A Study of N2O5 and NO3 Chemistry and the Photolysis of N2O5 Mixtures

摘要: Results are presented from a recent study of the chemical behaviour NO3 and N2O5 in flowing mixtures N2O5. The absorption spectrum has been determined photolysis Cl2, ClNO3 NO2 mixtures. NO2, N2 O5 have observed directly by their U.V.-visible absorptions. were photolysed using low pressure Hg lamps driven novel ‘oblong’ wave generator: $$ \begin{array}{*{20}c} {\text{N}_\text{2} \text{O}_\text{5} \text{ + hv(254nm)}} \hfill & { - > } {\text{NO}_\text{2} NO}_3 {1\text{a}} \\ {} {\text{O NO}_\text{2} {1\text{b}} {\text{NO O}_\text{2} {1\text{c}} {\text{quenching}} {1\text{d}} \end{array} $$ In limited set experiments equilibrium for reactions (2) (−2), $$\text{N}_\text{2} M = NO}_\text{3} M} $$ (2) was investigated at 294K 30 torr, where $${{\text{K}}_{\text{2}}}{\text{ }}[{\text{N}}{{\text{O}}_{\text{2}}}] \times [{\text{N}}{{\text{O}}_{\text{3}}}]/[{{\text{N}}_{\text{2}}}{{\text{O}}_{\text{5}}}]$$ The value obtained K2 is good agreement with literature value. recombination reaction k−2 studied or F2, HNO3 between 20 40 torr. system simulated LARKIN Computer program. Analysis yields following branching ratios: $$\text{K}_{\text{1a}} / K}_\text{1} 0}\text{.75 }\,\text{and }\,\text{(K}_{\text{1b}} K}_{\text{1c}} \text{)/K}_\text{1} 0}\text{.25} $$ for an concentration 4 × l014molecule cm−3.