Astrochemical modelling of infrared dark clouds N. Entekhabi, J. C. Tan, G. Cosentino, C-J. Hsu, P. Caselli, C. Walsh, W. Lim, J. D. Henshaw, A. T. Barnes, F. Fontani and I. Jiménez-Serra A&A, 662 (2022) A39 Published online: 14 June 2022 DOI: 10.1051/0004-6361/202142601