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Collisional excitation of interstellar PO(X 2 Π) by He: new ab initio potential energy surfaces and scattering calculations.
Physical Chemistry Chemical Physics : PCCP 2018 Februrary 22
We present the first ab initio potential energy surfaces (PESs) for the PO(X2 Π)-He van der Waals system. The PESs were obtained using the open-shell partially spin-restricted coupled cluster approach with single, double and perturbative triple excitations [UCCSD(T)]. The augmented correlation-consistent polarized valence triple-zeta (aug-cc-pVTZ) basis set was employed supplemented by mid-bond functions. Integral and differential cross sections for the rotational excitation in PO-He collisions were calculated using the new PES and compared with results in similar systems. Finally, our work presents the first hyperfine-resolved cross sections for this system that are needed for accurate modelling in astrophysical environments.
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