The Kinetic Study of Energy Transfer Reaction He(2³S)+CH₂Cl₂ in a Beam-Gas Condition

The reaction or H₂Cl₂ by collission with He(2³S) has been studied in beam-gas conditions. The emissions of CH(A²Δ-X³Π, B²Σ^--X²Π, i>C²Σ⁺-X²Π) and H^* (Balmer line) were observed. The nascent vibrational distribution ofCH(A) from He(2³S)/CH₂Cl₂ was determinedto be N₀:N₁:N₂=100:40±5:19±2. The rotational distribution were expressed by 3300 ± 300(N'> 8), 2800 ± 500K, and 1900 ± 500K for v'=0,1,2 of CH(A) and 3300 ± 400K for v'=0 ofCH(B). The rotational temperature is lower (2000 ± 200K) at N'<8 of CH(A,v'=0). The double Boltzmann distribution of CH(A) is not due to collision rclaxation. The formation rate constants of CH(A,B,C), CCl(A) and H^*from He(2³S)/CH₂Cl₂ reaction were determined. The mechanism of above reaction were also disscused.