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Rotational cross sections and rate coefficients of $mathrm{CP}(mathrm{X}^{2}varSigma ^{+})$ induced by its collision with He(1S)$mathrm{He}(^{1}S)$ at low temperature
Authors:Théophile Tchakoua  Mama Pamboundom  Berthelot Said Duvalier Ramlina Vamhindi  Serge Guy Nana Engo  Ousmanou Motapon  Mama Nsangou
Affiliation:1.National Radiation Protection Agency of Cameroon,Yaounde,Cameroon;2.Department of Physics, Faculty of Science,University of Ngaoundere,Ngaoundere,Cameroon;3.LPF, DFU Mathematics, Applied Computer Science and Fundamental Physics,University of Douala,Douala,Cameroon;4.Higher Teacher’s Training College,The University of Maroua,Maroua,Cameroon
Abstract:The potential energy surface (PES) for the (mathrm{CP}(mathrm{X}^{2}varSigma^{+}))-(mathrm{He}(^{1}S)) complex has been calculated at the RCCSD(T)-F12/VTZ-F12 level of theory. The analytic fit of the PES was obtained by using global analytical method. The fitted PES was used subsequently in the close-coupling approach for the computation of the state-to-state collisional excitation cross sections of the fine-structure levels of the CP-He complex. Collision energies were taken up to 1500 cm?1 and they yield after thermal averaging, state-to-state rate coefficients up to 200 K. The propensity rules between the lowest fine-structure levels were studied. These rules show, on one hand, a strong propensity in favour of even (Delta N) transitions, and the other hand, that cross sections and collisional rate coefficients for (Delta j =Delta N) transitions are larger than those for (Delta jneq Delta N) transitions.
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