The photolysis of N₂O at 2139 Å and 1849 Å

Abstract

The method of chemical difference was utilized to accurately deterornine the relative importanceoof all the reaction steps in the direct photolysis of NzO at 21 39 A (25" and 250°C) and 1849 A (25" C), as well as in the Hg6('Pl)-sensitized photolysis of Nz0 at 1849 A (25°C). In all cases, the primary process is predominantly, if not exclusively,The ratio kZ/k3 was found to be 0.69 f 0.05 in all cases. When combined with other data from our laboratory, the average value is 0.65 f 0.07. This represents the value for translationally energetic O(lD) atoms. When excess He was added to remove the excess translational ehergy, kz/k3 rose to 0.83 f 0.06, which is in reasonable agreement with the value of 1.01 f 0.06 found in another laboratory. We conclude that for O(lD) atoms with no excess thermal energy, k 2 / k 3 = 0.90 f 0.10.

A photoelectric detector for the measurement of photolysis frequencies of ozone and other atmospheric molecules

“…An overview about the recent publications is given in Table III. The dependence on the addition of excess He, as was observed by Davidson et al (1979), Volltrauer et al (1979), and Simonaitis et al (1972), was attributed to the more rapid thermalization of the hot O(ID) atoms formed in reaction (1) Simonaitis et al (1972) 0.69 ± 0.05 pure N20 0.83 ± 0.06 He/N20 mixture Ghormley et aL (t973) 0.70±0.02 Volltrauer et al (1979) 0.73 ± 0.11 pure N20 0.92 ± 0.1 He/N20 mixture Davidson et al (1979) 0.68 ± 0.1 pure N20 0.80 ± 0.1 He/N20 mixture Marx et al (1979) 0.62 ± 0.04 He/N~O mixture no He effect observed Lam el al. (1981) 0.62 ±0.2 pure N20 and He/N20 no He effect observed 225 little excess kinetic energy.…”

Comparison between experimental and calculated results on the decomposition of chemically activated alcohols

“…For the former this is just about the maximum available on the basis of the conservation laws. The presence of excess translational energy in O(l0) from N 2 0 photolysis at 2139 A has been suggested by Heicklen and coworkers [19]. If this is the case, then the excess energy must appear in the insertion process since such reactions…”

Ultraviolet absorption spectrum of nitrous oxide as a function of temperature and isotopic substitution

“…There have been other studies of its near UV spec-2-6 7-11 . trum, its vacuum UV absorption spectrum, and its photodissociat " [12][13][14][15][16][17][18][19][20] 10n.…”