去偶道中氢的90度脉宽的测定（pp）

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Determining the ¹H 90° pulse width of the decoupler

1. It is strongly recommended that you use the 90% CHCL₃ in d₆-acetone sample for this calibration, since this sample has strong carbon signals that may be detected with a small number of transients (nt).
2. Click on main menu, setup, 13C Acetone to select carbon standard parameters.
3. Type ppcal to set up the pp calibration experiment.
4. Adjust the following parameters: pp=0
   pplvl=49 WARNING!!! Do NOT set pplvl larger than 49!
   d1=3.0
   d2=0.003185 for the acetone standard. Set to 1/(2*J_CH)
   pw=¹³C 90° pulse width
   p1=¹³C 180° pulse width
   dm='yny'
   dmm='wcw'
   dof =-426.0
   nt=4 for the acetone standard
   gain='n'
5. Type ga and phase the spectrum.
6. Type gain='y'
7. Set pp to your estimate of the decoupler 90° pulse width
8. Type ga
9. Repeat steps 6 and 7 until the intensity of the chloroform peak is minimum (zero intensity is ideal).

tt777_1028

不懂！

sunny

不懂，做什么用的啊！

rank

array pp 就是了，干吗搞那么复杂。

sunny

这个计算出来有什么用啊？请告诉一下，谢谢！～