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:
- 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).
- 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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