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.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
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)
Weis, V., Griffin, R.G.: Solid State Nucl. Magn. Reson. 29, 66 (2006)
McCarney, E.R., Armstrong, B.D., Lingwood, M.D., Han, S.: Proc. Natl. Acad. Sci. USA 104, 1754 (2007)
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)
Meyer, W.: Nucl. Instrum. Methods Phys. Res. A 526, 12 (2004)
Morley, G.W., van Tol, J., Ardavan, A., Porfyrakis, K., Zhang, J., Briggs, G.A.D.: Phys. Rev. Lett. 98, 220501 (2007)
Overhauser, A.W.: Phys. Rev. 92, 411 (1953)
Henstra, A., Lin, T.-S., Schmidt, J., Wenckebach, W.T.: Chem. Phys. Lett. 165, 6 (1990)
Henstra, A., Dirksen, P., Schmidt, J., Wenckebach, W.T.: J. Magn. Reson. 77, 389 (1988)
Macho, V., Stehlik, D., Vieth, H.-M.: Chem. Phys. Lett. 180, 398 (1991)
Epel, B., Pöppl, A., Manikandan, P., Vega, S., Goldfarb, D.: J. Magn. Reson. 148, 388 (2001)
Feher, G., Gere, E.A.: Phys. Rev. 103, 501 (1956)
Harbridge, J.R., Rinard, G.A., Quine, R.W., Eaton, S.S., Eaton, G.R.: J. Magn. Reson. 156, 41 (2002)
Murphy, T.A., Pawlik, T., Weidinger, A., Höhne, M., Alcala, R., Spaeth, J.-M.: Phys. Rev. Lett. 77, 1075 (1996)
Lips, K., Waiblinger, M., Pietzak, B., Weidinger, A.: Phys. Status Solidi A 177, 81 (2000)
Kanai, M., Porfyrakis, K., Briggs, G.A.D., Dennis, T.J.S.: Chem. Commun. 2004, 210 (2004)
van Tol, J., Brunel, L.-C., Wylde, R.J.: Rev. Sci. Instrum. 76, 074101 (2005)
Morley, G.W., Brunel, L.-C., van Tol, J.: Rev. Sci. Instrum. 79, 064703 (2008)
Morley, G.W.: D.Phil. thesis, University of Oxford, Oxford, UK, 2005
Harneit, W.: Phys. Rev. A 65, 032322 (2002)
Ardavan, A., et al.: Philos. Trans. R. Soc. London A 361, 1473 (2003)
Morton, J.J.L., Tyryshkin, A.M., Ardavan, A., Porfyrakis, K., Lyon, S.A., Briggs, G.A.D.: Phys. Rev. Lett. 95, 200501 (2005)
Author information
Authors and Affiliations
Additional information
Authors' address: Gavin W. Morley, London Centre for Nanotechnology, 17-19 Gordon Street, London WC1H 0AH, United Kingdom
Rights and permissions
About this article
Cite this article
Morley, G., Porfyrakis, K., Ardavan, A. et al. Dynamic Nuclear Polarization with Simultaneous Excitation of Electronic and Nuclear Transitions. Appl Magn Reson 34, 347–353 (2008). https://doi.org/10.1007/s00723-008-0112-x
Received:
Issue Date:
DOI: https://doi.org/10.1007/s00723-008-0112-x