Observations of the Ramsauer–Townsend effect in quaternionic quantum mechanics Hadi Sobhani, Hassan Hassanabadi and Won Sang Chung Eur. Phys. J. C, 77 6 (2017) 425 Published online: 24 June 2017 DOI: 10.1140/epjc/s10052-017-4990-7