Fig. 6From: The relation between the surface composition anomaly and distribution of the exosphere of MercuryTwo-layer scenario of the surface Na. (a) At the intermediate temperature of about 500Â K, the exosphere mainly consists of physisorbed Na atoms. (b) When the surface temperature rises, the physisorbed Na layer is depleted, and chemisorbed Na atoms populate the exosphere. Thus, correlation is considered to appear in the regions with extremely high temperatureBack to article page