Spin Systems with Variable Arguments

It is also possible to study the effect of pulse sequences using the variable definition feature. Using variable definitions it is possible to increment the chemical shift to 

A chemical shift may be defined as a variable by replacing the constant value in the nucleus or interaction statement by the argument yaridentifier where the variable identifier is a number between 1 and 32. An operator ihv included in the pulse program, outside of the acquisition loop used for multiple scan operation, changes the value of the variable parameter. The modifications required in a pulse program to implement the use of variable parameters are shown in Fig. 4.4. 

The initial value and increment parameters are set in the Go I Check Experiment Parameters dialog box. 

Variable operators These operators have to be placed in the pulse sequence outside of the acquisition loop. 

The operators and arguments loto and tdl times corresponds to the expressions used in the pulse sequence language described in section 4.1.2.3. Table 4.2 summarizes the parameter definition, initialisation and variable parameter operators. 

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