science-softCon uv/vis+ photochemistry database;	www.photochemistry.org; (C) science-softCon 2019

Substance: dichlorine tetraoxide			Other Names:

Formula: Cl2O4						CAS-No.: 27218-16-2

Study: uv absorption spectra

                
Authors: T.J. Green, M. Islam, C. Canosa-Mas, G. Marston, R.P. Wayne

Title: Higher oxides of chlorine: absorption cross sections of Cl2O6 and Cl2O4, the decomposition of Cl2O6, and the reactions of OClO with O and O3

Journal/Source: J. Photochem. Photobiol. A: Chem., 162, 353-370, (2004); http://dx.doi.org/10.1016/S1010-6030(03)00379-4
 

Data: table, diagram

Energy/Wavelength range: 200 - 350 nm

Resolution: 

Temperature: 298 K

Temperature dependence: no

Pressure/Concentration: 

Phase: gas

pH:


Comments: The absorption cross-sections of Cl2O6 and Cl2O4 have been obtained using a fast flow reactor with a diode array 
spectrometer (DAS) detection system. The absorption cross-sections at the wavelengths of maximum absorption determined in 
this study are those of Cl2O6: (1.47±0.15)×10-17 cm2 molecule-1, at lambda(max)=276 nm and T=298 K; and Cl2O4: (9.0±2.0)×10-19 cm2 molecule-1, 
at lambda(max)=234 nm and T=298 K. Errors quoted are two standard deviations together with estimates of the systematic error. 
The shapes of the absorption spectra were obtained over the wavelength range 200-450 nm for Cl2O6 and 200-350 nm for Cl2O4, 
and were normalized to the absolute cross-sections obtained at lambda(max) for each oxide, and are presented at 1 nm intervals. These 
data are discussed in relation to previous measurements.

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