Excitation of multiple quantum transitions under magic angle spinning conditions: Adamantane

Journal Article · Sat Nov 01 04:00:00 EST 1986 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.451726· OSTI ID:5265919

Meier, B H; Earl, W L

A pulse sequence designed for the excitation of multiple quantum transitions in magic angle spinning solid state NMR spectroscopy is presented. It is shown that under the action of the standard time-reversal pulse sequence, the change in the sign of the dipole coupling (which is used to generate the multiple quantum coherences) upon rotation causes the multiple quantum intensity to vanish after each rotor period. This effect is demonstrated both in calculations and in experimental /sup 1/H spectra of adamantane. A modification of the time-reversal pulse sequence, which involves switching the phase of the rf pulses every half-rotor period causes the spin part of the Hamiltonian to switch sign in synchrony with the modulation of the spacial part. This allows the creation of multiple quantum coherences in solids with magic angle spinning. The effectiveness of this pulse sequence is demonstrated through calculations and experiments.

• Research Organization: Los Alamos National Laboratory, Group INC-4, Los Alamos, New Mexico 87545
• OSTI ID: 5265919
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 85:9; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ADAMANTANE
ALKANES
ANGULAR MOMENTUM
CYCLOALKANES
HYDROCARBONS
MULTI-PHOTON PROCESSES
NMR SPECTRA
ORGANIC COMPOUNDS
PARTICLE PROPERTIES
PULSE TECHNIQUES
RESOLUTION
SAMPLE PREPARATION
SOLIDS
SPECTRA
SPIN