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Vaporization of Solids: Evidence for a Zipper Mechanism in the Retarded Vaporization of Arsenic

Carl A. Hultman and Gerd M. Rosenblatt
Science
New Series, Vol. 188, No. 4184 (Apr. 11, 1975), pp. 145-147
Stable URL: http://www.jstor.org/stable/1739895
Page Count: 3
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Vaporization of Solids: Evidence for a Zipper Mechanism in the Retarded Vaporization of Arsenic
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Abstract

Recent observations indicate that the rate of evaporation of elemental arsenic into a vacuum is determined by the rate of formation, at screw dislocations, of kinks in ledges of molecular height. Once formed, a kink advances along the ledge, which makes a continuous spiral ramp outward from the dislocation, until the ledge terminates. A kink advances by releasing As$_{4}$ molecules from the ledge. A given kink releases almost 10$^{6}$ As$_{4}$ molecules before the next kink is initiated.

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