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22 April 1993 State-to-state dynamics and doubly differential cross sections of the reaction of chlorine atoms with CH4(v3=1, J)
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Proceedings Volume 1858, Laser Techniques for State-Selected and State-to-State Chemistry; (1993) https://doi.org/10.1117/12.143111
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States
Abstract
A mixture of methane and chlorine molecules in a helium carrier is expanded into a vacuum chamber using a pulsed valve. Polarized laser photolysis of Cl2 at 355 nm is used to produce chlorine atoms with a sharply peaked speed distribution and a known angular distribution. Methane molecules are excited in the v3 mode by infrared absorption on the R(O) fundamental transition, which results in methane in the v3 equals 1, J equals 1 state. Following a 100 ns time delay to allow for reaction, HCl (v' equals 1, J') product molecules are detected by (2 + 1) resonance enhanced multiphoton ionization (REMPI). The resulting photoions are detected with both mass and velocity resolution using a linear time-of-flight mass spectrometer (TOF-MS). An analysis of the time dependence of the ion signal allows us to determine the differential scattering cross section for the specific rovibrational state ionized. The TOF data show a change in the product angular distribution with J', and thus demonstrate the importance of measuring doubly differential cross sections for elucidating the dynamics of this reaction system.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
William R. Simpson, Andrew J. Orr-Ewing, and Richard N. Zare "State-to-state dynamics and doubly differential cross sections of the reaction of chlorine atoms with CH4(v3=1, J)", Proc. SPIE 1858, Laser Techniques for State-Selected and State-to-State Chemistry, (22 April 1993); https://doi.org/10.1117/12.143111
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