Abstract
Experimental and theoretical studies were made of mechanisms of the influence of the gas pressure on isotopically selective multiphoton dissociation of CF3Br by pulsed CO2 laser radiation. The dissociation yields and selectivity were determined at three different frequencies [9P(18), 9P(24), and 9P(32) lines of a CO2 laser] corresponding to preferential excitation of 13CF3Br. A simple four-level model is proposed to describe these dependences and take into account rotational relaxation and intermolecular vibrational exchange. As a result of these processes, the rotational and vibrational bottleneck is overcome. A sharp drop in the dissociation selectivity when a specific gas pressure is exceeded is due to an explosive increase in the multiphoton dissociation yield of the nonresonant isotopic component (12CF3Br) due to its vibrational self-heating.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
