A priori checking of the light-response and data quality before extended data collection in pump– probe photocrystallography experiments

In picosecond and slower pump-probe diffraction experiments, collection of response-ratio correlation sets prior to full data collection provides an invaluable confirmation of the existence of a light-induced signal prior to full data collection. If a response to light exposure is observed, the quality of the data being collected can be assessed. A number of such correlation plots both for synchrotron and in-house pump-probe data collection are presented.