HOLE BURNING LINE SHAPES IN A TWO-DIMENSIONAL GLASS A MODEL FOR HOLE BURNING LINE SHAPES OF MOLECULES ON SURFACES

A method for calculating the low temperature, hole burning line shapes of molecules in a two-dimensional g ass in presented. An extension of the standard ynamic model for three-dimensional glasses i employed. A calculation of the 2-D spatial average with the proper correlation function description predicts non-Lorentzian hole profiles (narrower near the peak, broader in the wings) due to the reduction in dimensionality. A steeper power law, Au=&, is predicted for two-dimensional linewidths, com-pared to standard three-dimensional results. These results afe in qualitative agreement with recent experiments of molecules on surfaces. 1