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The difficulty to reproduce the measured data by a classic-theoretical calculations of mobility of nitrogen ions in dilute atom-gas of helium at low temperatures mentioned in the work of Tanuma group [H. Tanuma, S. Matoba and K. Ohtsuki<http://dpsalvia.nifs.ac.jp/amdsoc/h201217/Tanuma_081217.pdf>], prompted us to try quantum calculations to minimize this failure. To do this, we have carried out the calculations of the potential-energy curves of the low lying states corresponding to the N⁺+He ion-atom system using the SA-CASSCF with MRCI ab initio methods including the Davidson and BSSE corrections. The transport coefficients of the N⁺(³P) and N⁺(¹D) ions in He atom are then carefully determined with special emphasis on the behavior of the reduced mobility with the ratio E/N of the electric field and the gas density and try to explain its observed decrease near the value E/N∼10Td .

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I hope this article makes what people might think is a boring, slightly abstract area like health economics and measuring things like health, kind of interesting and maybe even exciting. More than anything else, and if nothing else, I hope you find this article thought-provoking.

Dr Syhem Lias
Universite des Sciences et de la Technologie Houari Boumediene

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This page is a summary of: Quantum-mechanical transport properties of N+ (3p) and N+ (1D) ions in a neutral gas made of helium, Molecular Physics, August 2019, Taylor & Francis,
DOI: 10.1080/00268976.2019.1657601.
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