Abstract
The absorption cross-section of NO3 at λ= 662 nm and at room temperature was found to be (2.23 ± 0.35)× 10–17 cm2 molecule–1. Error limits are 95% confidence limits for random errors. A discharge flow apparatus was used to prepare NO3 by the reaction of F atoms with HNO3. The absolute concentration of NO3 in the absorption cell was determined by titration with NO. A stoicheiometric factor for the removal of NO3 was calculated using numerical integration of the kinetic equations derived from a simple reaction scheme. This factor is not always unity, and we indicate the consequences of erroneously assuming 1 : 1 stoicheiometry for NO3 removal by NO. The influence on the calculated value of σ of the initial concentrations of F atoms and HNO3 is discussed. The role of possible interfering reactions is also considered.
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