Bibliographic Details
| Title: |
Low-power cross polarization in fast magic-angle spinning NMR experiments |
| Authors: |
Lange, Adam1, Scholz, Ingo1, Manolikas, Theofanis1, Ernst, Matthias1, Meier, Beat H. beat.meier@gmx.ch |
| Source: |
Chemical Physics Letters. Jan2009, Vol. 468 Issue 1-3, p100-105. 6p. |
| Subjects: |
Polarization (Electricity), Nuclear magnetic resonance, Nuclear cross sections, Magnetic coupling, Protein spectra |
| Abstract: |
Abstract: We describe a low-power approach for heteronuclear cross-polarization (CP) at high magic-angle spinning (MAS) frequencies. It is based on second-order CP at the n =0 Hartmann–Hahn condition. The mechanism for the polarization transfer in the low-power CP experiment relies on second-order cross terms between homonuclear and heteronuclear dipolar couplings. At a MAS frequency of 65kHz, rf-field amplitudes below 10kHz are sufficient to efficiently transfer polarization from 1H to 13C. The low-rf field requirements of this approach make it well suited for the investigation of proteins and other temperature-sensitive samples without the risk of sample heating and degradation. [Copyright &y& Elsevier] |
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| Database: |
Engineering Source |
