Size fluctuations of near critical and Gibbs free energy for nucleation of BDA on Cu(001)

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Schwarz, D. and Gastel, R. van and Zandvliet, H.J.W. and Poelsema, B. (2012) Size fluctuations of near critical and Gibbs free energy for nucleation of BDA on Cu(001). Physical review letters, 109 (1). 016101 - . ISSN 0031-9007

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Abstract:We present a low-energy electron microscopy study of nucleation and growth of BDA on Cu(001) at low supersaturation. At sufficiently high coverage, a dilute BDA phase coexists with c(8×8) crystallites. The real-time microscopic information allows a direct visualization of near-critical nuclei, determination of the supersaturation and the line tension of the crystallites, and, thus, derivation of the Gibbs free energy for nucleation. The resulting critical nucleus size nicely agrees with the measured value. Nuclei up to 4-6 times larger still decay with finite probability, urging reconsideration of the classic perception of a critical nucleus.
Item Type:Article
Copyright:© 2012 American Physical Society
Faculty:
Science and Technology (TNW)
Link to this item:http://purl.utwente.nl/publications/81096
Official URL:http://dx.doi.org/10.1103/PhysRevLett.109.016101
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