Date of Award


Degree Name

Master of Science



First Advisor

Dr. John Miller

Second Advisor

Dr. Steve Bertman

Third Advisor

Dr. James Kiddle

Access Setting

Masters Thesis-Open Access


Nitric acid (HNO3) is a major sink for NOx (NO+NO2 ) and is known to be removed from the atmosphere as a result of wet and dry deposition where it is then deposited on various surfaces in the environment. As these surfaces are photolyzed HONO is produced which affects the overlying troposphere. This study examines the amount of HONO (Nitrous Acid) produced by the photolysis of adsorbed HNO3 as a function of changing relative humidity on hydrophobic, hydrophilic, and inorganic ionic salt surfaces. The amount of HONO produced was measured in long path cell using UV/Vis spectroscopy. This study also narrows down the excitation wavelength range responsible for photolysis. This was accomplished by placing a series of optical filters in-between the surface and the source of radiation. Further examination of the data reveals interesting mechanistic information for HONO production.

Included in

Chemistry Commons