Free evolution period
in homonuclear systems
DESCRIPTION
A free evolution period is a period in which transverse magnetization  is allowed to freely evolve under the effect of coupling constants and chemical shifts. Thus, pulses are not applied on the selected nuclei.

A particular example of this period should be the variable evolution t1 period of any homonuclear 2D experiments.

REQUIREMENTS
Easy implementation on AVANCE spectrometers.
EXPERIMENTAL DETAILS
There are 32 duration parameters, d0-d31,  to be specified in seconds. They are executed as delays without any further actions by the pulse program commands d0. They can be incremented or decremented using the pulse program commands id0-id31 or dd0-dd31, respectively. The changes are given by the parameters IN0-IN31. The pulse program commands rd0-rd31 reset a respective delay to its original value. The delays may also be changed by means of arithmetic expressions during pulse program execution.
 SYNTAX
The standard way to implement a fixed delay in a pulse program is:
...
d2
...
Any delay found in any part of the pulse sequence can be used to change power levels, set frequencies and other utilities. However, BRUKER proposes a standard nomenclature for general use:
  • d0 : incremented delay (2D)                         [3 usec]
  • d1 : relaxation delay; 1-5 * T1
  • d2 : 1/(2J)
  • d3 : 1/(3J)
  • d4 : 1/(4J)
  • d5 : DE/2
  • d6 : delay for evolution of long range couplings
  • d7 : delay for inversion recovery
  • d8 : NOESY mixing time
  • d9 : TOCSY mixing time
  • d10: incremented delay (3D)
  • d11: delay for disk I/O                             [30 msec]
  • d12: delay for power switching                      [20 usec]
  • d13: short delay                                    [3 usec]
  • d14: delay for evolution after shaped pulse
  • d15:
  • d16: delay for homospoil/gradient recovery
  • d17: delay for DANTE pulse-train
  • d18: delay for evolution of long range couplings
  • d19: delay for binomial water suppression
  • d20: for different applications
  • d21: for different applications
  • d22: 1/(2J(XY))
  • d23: 1/(4J(XY))
  • d24: for different applications
  • d25: 1/(6J(YH))
  • d26: 1/(4J(YH))
  • d27:
  • d28: for different applications
  • d29: for different applications
  • d30: for different applications
  • d31: for different applications
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