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Theory of selective excitation of multiple-quantum transitions

Publication ,  Journal Article
Warren, WS; Weitekamp, DP; Pines, A
Published in: The Journal of Chemical Physics
January 1, 1980

The question of whether a molecule can be made to absorb and emit photons only in groups of n is treated. Pulse sequences are introduced which in effect selectively induce the absorption of only groups of n photons. This causes only n-quantum transitions even when many other transitions might be resonant. The technique involves repeated phase shifts of 2π/n in the radiation to build up the selected coherences and cancel all other coherences, and is applicable to a wide range of spectroscopic systems. Coherent averaging theory is extended to describe selective sequences and demonstrates that n-quantum selectivity is possible to arbitrarily high order in the average Hamiltonian expansion. High-order selectivity requires many phase shifts, however, and for this reason the residual nonselective effects of sequences which are selective to only a finite order are calculated. Selective sequences are applied to the multiple-quantum NMR of oriented molecules, where in combination with time reversal sequences they produce a much more efficient transfer of the population differences into selected coherences than is obtainable by normal wideband pumping. For example, the 10-quantum transition in a 10-spin system can be enhanced by more than four orders of magnitude. Experiments on selective excitation of the 4-quantum transitions in oriented benzene verify the expected enhancement. © 1980 American Institute of Physics.

Duke Scholars

Published In

The Journal of Chemical Physics

DOI

ISSN

0021-9606

Publication Date

January 1, 1980

Volume

73

Issue

5

Start / End Page

2084 / 2099

Related Subject Headings

  • Chemical Physics
  • 51 Physical sciences
  • 40 Engineering
  • 34 Chemical sciences
  • 09 Engineering
  • 03 Chemical Sciences
  • 02 Physical Sciences
 

Citation

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Warren, W. S., Weitekamp, D. P., & Pines, A. (1980). Theory of selective excitation of multiple-quantum transitions. The Journal of Chemical Physics, 73(5), 2084–2099. https://doi.org/10.1063/1.440403
Warren, W. S., D. P. Weitekamp, and A. Pines. “Theory of selective excitation of multiple-quantum transitions.” The Journal of Chemical Physics 73, no. 5 (January 1, 1980): 2084–99. https://doi.org/10.1063/1.440403.
Warren WS, Weitekamp DP, Pines A. Theory of selective excitation of multiple-quantum transitions. The Journal of Chemical Physics. 1980 Jan 1;73(5):2084–99.
Warren, W. S., et al. “Theory of selective excitation of multiple-quantum transitions.” The Journal of Chemical Physics, vol. 73, no. 5, Jan. 1980, pp. 2084–99. Scopus, doi:10.1063/1.440403.
Warren WS, Weitekamp DP, Pines A. Theory of selective excitation of multiple-quantum transitions. The Journal of Chemical Physics. 1980 Jan 1;73(5):2084–2099.

Published In

The Journal of Chemical Physics

DOI

ISSN

0021-9606

Publication Date

January 1, 1980

Volume

73

Issue

5

Start / End Page

2084 / 2099

Related Subject Headings

  • Chemical Physics
  • 51 Physical sciences
  • 40 Engineering
  • 34 Chemical sciences
  • 09 Engineering
  • 03 Chemical Sciences
  • 02 Physical Sciences