High Intensity Ultraviolet Light Research Articles

Identification of the Photoalteration Products Formed from Parathion by Ultraviolet Light

Abstract A comparison of the effects of various time periods of ultraviolet light on the formation of rearrangement products of parathion is presented. Twelve products were separated and identified by thin layer chromatography in 4 systems, and were confirmed by infrared spectroscopy, when possible. The effect of 2 solvents, methanol and acetone, on the formation and percentage composition of photoalteration products of parathion from high-intensity ultraviolet light is also discussed. Retention times are given for each component from gas chromatography by electron capture and flame photometric detection.

Luminescent Rise Times of Inorganic Phosphors Excited by High Intensity Ultraviolet Light

The relative delay between excitation and luminescence was measured for a number of common inorganic phosphors using short, high intensity excitation pulses. The delays were found to be much shorter than anticipated; on the basis of low intensity pulsed luminescence measurements and were found to be extremely intensity-dependent. Both the luminescence rise and decay times were found to be intensitydependent as well, with the luminescence pulse waveform tending to approach the exciting pulse at the higher excitation intensities.

High stability and high intensity ultraviolet plasma light source for molecular spectroscopy

A plasma arc light source is described, the characteristic properties of which are produced by an auxiliary electrode which generates a localized constriction and stabilization of the plasma column.

Inactivation of pepsin by high intensity ultraviolet light and the reciprocity law

A test of the reciprocity law for the inactivation of pepsin was performed and found to hold with intensities in the neighborhood of 100,000 times those customarily employed. An apparatus for obtaining such intensities is described.