Carbon-13 Magnetic Shielding from Beam-Maser Measurements of Spin-Rotation Interaction in Acetonitrile

S. G. Kukolich, G. Lind, M. Barfield, L. Faehl, J. L. Marshall

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19 Scopus citations


The J=I → 0 transitions in CH313CN were observed using a beam maser spectrometer at 6-kHz line width (fwhm) and a 13C-enriched sample. The strongest component was observed with natural-abundance CH313CN. Spectra of CH312CN were obtained at higher resolution using Ramsey—s method of separated oscillating fields. For CH312CN we obtain eqQN = -4224.4 ± 0.7 kHz, CN=2.0 ± 0.4 kHz, CH=-0.6 ± 0.4 kHz, and a J=1 → 0 transition center frequency of 18 397 783.5 ± 0.7 kHz. For CH3,13CN the J=1 → 0 transition center frequency is 18 388 681.0 ± 2.0 kHz and we obtain eqQN=-4224.6 ± 1kHz and CN=1.9 ± 0.5 kHz. The 13C spin-rotation strength in CH313CN was determined in this study to be 3.6 ± 0.2 kHz and this leads to a value of σ⊥=- 11 ± 14 ppm.

Original languageEnglish (US)
Pages (from-to)7155-7159
Number of pages5
JournalJournal of the American Chemical Society
Issue number23
StatePublished - Jan 1 1978


ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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