Observation of electronic energy bands in argon clusters

Abstract

The 3p valence region of argon clusters has been investigated with photoemission near the photoionization threshold. A strong feature between 14.6 and 15.3 eV binding energy shows a photon-energy dependence indicative of electronic-energy band dispersion. A similar feature at approximately the same binding energy and with a similar dispersion occurs in photoemission spectra of both the ordered and disordered solids. The effect is already fully developed for scaling-law mean cluster sizes ͗N͘ of approximately 200 atoms, thus showing an early onset of bulklike electronic properties.

Chemical shifts of small heterogeneous Ar/Xe clusters

“…In core-level spectra of rare-gas clusters, shifts toward lower binding energies can be largely explained through polarization screening of the final ionic state by the neighboring atoms. 29 In contrast, the valence spectra do not lend themselves to such an simple interpretation since formation of bands [30][31][32][33][34] complicates the picture. The atomic Ar 3p 3/2 and 3p 1/2 spinorbit components are indicated in the spectra.…”

The photoelectron angular distribution of water clusters

“…Meanwhile, at even lower photon energy than studied in those works, evidence for band formation in Ar clusters from the shape of valence photoelectron spectra has been presented. 18 β measurements of the rare gas clusters at higher kinetic energies are less straightforward in their interpretation. They should be affected much less by intracluster elastic scattering, as the respective cross sections have pronounced maxima at kinetic energies around 10 eV and drop by factors between 3 and 6 for an electron energy of 100 eV.…”

Interatomic Coulombic decay in mixed NeKr clusters

“…The spectrometer is a newly built magnetic bottle-type 40 electron energy analyser based on a design by Lablanquie, Eland et al 41 adapted to the situation at BESSY; it is an improved version of the instrument previously used for the investigation of ICD in H 2 O clusters. 5 This recently commissioned device has been described in detail by Mucke et al 42 and has been successfully used for photoelectron spectroscopy of Ar clusters 18,19 and of a fast beam of anions (OH − and O − ) produced by an optical laser. 43,44 In short, the experimental setup makes use of an inhomogeneous magnetic field to extract and parallelize the electrons emerging from the ionization processes and a homogeneous magnetic field to guide the electrons to a microchannel plate (MCP) detector.…”

“…Refs. [17][18][19], but are also easy to prepare. Our study on mixed rare gas clusters has two motivations: 1.…”