be a vital tool of general applicability in 14N ESEEM spectroscopy.

AB - Two- and three-pulse electron spin-echo modulations from 14N in the nitro groups of DPPH in toluene at 77 K have been measured at electron spin excitation frequencies of 4.45, 4.94, 5.47, 6.68, and 9.10 GHz. Analysis of the frequencies, amplitudes, and linewidths of the modulation components, together with their variation with excitation frequency, establishes that the 14N hyperfine interactions are approximately isotropic and enables the evaluation of the isotropic coupling. Distinctive spectral trends apparent in multifrequency ESEEM are employed to identify the cancellation of hyperfine and Zeeman interactions; modulation components accordingly assigned as pure quadrupole frequencies afford accurate determination of quadrupole coupling constants. Multifrequency ESEEM is shown to be a vital tool of general applicability in 14N ESEEM spectroscopy.

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