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- W1620299818 abstract "By using a step-scan Fourier transform spectrometer, we have studied collisionally-induced rotational energy transfer (RET) of the CH A(2Δ) (N⩽16,v=0) and B(2Σ−) (N⩽16,v=0) states. The collision partners used for the B state are He, Ar, N2, CO, N2O, and CHBr3, while He and Ar are for the A state. The time-resolved spectra obtained in the nanosecond regime may yield the RET information straightforward under a single pressure of the collider. The resultant RET rate constants for both states range from 10−12 to 10−10 cm3 molecule−1 s−1, comparable to the gas kinetic. The trend follows the order of He∼Ar<N2∼CO<N2O<CHBr3 for the B state, and He<Ar for the A state. For the B state, the findings of multi-quantum changing collisions up to ΔN=±3 and markedly large rate constants imply that the RET collisions are dominated by long-range attractive force. The collision complexes possibly formed between the CH(B) and the colliders are long-lived enough to allow for effective removal of the rotational energy more than a quantum level in a single collision. In contrast, a single quantum change in the RET collision found in the A state suggests dominance of a repulsive interaction between the colliding species, which has been verified previously in the measurements of temperature dependence of the electronic quenching." @default.
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- W1620299818 date "2000-06-15" @default.
- W1620299818 modified "2023-10-11" @default.
- W1620299818 title "Rotational energy transfer within CH A 2Δ(v=0) and B 2Σ−(v=0) states by collisions with He, Ar, N2, CO, N2O, and CHBr3 using a time-resolved Fourier transform spectrometer" @default.
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- W1620299818 doi "https://doi.org/10.1063/1.481662" @default.
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