The T 1 of a certain sample decreases with increasing temperature. At 20 ? C it is necessary to…

The T 1 of a certain sample decreases with increasing temperature. At 20 ? C it is necessary to leave 10 s between transients, whereas at 40 ? C only 5 s is required. Suppose that 3 h of NMR spectrometer time is available and that the instrument is already set up for operation at 20 ? C. It takes 1 h to warm the sample to 40 ?C and to stabilize the temperature. Assume that the NMR signals are identical at the two temperatures. What is the best strategy for acquiring the signals: running for 3 h at 20 ?C, or warming the sample and running for 2 h at 40 ? C?