Digital conversion and data acquisition

The entities and parameters important in the selection process are the number of available input channels, signal conditioning capabilities, analogue input amplification control, converter resolution and speed, and overall system accuracy  

The converted digital signal is subsequently handled in the PC by data acquisition and analysis software. There are a wide range of commercial programs available for the task, far too many even to try to list them here, and users often write their own problem-oriented codes. The only comment that we would like to make here is that computer-aided data acquisition makes accumulation over long periods of time much easier and averaging and noise-reduction routines can be used to improve on the signal quality. 

Laser Studies of Photo-dissociation, Photoionization and Unimolecular Processes 

PART 4 LASER STUDIES OF PHOTODISSOCIATION, PHOTOIONIZATION AND UNIMOLECULAR PROCESSES 

Lasers are the precision tools of photochemistry and they have been used to both pump (initiate) and probe (analyse) chemical processes on time-scales that are short enough to allow the direct observation of intramolecular motion and fragmentation (i.e. on the femtosecond time-scale). Thus, laser-based techniques provide us with one of the most direct and effective methods for investigating the mechanisms and dynamics of fundamental processes, such as photodissociation, photoionization and unimolecu-lar reactions. Avery wide variety of molecular systems have now been studied using laser techniques, and only a few selected examples can be described here. 

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