Effect of molecular structure on the infrared signatures of astronomically relevant PAHs J. Bouwman, P. Castellanos, M. Bulak, J. Terwisscha van Scheltinga, J. Cami, H. Linnartz and A. G. G. M. Tielens A&A, 621 (2019) A80 Published online: 11 January 2019 DOI: 10.1051/0004-6361/201834130