Photo-CIDNP MAS NMR beyond the T(1) limit by fast cycles of polarization extinction and polarization generation.

Photo-CIDNP MAS NMR beyond the T(1) limit by fast cycles of polarization extinction and polarization generation. Research Abstract Details 

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Photo-CIDNP MAS NMR beyond the T(1) limit by fast cycles of polarization extinction and polarization generation. Abstract Text:

Eugenio Daviso,Anna Diller,A Alia, Matysik,Gunnar Jeschke,

In nanosecond-laser flash photo-CIDNP MAS NMR, polarization generation (PG) proceeds much faster than longitudinal spin relaxation. With a nanosecond-laser setup linked to the NMR console the repetition time of the experiment is then limited by the minimum recycle delay of the NMR spectrometer and the maximum repetition rate of laser flashes. These limits can only be reached if polarization left after the NMR experiment is completely canceled before the next laser flash. We introduce a presaturation pulse sequence, based on three (pi/2) (13)C pulses and optimized timing and phase cycling that allows for such efficient polarization extinction (PE). The technique is demonstrated on selectively isotope labeled bacterial reaction centers (RCs) of Rhodobacter (Rb.) sphaeroides wildtype (WT). High-quality (13)C photo-CIDNP MAS NMR spectra are obtained using cycle rates up to 4Hz. The PE-PG strategy proposed here provides a general experimental scheme for reduction of measurement time in magnetic resonance experiments based on fast PG.

Photo-CIDNP MAS NMR beyond the T(1) limit by fast cycles of polarization extinction and polarization generation. Publishing Authors By Initials

E Daviso,A Diller,A Alia,J Matysik,G Jeschke,

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Photo-CIDNP MAS NMR beyond the T(1) limit by fast cycles of polarization extinction and polarization generation. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Journal of magnetic resonance (San Diego, Calif. :

VOLUME: 190

Page Numbers: 43-51

Journal Abbreviation: J. Magn. Reson.

ISSN: 1090-7807

DAY: 9

MONTH: 10

YEAR: 2007

Photo-CIDNP MAS NMR beyond the T(1) limit by fast cycles of polarization extinction and polarization generation. Information

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LANGUAGE: eng

NlmUniqueID: 9707935

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Grant and Affiliation Information for Photo-CIDNP MAS NMR beyond the T(1) limit by fast cycles of polarization extinction and polarization generation.

AFFILIATION: Leiden Institute of Chemistry, Einsteinweg 55, P.O. Box 9502, 2300 RA Leiden, The Netherlands.

Country: United States

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MEDLINETA: J Magn Reson

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