Comparison of UV and high-energy ion irradiation of methanol:ammonia ice G. M. Muñoz Caro, E. Dartois, P. Boduch, H. Rothard, A. Domaracka and A. Jiménez-Escobar A&A, 566 (2014) A93 Published online: 20 June 2014 DOI: 10.1051/0004-6361/201322983