title: Gallium cluster "magic melters".
abstract: Calorimetry measurements (using a method based on multicollision induced dissociation) have been performed for unsupported gallium clusters, Gan+ (n = 30-50 and 55). Melting transitions have been identified from spikes in the heat capacities recorded as a function of temperature. There are enormous fluctuations in the melting temperatures and the heats of fusion with cluster size. Clusters with n = 31, 33, 37, and 45-47 are "magic melters" with particularly well-defined melting transitions. There is a strong correlation between the heats of fusion, entropies of fusion, and the stabilities of the clusters. However, these quantities are not strongly correlated with the melting temperatures.
authors.affiliation: Chemistry Department, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405-7102, USA.
authors.forename: Gary A
authors.initials: GA
authors.lastname: Breaux
authors.forename: Damon A
authors.initials: DA
authors.lastname: Hillman
authors.forename: Colleen M
authors.initials: CM
authors.lastname: Neal
authors.forename: Robert C
authors.initials: RC
authors.lastname: Benirschke
authors.forename: Martin F
authors.initials: MF
authors.lastname: Jarrold