title: Five quantum coherence of I=5/2 nuclei: 27Al in polycrystalline AlCl3.
abstract: Optimal conditions were calculated for the excitation and detection of the five quantum coherence of quadrupolar nuclei with I = 5/2 in powder samples, observed by the two-pulse sequence (theta1)x - tau1 - (theta2)alpha - tau2, where alpha is the phase cycling angle. We varied the pulse lengths and the relative values of the nutation frequency omega1 = gammaB1 and the quadrupolar frequency omegaQ. Also, the effect of the resonance offset was studied under optimal conditions. Besides, the conditions for obtaining the maximal echo amplitude after the two-pulse sequence with alpha = y were found. Theoretical results were compared with experiments on 27Al nuclei in polycrystalline AlCl3.
authors.affiliation: Wihuri Physical Laboratory, Department of Physics, University of Turku, Finland.
authors.forename: A
authors.initials: A
authors.lastname: Kaikkonen
authors.forename: E E
authors.initials: EE
authors.lastname: Ylinen
authors.forename: M
authors.initials: M
authors.lastname: Punkkinen
mesh_terms: D000077410:Aluminum Chloride; D017607:Aluminum Compounds / Q000737:chemistry*; D002712:Chlorides / Q000737:chemistry*; D003460:Crystallization; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008432:Mathematical Computing; D011789:Quantum Theory
chemical_list: D017607:Aluminum Compounds; D002712:Chlorides; D000077410:Aluminum Chloride