T₂ Measurements in NMR Using a Small-Angle Repetitive Pulse

Authors: León, V.¹; Valdivieso, E.²; Espidel, J.³

Source: Applied Spectroscopy, Volume 41, Issue 1, Pages 1-165 (January 1987) , pp. 159-160(2)

Publisher: Society for Applied Spectroscopy

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Abstract:

Spin-spin lattice relaxation times T₂ 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. T₂ measurement by the CPMG method has become very popular, but its performance is sensitive to the ratio T₂/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 T₂ was proposed for the case of proton NMR, which one performs by applying a continuous saturating field B₂ to the observed nuclei with different offsets, waiting 5T₁ 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 T₂ values are obtained.

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

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: 1987-01-01

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