The decomposition of dimethyl peroxide (DMP) was studied in the presence and absence of added NO, to determine rate constants k l and k z in the temperature range of 391-432OK: The results reconcile the studies by Takezaki and Takeuchi, Hanst and Calvert, and Batt and McCulloch, giving log kl(sec-1
On the chaperon mechanism for association rate constants: the formation of HO2 and O3
β Scribed by A.J.C. Varandas; A.A.C.C. Pais; J.M.C. Marques; W. Wang
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 583 KB
- Volume
- 249
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
We report rate constants for the formation of HO 2 and 0 3 using the chaperon mechanism, and with Ar as scattering partner. The ArHO 2 and ArO 3 potential energy surfaces have been written as a pairwise summation of realistic EHFACE2-type potentials for interactions involving Ar and reliable global DMBE potential surfaces for chemically stable triatomic species. The calculations have been carried out using the quasiclassical trajectory approach.
π SIMILAR VOLUMES
Constants of the rawions of Cl with HIOz. IX&, 03, CH4, and HNC)J wertt mezxured at 295 K using a flaw discharge-mass spectrometric method. The rate consmts are, WpectiveIy, (6.2 ?c I.51 X 10qzS, (32&) x 10"tl, (1.3 -+. 0.3) X lo-'t, (1.2 ?t 0.3) X 10-13, and (6.8 t 3.4) X lO-is cm3/s.
The kinetics of the self-reactions of HO 2 , CF 3 CFHO 2 , and CF 3 O 2 radicals and the cross reactions of HO 2 with FO 2 , HO 2 with CF 3 CFHO 2 , and HO 2 with CF 3 O 2 radicals, were studied by pulse radiolysis combined with time resolved UV absorption spectroscopy at 295 K. The rate constants f
Electron pulse radiolysis a t -298'K of 2 atm Hz containing 5 torr 0 2 produces HOz free radical whose disappearance by reaction (I), HOz + HOz -HzOz + 0 2 , is monitored by kinetic spectrophotometry a t 230.5 nm. Using a literature value for the HOz absorption cross section, the values k = 2.5 X cm
The rate constant for the Br + O3 -+ BrO + O2 reaction was measured by the discharge flow technique, employing resonance fluorescence detection of Br. Over the temperature range 248 to 418 K, in 1 to 3 torr of He, decays of Br in excess 0, yield the value k , = (3.28 -+ 0 . 40) x 10-'1e'~944'30''T c