T 2 Measurements in NMR Using a Small-Angle Repetitive Pulse

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Spin-spin lattice relaxation times T 2 have been measured since 1950 with the use of the spin echo method. Since then, several modifications have been introduced in order to overcome technical difficulties. T 2 measurement by the CPMG method has become very popular, but its performance is sensitive to the ratio T 2/τ, where τ is the time between pulses. The spin locking technique gives good results but is not normally available in conventional spectrometers. Recently, a new way of measuring T 2 was proposed for the case of proton NMR, which one performs by applying a continuous saturating field B 2 to the observed nuclei with different offsets, waiting 5T 1 between pulses until the spin system has reached equilibrium. The resulting M z values are matched to the stationary solution of the Bloch equation. Consequently, the T 2 values are obtained.

Keywords: NMR; New pulse sequence; Small-angle pulses; T2 measurements

Document Type: Short Communication

DOI: http://dx.doi.org/10.1366/0003702874867882

Affiliations: 1: Centro de Física, IVIC, Apdo. 1827, Caracas 1010-A, Venezuela 2: Centro de Física, IVIC, Apdo. 1827, Caracas 1010-A, Venezuela; on leave of absence from: Facultad de Ingeniería, Universidad de Carabobo, Valencia, Venezuela 3: Centro de Física, IVIC, Apdo. 1827, Caracas 1010-A, Venezuela; present address: Chemistry Department, Science Laboratories, University of Durham, Durham DH1 3LE, U.K.

Publication date: January 1, 1987

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