intensitiesafter

Intensitiesafter is a term used in data analysis to describe the set of intensity measurements recorded after a specified event or trigger in a time-resolved experiment. It is often used in contrast to intensitiesbefore, which covers measurements taken prior to the event. While not a universally standardized term, intensitiesafter appears in documentation and data schemas for imaging, spectroscopy, and astronomy workflows to label post-event signal.

In a typical data set, intensitiesafter consists of a sequence of intensity values indexed by time or frame number, with the corresponding time axis offset so that the trigger time defines t=0. The data may be stored as a separate array or as a masked view of the full intensity series. Analysts may also compute derived quantities such as the decay curve, integrated post-event signal, or normalized intensities after baseline subtraction.

Computation often involves selecting all samples with time greater than the trigger, optionally applying a lag or window to capture immediate post-event behavior. Preprocessing steps include background subtraction, smoothing, and correction for instrument response. Intensitiesafter can be used directly or as input to fits of exponential or multi-exponential decay models, integral metrics, or time-resolved comparisons.

Applications span time-resolved fluorescence, pump-probe spectroscopy, scintillation detectors, and astronomical afterglow studies, where the post-event signal carries information about dynamics, lifetimes, or material properties. Limitations include dependence on precise event timing, potential contamination by ongoing illumination, and noise amplification in late-time data.

See also: intensitiesbefore, decay curve, time-resolved spectroscopy, afterglow.