Analysis of target-current-spectroscopy data of GaAs(110) with very-low-energy electron-diffraction calculations

Low-energy absorbed current and electron transmission spectroscopies of molybdenum disulfide single crystal

“…[28]) and the VLEED approach [1], where the vacuum wave function (superposition of the primary plane wave and of all diffracted beams) joins the wave function in the crystal (superposition of all Bloch's waves), appear to be more adequate. Note that multiple-scattering methods [18][19][20][21]28] are not applicable to an analysis of E(k) and, furthermore, encounter difficulties with inclusion of the full crystal potential into the calculation.…”

“…Note that straightforward model calculations [26] demonstrated that this approach is not valid for interpretation of LEET spectra of graphite (variations of rðEÞ; except the band gaps are not reflected in these spectra). The dynamic theory of LEED [18][19][20][21] (an alternative scatteringmatrix formalism in dynamic LEED theory is presented in Ref. [28]) and the VLEED approach [1], where the vacuum wave function (superposition of the primary plane wave and of all diffracted beams) joins the wave function in the crystal (superposition of all Bloch's waves), appear to be more adequate.…”

“…There are several approaches to the interpretation of spectral features. In the first approach, the experimental TCS [14][15][16][17][18] and LEET spectra [22][23][24] are compared with the calculated density of unoccupied electronic states rðEÞ; the level broadening is neglected, and only the positions of spectral lines rather than their shape and intensity are analyzed; the applicability of the limiting transition to one-dimensional (or three-dimensional [15]) rðEÞ is not specified. Note that straightforward model calculations [26] demonstrated that this approach is not valid for interpretation of LEET spectra of graphite (variations of rðEÞ; except the band gaps are not reflected in these spectra).…”

“…Low-energy electrons with kinetic energies E p below 1 keV are used to study the electronic structure of unoccupied high-level electronic states in very low-energy-electron diffraction (VLEED) [1,2], bremsstrahlung isochromat [3,4], inner-shell electron-energy loss [3,5], inverse photoemission (IPES) [3,6,7], secondary-electron emission [8,9], target current (TCS) [7,[10][11][12][13][14][15][16][17][18][19][20][21], and (as a modification of TCS) low-energy-electron transmission (LEET) [22][23][24][25][26] spectroscopies. Having a high surface sensitivity and being nondestructive, the latter two methods are employed, in addition to analyzing elementary excitations and near-surface Due to the specific features of their crystal and electronic structure, lamellar transition metal dichalcogenides (TMDC) feature a number of unique properties; as a result, the related materials do not have analogs and cannot be replaced by an equivalent counterpart.…”

Overview of core and valence photoemission

“…Total current spectroscopy represents the complementary case of this method. [89,98] A simple illustration follows from the fact that the incident electron is strongly reflected by the surface in those energy regions where a gap appears in the bandstructure of the solid.…”