Ultrfast-ARPES, Tr-ARPES/TARPES, or pump-probe ARPES refers to pump probe photoemission experiments conducted with pulses from a laser typically of femtosecond duration. Some pump probe modalities nonetheless exist at synchrotrons, and CW experiments can indirectly access dynamics by measuring quasiparticle diffusion.

Tr-ARPES datasets can in principle have at least two additional degrees of freedom, the excitation delay—referred to through PyARPES as delay—and the pump wavelength.

Analysis tools for Tr-ARPES exist in arpes.analysis.tarpes. Plotting utilities are to be found in arpes.plotting.tarpes.

More details and analysis examples to come in the future.