[Question from NMRWiki Q&A forum] Measurement of very short T2

[nmrlearner]

Measurement of very short T2

Hello,

I'm measuring T2 in paramagnetic materials. These values are very short (0.5-5 ms), and I have to use very short interpulse delays. On Bruker machines standard CPMG sequence looks like this:

d1 p1(90°) [d20 p2(180°) d20]

the number of 180° trains [number of times the sequence in square brackets is repeated] is specified in vc list. I use 12 points, from 8 to 96 pulse trains.

Suppose my d20 is 40 us and my p2 is 20 us.

My questions are:

1. Should the duration of p2 be included in the calculation of TE? If yes, then in my example, the TE would be 0.1 ms, not 0.08 ms (per loop).
   
2. Should I be worried about applying high-power pulses so frequently? In this example, the pulse is applied 20% of the time. What if d20 is 0? This would result in a continuous pulse of up to 96*0.02=1.92 msec. Can this fry the probe? My d1 is at least 100 ms.
   

Thanks!



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