Electronic Structure of n-Cycloparaphenylenes Directly Observed by Photoemission Spectroscopy

A series of n-cycloparaphenylenes ([n]CPP) were studied by ultraviolet photoemission, inverse photoemission, ultraviolet-visible absorption, and X-ray photoemission spectroscopy to detect their unique electronic structures. [n]CPP has a cyclic structure in...

Unoccupied electronic band structure of pentagonal Si nanoribbons on Ag(110)

The unoccupied band structure of silicon nanoribbons on Ag(110) was investigated using k-resolved inverse photoemission spectroscopy and DFT calculations.

Sulfur Segregation and Surface Site Vacancy Compensation During Methanol to Methoxy Reactions on MoS2

ABSTRACTSulfur loss from the surface of MoS2(0001) is observed following the adsorption of methanol on MoS2 at 86 K and subsequent annealing of MoS2 near 300 K. This sulfur loss, at the MoS2 surface, leads to suppression of inverse photoemission features characteristic of the unoccupied states associated with MoS2. This sulfur loss is counteracted by further annealing to 350 K, as is evident in the temperature dependent sulfur to molybdenum integrated X-ray photoemission intensity ratios near 300 to 350 K. Upon further annealing to 350 K, inverse photoemission additionally indicates a reestablishment of characteristic features associated with the unoccupied states of MoS2. These results are indicative of sulfur segregation to the surface and compensation of surface vacancy sites.