Friday, December 7, 2007

Shaped Pulses for Selective Excitation

Short rectangular pulses have broad excitation profiles (see BLOG entry for November 20, 2007) and are used for non-selective uniform excitation. These are often called "hard" pulses. Longer low power shaped pulses are used to excite specific spectral regions for selective excitation. An example of this is shown below.These are often called "soft" pulses.

4 comments:

Anonymous said...

how do you invert only a peak in your spectrum with a selective pulse while leaving the other peaks unperturbed?

Glenn Facey said...

Anonymous,

See this post of January 20, 2011

http://u-of-o-nmr-facility.blogspot.ca/2011/01/excitation-profiles-for-shaped-pulses.html

which describes the excitation profiles of shaped pulses.

Glenn

Glenn Facey said...

Dear Phani Kumar,

I don't know what you mean by "selective relaxation".

Glenn

Glenn Facey said...

Phani,

I don't know the answers to your questions.

Glenn