Description
Title: Atomic and ionic data on cobalt-hydrogen collisions
Abstract: The quantum simplified model is used to calculate the rate coefficients for inelastic processes in low-energy Co + H, Co+ + H, Co+ + H, and Co2+ + H collisions. 91 molecular states of CoH+ and 44 triplet and 55 quintet states of CoH are taken into account. The estimations give the rate coefficients for the 13, 052 processes total—4862 partial processes in the neutral CoH system and 8, 190 partial processes in the ionized CoH+ system—such as mutual neutralization, ion-pair formation, excitation, and de-excitation. At T = 6000 K, the mutual neutralization processes into the Co(e2F) +H and Co+(g5F) +H final channels in the neutral and ionized systems, respectively, correspond to the rate coefficients with the largest values around 6108 cm3s1. The processes Co(y2S) +H! Co(e2F; v4D) +H and Co+(h3P) +H! Co+(g3P; g5P; g5F) +H, respectively, have the largest rate coefficients among the excitation and de-excitation processes in Co + H and in Co+ + H collisions at T = 6000 K, with values around 7 109 cm3s1. The calculations highlight inelastic processes crucial for modeling Co I and Co II spectra in stellar atmospheres using non-local thermodynamic equilibrium (NLTE). After performing the test NLTE calculations, it is discovered that the new collision rates significantly affect line formation and NLTE abundance corrections.
Keywords: atomic collisional data; atomic inelastic processes; rate coefficients; stars; atmospheres
Paper Quality: SCOPUS / Web of Science Level Research Paper
Subject: Physics
Subject Category: Atomic and Molecular Physics, and Optics
Writer Experience: 20+ Years
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