Pulse-sampling technique

In the strobe or pulse sampling technique, the sample is excited with a pulsed light source. The intensity of the fluorescence emission is measured in a very narrow time window on each pulse and saved on the computer. The time window is moved after each pulse. When data have been sampled over the appropriate range of time, a decay curve of emission intensity vs. time can be constructed. 

Thermal Electron Attachment Studies by the Pulse-Sampling Technique... 

The pulse-sampling technique is quite simple both in principle and practice. The temperature dependence of the rate constant can be evaluated readily. For the two compounds investigated in detail, perfluoromethylcyclohexane had an Arrhenius activation energy of 1.7 kcal., whereas the value for SF6 was 0.9 kcal. 

Wentworth, W.E. Chen, E. Lovelock, J.E., The pulse-sampling technique for the study of electron attachment phenomena, J. Phys. Chem. 1966, 70, 445-458. 

The majority of detectors with radioisotope sources in current use are based on either the coaxial cylinder or asymmetric configurations, as shown in Figure 3. The low specific activity of the Ni source requires a relatively larger source area to provide a suitable background current that is easier to accommodate in these designs. Virtually all contemporary detectors employ pulse-sampling techniques to collect the thermal electrons based on the variable frequency constant... 

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