Abstract
Broadband CARS technique has been employed to monitor on-line the gas-phase reactions involved in IR photodissociation of SiH 4 in the presence of different hydrocarbons (CH 4, C 2H 2, C 2H 4, C 2H 6). The experiment has been performed in a flow reactor where a low power (up to 50 W ) cw CO 2 laser tuned at 944.19 cm −1 was focused. Space-resolved detection of reactants dissociation and primary products formation has been performed on the reaction flame. Evidence of C 2 formed in ground and electronically excited states has been found. Off-line diagnostics have been used to characterize the final products, which resulted to be ultrafine Si and SiC powders with different crystalline phases according to the average reaction temperature.
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