I am trying to calibrate 137Ba pulses on solid state probes with a
saturating BaCl2/H2O solution. I was expecting to see the signal in a few
scans because 137Ba has similar absolute receptivity to 13C. But I have
searched in a range of +/- 50KHz with hundreds of scans and have not found
the signal (I have tried on a wideline probe, by Varian, and a CP/MAS probe,
by Doty, both run statically and tuned well, on a 300MHz Unity Plus). I
assume that I can use short relaxation delay and have used d1 between 0.5
sec and 2 sec. To avoid acoustic ring down, I used a delay of 150us before
acquisition (rof2, in vnmr). I would appreciate any advice how to calibrate
the 90 degree pulse.
Hsin
--
Hsin Wang, Ph.D.
NMR Facility Manager
College of Staten Island
2800 Victory Boulevard
Staten Island, NY 10314
Phone: 718-982-3809
Fax: 718-982-3910
Email: wang_at_mail.csi.cuny.edu
Received on Fri Nov 05 2004 - 14:51:22 MST