Spatial characterization of pulsed and continuous atom sources

Atomic spectroscopic methods have been widely accepted for the analyses of many elements. Optimizations of the analytical signals require thorough fundamental understanding of each elemental step involved in a particular measurement. Important parameters such as spatially resolved temperature and concentration profiles of the atomizers are necessary for researchers to study the efficiency of free atom production, the dissociation and excitation processes, and the effects of interferences. A new concept for the determination of spatially resolved vibrational temperatures is demonstrated. A collimated laser beam is coupled to a vidicon camera to allow spatial mapping of absorption in flames. Vibrational temperature for each spatial location of the flame can be calculated by measuring the relative intensities of absorption from different vibrational levels in the ground states of the molecules. Temperature information generated by this system is very helpful to the understanding of dissociation and recombination of molecules in flames. Finally, a new imaging instrument based on an acousto-optic deflector is developed for diagnostic studies of pulsed atom sources. This device has the capability of deflecting a laser beam across a spatial region of interest in the microsecond regime so that transient events can be recorded in real-time