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Ramped-Amplitude Cross Polarization in Magic-Angle-Spinning NMR
Open accessAbstract
The Hartmann-Hahn matching profile in CP-MAS NMR shows a strong mismatch dependence if the MAS frequency is on the order of the dipolar couplings in the sample. Under these conditions, the profile breaks down into a series of narrow matching bands separated by the spinning speed, and it becomes difficult to establish and maintain an efficient matching condition. Variable-amplitude CP (VACP), as introduced previously (Peersen et al., J. Magn. Reson. A104, 334, 1993), has been proven to be effective for restoring flat profiles at high spinning speeds. Here, a refined implementation of VACP using a ramped-amplitude cross-polarization sequence (RAMP-CP) is described. The order of the amplitude modulation is shown to be of importance for the cross-polarization process. The new pulse sequence with a linear amplitude ramp is not only easier to set up but also improves the performance of the variable-amplitude experiment in that it produces flat profiles over a wider range of matching conditions even with short total contact times. An increase in signal intensity is obtained compared to both con ventional CP and the originally proposed VACP sequence.
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Metadata
- Authors
- Metz, G., Wu, X. L., & Smith, S. O.
- Venue
- Journal of Magnetic Resonance, Series A
- Publisher
- Elsevier BV
- Published
- 1994-10
- Volume
- 110
- Issue
- 2
- Pages
- 219-227
- ISSN
- 1064-1858 (ISSN-L)
- OpenAlex
- W2107746113
- Cited by
- 1,217
- References
- 0
- FWCI
- 6.87
- Type
- journal article
- Language
- en
- Open access
- hybrid
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- CoChat. (2026). Citation check: Ramped-Amplitude Cross Polarization in Magic-Angle-Spinning NMR. https://app.cochat.ai/papers/10.1006/jmra.1994.1208
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- Metz, G., Wu, X. L., & Smith, S. O. (1994). Ramped-Amplitude Cross Polarization in Magic-Angle-Spinning NMR. Journal of Magnetic Resonance, Series A. https://doi.org/10.1006/jmra.1994.1208
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