Abstract
Inelastic processes in low-energy Cu + H and Cu+ + H− collisions, such as mutual neutralization, ion-pair formation, excitation, and de-excitation, 306 partial processes in total, are investigated taking fine structure effects into account. We use the asymptotic approach to model the adiabatic potentials and adapt a recently proposed method to include the copper fine structure. The nuclear dynamics is performed by making use of the multichannel analytical approach and the Landau-Zener model. The rate coefficients are calculated for the temperature range 1′000 − 10′000 K. The largest rate coefficient is obtained for the mutual neutralization process Cu+ + H− → Cu(3d105s 2S1/2) + H with a value of 3.81 × 10−8 cm3/s at a temperature of 6′000 K. The next lower rate coefficients with values below 10−8 cm3/s correspond to the partial processes of mutual neutralization ${\rm Cu}^{+} + {\rm H}^- \rightarrow {\rm Cu}(3d^{10}5p~^2P^{\circ }_{3/2, 1/2}) + {\rm H}$, Cu+ + H− → Cu(3d104d 2D3/2, 5/2) + H, and the de-excitation process ${\rm Cu}(3d^{10}4p~^2P^{\circ }_{1/2}) + {\rm H} \rightarrow {\rm Cu}(3d^{9}4s^2~^2D^{\circ }_{3/2, 5/2}) + {\rm H}$. It is shown that the practice to redistribute LS-coupling rate coefficients among fine structure sublevels can give rates which deviate significantly from those calculated in the JJ-coupling scheme, that is, with account for the fine structure effects.
Large cooperativity in strongly coupled chip-scale photonic-atomic integrated system
