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Journal of Chemical Physics / Volume 128 / Issue 11 / ARTICLES / Condensed Phase Dynamics, Structure, and Thermodynamics: Spectroscopy, Reactions, and Relaxation

J. Chem. Phys. 128, 114504 (2008); http://dx.doi.org/10.1063/1.2839436 (7 pages)

Thermodynamics of adiabatic cross polarization

Jae-Seung Lee and A. K. Khitrin

Department of Chemistry, Kent State University, Kent, Ohio 44242-0001, USA

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(Received 24 September 2007; accepted 11 January 2008; published online 19 March 2008)

Using a spin-temperature approach, we describe a scheme of adiabatic cross polarization, based on demagnetization/remagnetization, when the Zeeman order of abundant nuclei in the laboratory frame is first adiabatically converted into the dipolar order, and then, into the Zeeman order of rare nuclei. The scheme, implemented with two low-power frequency-sweeping pulses, is very efficient for static samples and can significantly increase polarization of rare nuclei, compared to the conventional Hartmann–Hahn cross polarization. The experimental examples are presented for a solid, liquid crystal, and small molecules in a liquid-crystalline solvent.

© 2008 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. CONSERVATION OF ENTROPY
  3. KINETIC EQUATIONS FOR SPIN TEMPERATURES
  4. ADIABATIC SOLUTION OF THE KINETIC EQUATIONS
  5. PULSE SEQUENCE AND EXPERIMENTAL EXAMPLES
  6. COMPARISON OF DIFFERENT CP SCHEMES WITH INTERMEDIATE DIPOLAR-ORDERED STATE
  7. CONCLUSION

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KEYWORDS and PACS

Keywords

electron spin polarisation, entropy, kinetic theory, magnetisation, thermodynamics, Zeeman effect

PACS

  • 75.60.Ej

    Magnetization curves, hysteresis, Barkhausen and related effects

  • 71.70.Ej

    Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect

  • 61.30.-v

    Liquid crystals

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2839436

PUBLICATION DATA

ISSN

0021-9606 (print)  
1089-7690 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    S. R. Hartmann and E. L. Hahn, Phys. Rev. 128, 2042 (1962).

    A. Pines, M. G. Gibby, and J. S. Waugh, J. Chem. Phys. 59, 569 (1973)JCPSA6000059000002000569000001.

    A. Pines and T. W. Shattuck, J. Chem. Phys. 61, 1255 (1974)JCPSA6000061000003001255000001.

    A. Pines, J. J. Chang, and R. G. Griffin, J. Chem. Phys. 61, 1021 (1974)JCPSA6000061000003001021000001.

    P. Hodgkinson and A. Pines, J. Chem. Phys. 107, 8742 (1997)JCPSA6000107000021008742000001.

    J.-S. Lee and A. K. Khitrin, J. Chem. Phys. 124, 144508 (2006)JCPSA6000124000014144508000001.


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