Theoretical study of the thermally induced structural fluctuations in sub-nanometre size gold clusters José Manuel Cabrera-Trujillo, Juan Martín Montejano-Carrizales, Faustino Aguilera-Granja and Álvaro Posada-Amarillas Eur. Phys. J. D, 69 7 (2015) 167 Published online: 02 July 2015 DOI: 10.1140/epjd/e2015-60058-y