... Only C&6 and C6D6 mOleCUl€!S below -150 "c and all The Journal of Physical Chemistry, Vol. 86, No. 26, 1982 5089 ... (b) Lahwald, S.; Ibach, H.; Demuth, J. E. Surf. Sci. 1978, 78, 577. (c) Netzer, F. P.; Matthew, JAD Solid State Commun. 1979,29, 209. ...