A new method is developed to measure the spin-conversion time τcon in low-tunnel-frequency systems. The experiment uses field cycling and consists of three steps: saturation of the tunnel reservoir by Zeeman-tunnel resonance; waiting, away from resonance, during a variable time interval tW; and measurement of the decreased tunnel temperature TT, by use of a saturated Zeeman reservoir. A plot of TT vs tW yields τcon. τcon of CH₃ rotors in copper acetate is measured at 15, 12.5, and 6 K and turns out to be extremely long, at least 20T₁. This discrepancy is discussed and compared with the one found in lithium acetate.
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Vandemaele et al. (1986) studied this question.
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