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- W2065549475 abstract "Abstract The density matrix approach along with fictitious spin-1/2 or tensor operator formalisms were employed to obtain general expressions for <I x >and thus the signal induced in a coil in the case of physically equivalent non-interacting spin I = 1 and 3/2 nuclei in a single crystal with a three-pulse composite pulse. The corresponding powder averages were then obtained and the dependence of the signal on the i-th pulse flip angle (θ i ) and phase (ϕ i ) studied. A numerical procedure established the optimum π/2 composite pulse for polycrystalline samples as (90) 0 -(70) 45 -(20) 25 , where the quantity in parentheses denotes the flip angle and the subscript the phase. A two-pulse composite pulse of the form (126) 0 -(300) 80 was also inferred, but the three-pulse composite pulse is superior. These composite pulses are shown to have general validity for other spin I values." @default.
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- W2065549475 date "1990-04-01" @default.
- W2065549475 modified "2023-09-25" @default.
- W2065549475 title "Numerical Design of Composite Pulses for Polycrystalline Samples in Pulsed NQR Spectroscopy" @default.
- W2065549475 doi "https://doi.org/10.1515/zna-1990-3-465" @default.
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