Radiofrequency Perturbation of Selectively Excited Nuclear Hyperfine Levels

  • Neil D. Heiman
  • J. C. Walker
  • Loren Pfeiffer
Conference paper


Many interesting experiments have been performed using optical resonance radiation. Similar types of experiments can, in some instances, be performed with nuclear resonance radiation. In the experiments described here, the Mössbauer effect has been used to selectively excite hyperfine sublevels, in direct analogy to the technique employed in optical pumping. Specifically, each of the four mj sublevels of the 14.4 keV state o/Fe57 have been individually and exclusively populated using a constant-velocity drive system, a single-line Co57 source, and a metallic iron scatterer arranged in 90° scattering geometry. The excited-state nuclear polarization was detected by analyzing the scattered radiation with a second spectrometer.

This procedure has been used to detect NMR transitions between the hyperfine sublevels of the 100-nsec state of Fe57. This result is encouraging, not only because it allows an accurate and velocity-independent determination of the Fe57 hyperfine parameters; but, more importantly, the Mössbauer-NMR technique provides an unusually clear method for studying many fundamental physical problems associated with excited-state NMR. Results thus far obtained provide little evidence to support the predictions of Hack and Hammermesh, or Gabriel regarding the NMR-produced distortion of the gamma-ray lineshape; however, the frequency dependence of the NMR transition probability is generally in accord with theory, although some anomalies result from the application of a static field.

During the investigation of the NMR process, it was discovered that subjecting an iron absorbing foil to an rf magnetic field produced additional distinct lines in the Mössbauer absorption spectrum of Fe57. These additional lines have been interpreted as frequency-modulated side bands caused by magnetostrictively produced vibrations. This sideband effect is the most likely explanation of the anomalous effects observed in earlier attempts to use the Mössbauer effect to observe excited-state NMR.


Nuclear Magnetic Resonance Metallic Iron Excited Nucleus Hyperfine Level Nuclear Magnetic Resonance Frequency 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    A. Kastler, Physics Today 21:34 (1967).CrossRefGoogle Scholar
  2. 2.
    Jean Brossel and Francis Bitter, Phys. Rev. 86:308 (1952).CrossRefGoogle Scholar
  3. 3.
    G. J. Perlow, in Proceedings of the Mössbauer Effect Conference, University of Illinois, 1960, H. Frauenfelder and H. Lustig, eds. [University of Illinois Report No. AFOSR TN 60–698 (unpublished)]: Phys. Rev. 172:319 (1968).Google Scholar
  4. 4.
    E. Matthias, in Hyperfine Interactions and Nuclear Radiations, E. Matthias and D. A. Shirley, eds. (North-Holland Publishing Co., Amsterdam, 1968).Google Scholar
  5. 5.
    N. Heiman, L. Pfeiffer, and J. C. Walker, Phys. Rev. 184:281 (1969).CrossRefGoogle Scholar
  6. 6.
    A. M. Portis and R. H. Lindquist, in Magnetism, G. T. Rado and H. Suhl, eds. (Academic Press, New York 1965), Vol. II-A, p. 357.Google Scholar
  7. 7.
    M. N. Hack and M. Hammermesh, Nuovo Cimento 19:546 (1961).CrossRefGoogle Scholar
  8. 8.
    Helmut Gabriel, Phys. Rev. 184:359 (1969).CrossRefGoogle Scholar
  9. 9.
    N. Heiman, L. Pfeiffer, and J. C. Walker, Phys. Rev. Letters 21:93 (1968);CrossRefGoogle Scholar
  10. 9a.
    N. Heiman, L. Pfeiffer, and J. C. Walker, J. Appl. Phvs. 40:1410(1969).CrossRefGoogle Scholar
  11. 10.
    G. Asti, G. Albanese, and C. Bucci, Phys. Rev. 184:260 (1969);CrossRefGoogle Scholar
  12. 10a.
    G. Asti, G. Albanese, and C. Bucci, Nuovo Cimento 57:531 (1968).CrossRefGoogle Scholar
  13. 11.
    S. L. Ruby and D. I. Bolef, Phys. Rev. Letters 5:5 (1960).CrossRefGoogle Scholar
  14. 12.
    N. F. Ramsey, Molecular Beams (Oxford Press, London, 1963), pp. 153 ff.Google Scholar
  15. 13.
    N. Heiman, L. Pfeiffer, and J. C. Walker, to be published.Google Scholar
  16. 14.
    A. Morrish, Physical Principles of Magnetism (John Wiley and Sons, New York 1965), p. 325.Google Scholar
  17. 15.
    S. Chikazumi, Physics of Magnetism (John Wiley and Sons, New York, 1964). Chapter 8.Google Scholar

Copyright information

© New England Nuclear Corporation 1971

Authors and Affiliations

  • Neil D. Heiman
    • 1
  • J. C. Walker
    • 1
  • Loren Pfeiffer
    • 2
  1. 1.Physics DepartmentThe Johns Hopkins UniversityBaltimoreUSA
  2. 2.Bell Telephone LaboratoriesMurray HillUSA

Personalised recommendations