SequencePulseAcquire[din,ham]

performs a pulsaquire experiment of the spin system din given the hamiltonian ham with a 90 Degree pulse.

SequencePulseAcquire[din,ham,b₁]

performs a pulsaquire experiment of the spin system din given the hamiltonian ham with a 90 Degree pulse and b1. The output is a new spinsystem dout.