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In this research photolysis of NO 2, N 2 O and HNO 3 for vast range of altitudes was investigated using the absorption cross-section data provided by NASA. The calculations were made using a special software computer program. Also the lifetimes of NO 2, N 2 O and HNO 3 were calculated. The investigation revealed that the lifetime due to photolysis will be nearly steady and short for NO 2, and will be as long (as there is no overlap with solar fluxes below 50 km altitude) for N 2 O . As for nitric acid HNO 3 the lifetime started to increase from 1 day at 25 km altitude to 10 days at the surface of the earth.

In this work, a comprehensive study of the molecular spectroscopy of vinyl chloride is reported. A high resolution VUV photo absorption spectrum of vinyl chloride has been measured using a synchrotron radiation in the range (5-11) eV (115 > λ > 250) nm. The excited Rydberg states of vinyl chloride were calculated using a software program. The photolysis has also been investigated to give an estimate of the life time in the atmosphere.