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The PulseSPEL Programming Language TRANS Use the SpecJet in transient recorder mode. INTG Use the SpecJet in integrator mode. Commands and Operations D.1.3 Delays Delays are variables that define the time between events. Events are defined as microwave pulses, and trigger pulses for acquisition or external devices. The variable values (delay lengths) can be defined in the variable definitions file, in the program, through algebraic operations, and via editing in the Acquisition panel of the FT-EPR Parameters window. There are 26 delay variables, D0 ... D31. Pulses Pulses are variables that determine the length and source of a PatternJet pulse. The variable values (pulse lengths) can be defined in the variable definitions file, in the program, through algebraic operations, and via editing in the Acquisition panel of the FT-EPR Parameters window. There are 32 delay variables, P0 ... P31. The variables are followed by a set of square brackets with a definition of the PatternJet channel. p1 [+x] p0 [ph1] p8 [U1] The definition may be a microwave pulse channel, a phase program from the lists section, or a spare PatternJet channel that can be used to trigger an external device such as a laser. If you have an optional pulse ENDOR accessory, the definition between the square brackets is slightly different. The first entry is either "RF 1" or "RF 2" and is required to select the desired channel of the ENDOR unit. You may also specify a frequency variable or a phase program (but not both) after the channel designation. The following are valid RF pulse definitions: D-8
