Radiative rates and electron impact excitation rates for H-like Ar XVIII K. M. Aggarwal, K. Hamada, A. Igarashi, V. Jonauskas, F. P. Keenan and S. Nakazaki A&A, 487 1 (2008) 383-388 Published online: 29 May 2008 DOI: 10.1051/0004-6361:200810001