Abstract
The measurement of very short spin-lattice, or longitudinal, relaxation (SLR) times (i.e., 10−10 < T 1 < 10−6 s) is of great importance today for the study of relaxation processes. Recent case studies include, for example, glasses doped with paramagnetic ions (Vergnoux et al., 1996; Zinsou et al., 1996), amorphous Si (dangling bonds) and copper-chromium-tin spinel (Cr3+) (Misra, 1998), and polymer resins doped with rare-earth ions (Pescia et al., 1999a; Pescia et al. 1999b). The ability to measure such fast SLR data on amorphous Si and copper-chromium-tin spinel led to an understanding of the role of exchange interaction in affecting spin-lattice relaxation, while the data on polymer resins doped with rare-earth ions provided evidence of spin-fracton relaxation (Pescia et al., 1999a, b). But such fast SLR times are not measurable by the most commonly used techniques of saturation- and inversion-recovery (Poole, 1982; Alger, 1968), which only measure spin-lattice relaxation times longer than 10−6 s. A summary of relevant experimental data is presented in Table 1.
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Misra, S.K. (2006). Microwave Amplitude Modulation Technique to Measure Spin-Lattice (T 1) and Spin-Spin (T 2) Relaxation Times. In: Computational and Instrumental Methods in EPR. Biological Magnetic Resonance, vol 25. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-38880-9_1
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