Na and Cl2 Interaction on it and 2H–TaSe2(0001) Surfaces

Abstract

In this paper we study the interaction of Cl 2 and Na on 1T– TaSe 2 and 2H– TaSe 2(0001) surfaces in the temperature range of 100–300 K. The experiments are performed in UHV with the use of LEED and SXPS by synchrotron radiation measurements. Deposition of Na on Cl 2-covered 1T– TaSe 2 at 100 K forms initially a [Formula: see text], which with increasing temperature to 300 K leads to NaCl formation. Adsorption of Cl 2 on Na-intercalated 1T and 2H– TaSe 2 surfaces at 100 K forms Cl 2 multilayers. The first Cl 2 layer, in contact with the substrate, interacts with the Na near the surface and forms [Formula: see text]. Warming up to 300 K leads to partial desorption of Cl 2, while the remaining chlorine interacts strongly with Na, causing the deintercalation of Na to the surface in the tendency to form NaCl. The intercalation–deintercalation process takes place across the van der Waals planes and it is much faster on 2H than on 1T– TaSe 2, which is attributed to the different crystal structure of 2H and 1T of TaSe 2.