Transient absorption spectroscopy using three pulses (a strong
pump, a
dump pulse that can alter the course of the reaction photoinduced by the first pulse, and a weak
probe). In general, femtosecond laser pulses are used.
Source:
PAC, 2007, 79, 293. 'Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)' on page 404 (https://doi.org/10.1351/pac200779030293)