ISSN:
0538-8066
Keywords:
Chemistry
;
Physical Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Singlet molecular oxygen, O2(1Σg+), is one of the important 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-discharge/optical-emission technique. By monitoring the characteristic emission (762 nm for 1Σg+), the quenching rates for several important molecules have been obtained at room temperature. The following table summarizes measurements. TextQuencherRate Constants (cm3/s)CH2(4.6 ± 0.5) × 10-13H2(7.0 ± 0.3) × 10-13N2(1.7 ± 0.1) × 10-15Cl2(4.5 ± 0.8) × 10-16CO(4.5 ± 0.5) × 10-15O3(2.2 ± 0.3) × 10-112,3 DBM-2(6.0 ± 0.1) × 10-13The error limits represent one standard deviation. The systematic error is estimated to be about 15%. For CO2 and O3 molecules, the quenching rate constants were also measured in the temperature range of 245-362 K. In both reactions, negligible temperature dependences (with the activation energy less than 0.6 kcal/mole) were observed.
Additional Material:
7 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/kin.550171102
Permalink