Compensated DRAMA sequence for homonuclear dipolar recoupling under magic-angle spinning

Autor:	Jerry C. C. Chan, Hsin-Kuan Lee, Fang-Chieh Chou, Tim W. T. Tsai
Rok vydání:	2009
Předmět:	Nuclear and High Energy Physics Radiation Offset (computer science) business.industry Chemistry Pulse sequence General Chemistry Homonuclear molecule Dipole Optics Magic angle spinning Atomic physics Anisotropy business Instrumentation Excitation
Zdroj:	Solid State Nuclear Magnetic Resonance. 36:177-181
ISSN:	0926-2040
DOI:	10.1016/j.ssnmr.2009.11.002
Popis:	The DRAMA sequence has been considered as the milestone in the development of homonuclear dipolar recoupling. Although it has a high efficiency for double-quantum excitation in spin 1/2 systems, it is seldom used today for real applications because of its susceptibility to the deteriorating effects of chemical shift anisotropy and resonance offsets. We show in this work that the practicability of DRAMA can be greatly enhanced by incorporating four π pulses with XY-4 phases into the basic DRAMA cycles. Average Hamiltonian theory is used to evaluate the performance of the resulting pulse sequence with respect to the compensation of chemical shift anisotropy. Numerical simulations and experimental measurements on hydroxyapatite indeed show that the performance of DRAMA-XY4 is very satisfying for 31 P DQ excitation, provided that the resonance offset is within the range of [−4, 4] kHz.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6ee7fe247f20cb6a5126d54599c7ac9d https://doi.org/10.1016/j.ssnmr.2009.11.002 Zobrazit plný text záznamu Full Text from ScienceDirect