Discussion
Why is the second dimension in a two dimensional experiment built up indirectly?
Answer: D
The indirect dimension is created by running the pulse sequence many times with the evolution period lengthened by a fixed step each time, then transforming along that series. Each increment costs a full experiment, which is why a two dimensional data set takes minutes to hours where a one dimensional one takes seconds. There is only one receiver and one coil in the usual arrangement, and the field is held rigidly constant by the lock. Understanding the increment explains why the resolution in the indirect dimension is always the poorer of the two.
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