Singlet molecular oxygen, 02('Z,i), is one of the irqportant intermediate species in the atmospheres of Earth, Mars, and Venus. To elucidate the chemistry of this excited molecular oxygen, a series of kinetic measurements have been undertaken using the flow-dischargeioptical-emission technique. By m
Absolute rate constants for the quenching of O2(b1Σg+) by unsaturated hydrocarbons
✍ Scribed by F. Stuhl; H. Niki
- Publisher
- Elsevier Science
- Year
- 1970
- Tongue
- English
- Weight
- 339 KB
- Volume
- 5
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
Absolute rate constants for the quenching of metastable 02@lCi) by acetylene. ethylene. propylene.
butene-1, tmns-butene-2, cis-butene-2, and tetramethylethylene were determined at 300%. The rate constants range from 4 to 10 X 10 -13cm3molecule-lsec-I, and exhibit a systematic variation with molecular str&ture of the olefins.
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The rate constants for the quenching of O,('Ag) with carbon disulfide, dimethyl sulfide, dimethyl disulfide, diallyl disulfide, ethyl mercaptan, and thiophene have been determined in a discharge flow system in the absence of oxygen atoms. The rate constants are found to be (6.5 2 0.6) x lo4, (1.8 2
The rate constants for collisional quenching of Oz(b 'x:) by COz, NzO. NO, NHs\_ HCl and SOz. and of Oz(a '+.I by NO. NH3 and HCl have been measured at room tempera& by studying 'he emissions of singlet moleculx a\pg.en at 762 and 634 nm in D flowing discharge. The rate constant for deactivation of
The generation of metastable O, ('Xg+) and Oz('Ag) in the H + 0, system of reactions was studied by the flow discharge chemiluminescence detection method. In addition to the Oz('Pg') and Oz(' , H0,(2A~oo) + H02(2AlohO), H02(zA~o,) + HO,(zA~oo), and H Oz(2A~oo) --+ H0,(2A&,o) emissions were detected
A competitive technique employing the S 0 2 ( 3 B , ) photosensitized isomerization of cis-C2F2H2 to trans-C2FzH2 in the presence of selected fluorinated olefins has been used at 3712 d and 22°C to determine the quenching rate constants of the reaction S02(aB~) + M 3 removal. With tJs0, = 23.4 torr