Von Weisacker

The first term is the local Thomas-Fermi energy and the second gives the von Weisacker quantum correction [11]. A value j8 = 0.5 for the coefficient in this term has been found convenient for jellium clusters [85]. The results obtained for B are in good agreement with those from a full Kohn-Sham calculation. The ETF method is also useful to calculate the fission barrier F for very large clusters [86], where the importance of shell effects is expected to decrease and a full KS calculation becomes tedious. 

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