Advertisement

Applied Magnetic Resonance

, Volume 34, Issue 3–4, pp 347–353 | Cite as

Dynamic Nuclear Polarization with Simultaneous Excitation of Electronic and Nuclear Transitions

  • G. W. Morley
  • K. Porfyrakis
  • A. Ardavan
  • J. van Tol
Article

Abstract.

Dynamic nuclear polarization transfers spin polarization from electrons to nuclei. We have achieved this by a new method, simultaneously exciting transitions of electronic and nuclear spins. The efficiency of this technique improves with increasing magnetic field. Experimental results are shown for N@C60 with continuous-wave microwaves, which can be expected to produce even higher polarization than the corresponding pulsed techniques for electron spins greater than 1/2. The degree of nuclear polarization in this case can be easily monitored through the intensities of the well-resolved hyperfine components in the electron paramagnetic resonance spectrum. The nuclear spin–lattice relaxation time is orders of magnitude longer than that of the electrons.

Keywords

Electron Paramagnetic Resonance Pentacene Dynamic Nuclear Polarization Nuclear Polarization Electron Paramagnetic Resonance Pulse 
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.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Ardenkjaer-Larsen, J.H., Fridlund, B., Gram, A., Hansson, G., Hansson, L., Lerche, M.H., Servin, R., Thaning, M., Golman, K.: Proc. Natl. Acad. Sci. USA 100, 10158 (2003)CrossRefADSGoogle Scholar
  2. Weis, V., Griffin, R.G.: Solid State Nucl. Magn. Reson. 29, 66 (2006)CrossRefGoogle Scholar
  3. McCarney, E.R., Armstrong, B.D., Lingwood, M.D., Han, S.: Proc. Natl. Acad. Sci. USA 104, 1754 (2007)CrossRefADSGoogle Scholar
  4. van den Brandt, B., Glättli, H., Grillo, I., Hautle, P., Jouve, H., Kohlbrecher, J., Konter, J.A., Leymarie, E., Mango, S., May, R.P., Stuhrmann, H.B., Zimmer, O.: Physica B 335, 193 (2003)CrossRefADSGoogle Scholar
  5. Meyer, W.: Nucl. Instrum. Methods Phys. Res. A 526, 12 (2004)CrossRefADSGoogle Scholar
  6. Morley, G.W., van Tol, J., Ardavan, A., Porfyrakis, K., Zhang, J., Briggs, G.A.D.: Phys. Rev. Lett. 98, 220501 (2007)CrossRefADSGoogle Scholar
  7. Overhauser, A.W.: Phys. Rev. 92, 411 (1953)zbMATHCrossRefADSGoogle Scholar
  8. Henstra, A., Lin, T.-S., Schmidt, J., Wenckebach, W.T.: Chem. Phys. Lett. 165, 6 (1990)CrossRefADSGoogle Scholar
  9. Henstra, A., Dirksen, P., Schmidt, J., Wenckebach, W.T.: J. Magn. Reson. 77, 389 (1988)Google Scholar
  10. Macho, V., Stehlik, D., Vieth, H.-M.: Chem. Phys. Lett. 180, 398 (1991)CrossRefADSGoogle Scholar
  11. Epel, B., Pöppl, A., Manikandan, P., Vega, S., Goldfarb, D.: J. Magn. Reson. 148, 388 (2001)CrossRefADSGoogle Scholar
  12. Feher, G., Gere, E.A.: Phys. Rev. 103, 501 (1956)CrossRefADSGoogle Scholar
  13. Harbridge, J.R., Rinard, G.A., Quine, R.W., Eaton, S.S., Eaton, G.R.: J. Magn. Reson. 156, 41 (2002)CrossRefADSGoogle Scholar
  14. Murphy, T.A., Pawlik, T., Weidinger, A., Höhne, M., Alcala, R., Spaeth, J.-M.: Phys. Rev. Lett. 77, 1075 (1996)CrossRefADSGoogle Scholar
  15. Lips, K., Waiblinger, M., Pietzak, B., Weidinger, A.: Phys. Status Solidi A 177, 81 (2000)CrossRefADSGoogle Scholar
  16. Kanai, M., Porfyrakis, K., Briggs, G.A.D., Dennis, T.J.S.: Chem. Commun. 2004, 210 (2004)CrossRefGoogle Scholar
  17. van Tol, J., Brunel, L.-C., Wylde, R.J.: Rev. Sci. Instrum. 76, 074101 (2005)CrossRefADSGoogle Scholar
  18. Morley, G.W., Brunel, L.-C., van Tol, J.: Rev. Sci. Instrum. 79, 064703 (2008)CrossRefADSGoogle Scholar
  19. Morley, G.W.: D.Phil. thesis, University of Oxford, Oxford, UK, 2005Google Scholar
  20. Harneit, W.: Phys. Rev. A 65, 032322 (2002)CrossRefADSGoogle Scholar
  21. Ardavan, A., et al.: Philos. Trans. R. Soc. London A 361, 1473 (2003)CrossRefADSGoogle Scholar
  22. Morton, J.J.L., Tyryshkin, A.M., Ardavan, A., Porfyrakis, K., Lyon, S.A., Briggs, G.A.D.: Phys. Rev. Lett. 95, 200501 (2005)CrossRefADSGoogle Scholar

Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • G. W. Morley
    • 1
    • 2
  • K. Porfyrakis
    • 3
  • A. Ardavan
    • 4
  • J. van Tol
    • 5
  1. 1.London Centre for NanotechnologyLondonUK
  2. 2.Department of Physics and AstronomyUniversity College LondonLondonUK
  3. 3.Department of MaterialsUniversity of OxfordOxfordUK
  4. 4.Clarendon LaboratoryUniversity of OxfordOxfordUK
  5. 5.National High Magnetic Field LaboratoryFlorida State UniversityTallahasseeUSA

Personalised recommendations