Propertiesof Ammonium Ion–Water Clusters:Analyses of Structure Evolution, Noncovalent Interactions, and Temperatureand Humidity Effects. - Pei, Shi-Tu; Jiang, Shuai; Liu, Yi-Rong; Huang, Teng; Xu, Kang-Ming; Wen, Hui; Zhu, Yu-Peng; Huang, Wei (Journal of Physical Chemistry A, 2015)