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 |
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| Authors: | Théophile Tchakoua Mama Pamboundom Berthelot Said Duvalier Ramlina Vamhindi Serge Guy Nana Engo Ousmanou Motapon Mama Nsangou |
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| Institution: | 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 |
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| 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 \(\Delta j\neq \Delta N\) transitions. |
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