Angle-resolved ultraviolet photoelectron spectroscopy ARUPS

A particularly useful variety of UPS is angle-resolved photoelectron spectroscopy (ARPES), also called angle-resolved ultraviolet photoelectron spectroscopy (ARUPS) [, 62]. In this technique, measurements are made of the valence band photoelectrons emitted into a small angle as the electron emission angle or photon energy is varied. This allows for the simultaneous determination of the kinetic energy and momentum of the photoelectrons with respect to the two-dimensional surface Brillouin zone. From this information, the electronic band structure of a single-crystal material can be experimentally determined. [Pg.308]

By varying the angle of incidence of the electrons their momentum (k) can be varied to produce band maps of the unoccupied states as a function of momentum that are analogous to those of the occupied states produced in angle-resolved ultraviolet photoelectron spectroscopy (ARUPS). This is known as k-resolved inverse photoemission spectroscopy (KRIPES) or angle resolved inverse photoemission spectroscopy (ARIPES). [Pg.537]

Measurement of the photoelectron intensity from single crystal samples as a function of both their kinetic energy and emission angle allows the total momentum of the photoelectrons to be determined, enabling band-maps of the electronic density of states of the material to be produced. See angle resolved ultraviolet photoelectron spectroscopy (ARUPS). [Pg.584]

This approach requires a detailed characterisation of the materials candidates to act as ET or HT layers in OLEDs. Angle Resolved Ultraviolet Photoelectron Spectroscopy (ARUPS) on ordered films provides not only their experimental electronic band structure but also parameters like ionisation potential (//>) and electron affinity Ea) that are of crucial importance in organising better OLED configurations [2-4]. In this work we investigated an amphiphilic derivative of 2,5-diphenyl-l,3,4-oxadiazole by means of Ultraviolet Photoelectron Spectroscopy (UPS) and ARUPS. This structure is based on a very stable moiety [5, 6] and the family of substituted 2,5-diphenyl-1,3,4-oxadiazole can be used as emitting as well as hole blocking/electron transporting layer in OLEDs [7]. [Pg.122]

ARUPS Angle-resolved ultraviolet photoelectron spectroscopy... [Pg.312]

ARUPS Angle-Resolved Ultraviolet Photoelectron Spectroscopy... [Pg.1087]

Acronyms ARUPS (angle resolved ultraviolet photoemission spectroscopy) ARPES (angle resolved photoelectron spectroscopy)... [Pg.506]

X-ray (XPS) [58-61] and ultraviolet photoelectron spectroscopy (UPS) [62-65] provide rich information about the valence bands of extended systems. The further development of angle-resolved UPS (ARUPS) can even be used to directly observe the band structures. Then they can provide a tool to directly check theory. [Pg.136]

ARUPS photoelectron spectroscopy Angle-resolved ultraviolet Yes5,41,232,324,325 No... [Pg.159]