Relaxation of ArH+ by collision with He: Isotopic effects Ricardo M. García-Vázquez, Maykel Márquez-Mijares, Jesús Rubayo-Soneira and Otoniel Denis-Alpizar A&A, 631 (2019) A86 Published online: 24 October 2019 DOI: 10.1051/0004-6361/201935712