The photo-induced pyrolysis of ethylene in a cw CO2 laser beam

✍ Scribed by J.Tardieu de Maleissye; F. Lempereur; C. Marsal

• Publisher: Elsevier Science
• Year: 1976
• Tongue: English
• Weight: 364 KB
• Volume: 42
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(76)80656-2

✦ Synopsis

Ethylene ,oas was irradiated using a 660 W/cm* cw CO;? laser emitting at 10.6 pm. When the pressure increases, both the light absorption (0~ = 0.016 ton-' cm-' ) and the chemical decay rate reach a limiting value. Poor experimental agreement with Landau-Teller or SSH theory is observed when T changes, and the limiting reaction rate coincides with a limiting quantum yield, from which a corresponding activation energy of 192.4 kJ/mole is deduced. The qualitative mechanism of decomposition can be explained, assuming a heat cooling control of the output molecular energy deposited through the translational degrees of freedom, which is simdar to the control by heat transport of the fluorescence slow decay rate.