Dissociation of molecular iodine in RF discharge for oxygen-iodine laser

0384697 - FZÚ 2013 RIV DE eng J - Článek v odborném periodiku
Jirásek, Vít - Schmiedberger, Josef - Čenský, Miroslav - Kodymová, Jarmila
Dissociation of molecular iodine in RF discharge for oxygen-iodine laser.
European Physical Journal D. Roč. 66, č. 4 (2012), 1-6. ISSN 1434-6060. E-ISSN 1434-6079
Grant CEP: GA ČR GA202/09/0310
Grant ostatní: European Office for Aerospace R&D(XE) FA8655-09-1-3092
Výzkumný záměr: CEZ:AV0Z10100523
Klíčová slova: molecular iodine * RF discharge * dissociation * oxygen-iodine laser * COIL
Kód oboru RIV: BH - Optika, masery a lasery
Impakt faktor: 1.513, rok: 2012

The dissociation of molecular iodine in 40 MHz-RF discharge was studied xperimentally. This generation of atomic iodine is aimed at use in oxygen-iodine lasers. The discharge was ignited in a mixture of I2 + buffer gas fast-flowing through the cylindrical chamber and the discharge products were injected into a supersonic flow of nitrogen. Argon and helium were used as a buffer gas; a discharge stability and dissociation efficiency were better with argon. At the I2 flow rate corresponding to the operation of a 1 kW chemical oxygen-iodine laser, the dissociation fraction was about 20%. The dissociation efficiency significantly decreased with increasing in the specific energy. At a reasonable I2 flow rate (0.32 mmol/s), the maximum achieved efficiency was 8.5% and the corresponding energy cost was 8.9 eV per dissociating of one I2 molecule. The obtained dependencies on the gas flow rates infer a good chance for scaling-up of the tested RF discharge generator for the intended application.
Trvalý link: http://hdl.handle.net/11104/0214258