Experimental evidence for the entropy effect in Coulombic cluster fission

被引：27

作者：

Brechignac, C ^{[1
]}

Cahuzac, P ^{[1
]}

deFrutos, M ^{[1
]}

Kebaili, N ^{[1
]}

Sarfati, A ^{[1
]}

Akulin, V ^{[1
]}

机构：

[1] MOSCOW INST PHYS & TECHNOL,MOSCOW,RUSSIA

来源：

PHYSICAL REVIEW LETTERS | 1996年 / 77卷 / 02期

关键词：

D O I：

10.1103/PhysRevLett.77.251

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Coulombic fission of warmed triply charged potassium ion clusters K-n(3+), with n = 54-105, is studied by unimolecular dissociation mass spectroscopy. Binary fission is shown to occur predominantly with an asymmetrical character which attenuates as the size of the cluster increases. Such a result cannot be interpreted by energetic considerations unless the entropy contribution of discrete atoms is taken into account.

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页码：251 / 254

页数：4

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