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Two-dimensional melting of physisorbed submonolayers of argon and nitrogen
Authors:S. C. Sharma  N. Hozhabri
Affiliation:(1) Center for Positron Studies, Department of Physics, The University of Texas at Arlington, 76019 Arlington, TX, USA
Abstract:We have studied two-dimensional argon and nitrogen physisorbed on grafoil by conducting positron lifetime and Doppler broadening measurements as functions of adsorbate coverage and temperature. Positron lifetime and Doppler broadening parameters show turnarounds near one-half monolayer coverages at 77 K. The s parameter of the Doppler broadening spectra measured for one-half monolayer coverages of argon and nitrogen increases with temperature across the melting phase transition. We discuss the observed coverage and temperature effects following models based on Kosterlitz-Thouless-Nelson-Halperin-Young theory of two dimensional melting and positron localization in surface defects.
Keywords:78.70.Bj  36.10.Dr  71.60+z
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