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Topics - srbh.sxna

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Spinach bug reports / Offset problem for shaped pulse
« on: October 15, 2012, 12:59:04 PM »
Hi..
I am using the Spinach (Version 1.1.1054) and I found that the function "shaped_pulse" does not enforces the offset given by the user. I tried this with varying offsets and pulses ..and surprisingly it assumes the offset to be at 0 every time.

For very simple spin system (60 spins "13C" distributed from 35ppm to 180 ppm )..to observe the effect at any desired offset(say 35 ppm) I had to shift the shift the chemical shift (0-chemical shift=-35ppm))..and then this works perfectly. But this can't be done in practice!!

could it be the bug or i am making any mistake?
thanks..

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Simulations / Liquid state NMR
« on: October 15, 2012, 12:12:36 PM »
Dear Sir,
I am new to this community but I have been using Spinach library since last six months. I am trying out some liquid state pulse sequences, in particular HSQC; and my spin system has CA-CO coupling. Problem is that I can't get rid of the CO coupling from the indirect dimension. I have tried using shaped off resonance pulse in middle of the F1 evolution(to invert CO only), but this seems to affect the "on resonance" CA peak (severe phase distortion). I think I am missing something...

I suspect the evolution "during" the pulse. I tried to compensate it by applying another pulse at the end of the period ..but it didn't help.

am I missing something?...Could you please guide me on this :)

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