| Autor: |
Lokeswara Rao, Potnuru, Nghia Tuan, Duong, Sahil, Ahlawat, Sreejith, Raran-Kurussi, Matthias, Ernst, Yusuke, Nishiyama, Vipin, Agarwal |
| Rok vydání: |
2020 |
| Zdroj: |
The Journal of chemical physics. 153(8) |
| ISSN: |
1089-7690 |
| Popis: |
Selective recoupling of protons (SERP) is a method to selectively and quantitatively measure magnetic dipole-dipole interaction between protons and, in turn, the proton-proton distance in solid-state samples at fast magic-angle spinning. We present a bimodal operator-based Floquet approach to describe the numerically optimized SERP recoupling sequence. The description calculates the allowed terms in the first-order effective Hamiltonian, explains the origin of selectivity during recoupling, and shows how different terms are modulated as a function of the radio frequency amplitude and the phase of the sequence. Analytical and numerical simulations have been used to evaluate the effect of higher-order terms and offsets on the polarization transfer efficiency and quantitative distance measurement. The experimentally measured |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
