Investigation of InSb(110) and InSb(111) surfaces by means of target current (VLEED) spectroscopy and LEED

Dittmar-Wituski, Adam; Grudziński, A.; Lademann, Ł.; Mikołajczyk, Alicja; Andraszyk, Ł.; Roszak, M.

doi:10.1016/j.apsusc.2010.01.105

Cited by 6 publications

(3 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The energy scale was calibrated by referring to the maximum of the primary peak in TCS spectra which determines the vacuum level (VL) location. The maxima in the negative second derivative of electron current transmitted through the sample, i.e., −d 2 J /d E 2 , are found ,− to be related to maxima of DOUS and could be revealed by the present experiments starting from a few electronvolts above the VL.…”

Section: Experimental Methodssupporting

confidence: 59%

“…TCS measurements were carried out during the film deposition until the film thickness reached 10–13 nm. The attenuation of the substrate spectrum also provided information on the thickness of the organic overlayer. , The AES analysis revealed a good agreement between atomic composition of the films and chemical structure of the molecules. Due to the fact that no LEED patterns from the films were observed, we conclude on formation of the disordered molecular films.…”

Section: Experimental Methodsmentioning

confidence: 90%

“…This technique provides a convenient measurement scheme within the VLEED method. , The experiments were performed in an ultrahigh vacuum system (base pressure of 10 –7 Pa) where Auger electron spectroscopy (AES) and low energy electron diffraction (LEED) units were installed. An incident electron beam was normally directed onto the solid sample giving a spot of 0.2–0.4 mm in diameter on the surface.…”

Section: Experimental Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Relation between Electron Scattering Resonances of Isolated NTCDA Molecules and Maxima in the Density of Unoccupied States of Condensed NTCDA Layers

Pshenichnyuk

Komolov

2011

J. Phys. Chem. A

View full text Add to dashboard Cite

The empty-level structure of the 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTCDA) molecule is characterized by means of dissociative electron attachment (DEA) experiments in the gas phase coupled with DFT calculations. Distinct maxima in the anion currents generated by electron attachment to NTCDA, as a function of incident electron energy, are ascribed to capture of incident electrons into empty orbitals, i.e., the process referred to as shape resonance. The empty orbital energies of gas-phase NTCDA shifted to 1.2 eV lower energy reproduce satisfactorily the maxima of the unoccupied electronic states of a multilayer NTCDA film measured by means of the very low energy electron diffraction method and the total current spectroscopy measurement scheme. The present results indicate that the empty levels of individual NTCDA molecules are stabilized in the solid state, but their relative energies remain nearly unaltered. The stabilization energy in multilayer film of NTCDA molecules is likely due to attractive polarization forces. Fragmentation of the gas-phase NTCDA temporary parent anions via the DEA mechanism, the other issue of the present investigation, leads to the rupture of the bonds between the end carbonyl groups and the naphthalene core, and occurs at incident electron energies above 2 eV. Possible chemical changes in condensed NTCDA molecules initiated by the DEA mechanism under conditions of electron transport through the film are discussed.

show abstract