Dissociative recombination of CH⁺

Abstract

Dissociative recombination afCH* is studied by using the multichannel quantum defect theory (MQDT). The relevant electronic states were calculated by adopting the self-consistent field (SCF) and the configuration mixing ( C M ) methods. Particular care was taken to represent correctly the diffuse character of the excited states, especially of the two-electron excited states. The dissociative state coupled with the initial channel was found to cross the lowest potential of CH* near the left turning point of the first excited vibrational state. We took into account both the p n and d n partial waves ofthe incident electron in the MQDT treatment. For this purpose. we modified the MQDT formulation by Giuiti so as to fully describe the angular parts. The rate constant obtained is 1 . 1 2 ~ IO-'cm's-' at 120 K, which is about one third of the experimental value of Mitchell andMcGowan. The contribution of the d a wave was found to be comparable to that of the D n wave.

Theoretical study of the dissociative recombination ofHeH+

“…The MQDT with rotational and vibrational motion has been well established [11][12][13]. We here utilize the method proposed in the previous study by Takagi [13], which is referred to as I hereafter.…”

New resonances in the dissociative recombination of vibrationally coldCD+

“…Several theoretical approaches have been used to calculate the DR of CH+ in the low energy domain (E (0. 3 eV) [2]. Experimentally, the DR cross section was measured by Mul et aL [3] over an energy interval 0.03 to 0.4 eV, using an ion source with a paramagnetic buffer gas to quench the metastable asII state and a merged electron-ion beam technique.…”

Nonequilibrium Chemistry and Radiation for Neptune Entry

“…(4a-4c) have been studied experimentally by Mul et al [14] and Amity and Zajfman [15]. Theoretical study was made by Takagi et al [16]. In Fig.…”

“…CH + + e -> C + H cross section experiment, total, Mul et al[14] experiment, total, Amity and Zajfman[15] theory, total, Takagi et al[16] present fit…”