Electron pair emission from surfaces: Photon versus electron excitation
نویسندگان
چکیده
We have studied the electron pair emission process from a Cu(111) surface excited by primary or photon beam. Although energy was 30 eV beam had an of 25 eV. will discuss and momentum distributions. The experiments with demonstrate that contributions Shockley state can be clearly identified. This is not case for work photons which we ascribe to low spectral weight contribution two electrons compared $3d$ electrons. distributions reveal close similarity between types excitation despite fact microscopic origin very different. There distinctive dependence these curves describe empirical three-parameter polynomial. numerical values parameters are both pathways. Additional measurements different energies reveals importance initial on
منابع مشابه
Electron pair emission from a W(001) surface: photon versus electron excitation.
The electron pair emission from a W(001) surface was studied using a coincidence time-of-flight spectrometer. The aim of this study was to compare the pair emission upon electron impact and upon photon absorption. The energy distributions are markedly different for these two experiments. From this we conclude that the photon-stimulated pair emission carries a significant contribution from a dou...
متن کاملImaging electron emission from diamond and III–V nitride surfaces with photo-electron emission microscopy
Ž . Wide bandgap semiconductors such as diamond and the III–V nitrides GaN, AlN, and AlGaN alloys exhibit small or even negative electron affinities. Results have shown that different surface treatments will modify the electron affinity of Ž . diamond to cause a positive or negative electron affinity NEA . This study describes the characterization of these surfaces Ž . with photo-electron emiss...
متن کاملKinetic electron emission from Al surfaces by slow ions
M. Minniti,1 M. Commisso,1 A. Sindona,1 E. Sicilia,2 A. Bonanno,1 P. Barone,1 R. A. Baragiola,3 and P. Riccardi1,* 1Laboratorio IIS, Università della Calabria and INFN-Gruppo Collegato di Cosenza-87036 Rende, Cosenza, Italy 2Dipartimeto di Chimica, Università della Calabria-87036 Rende, Cosenza, Italy 3Laboratory for Atomic and Surface Physics, Department of Engineering Physics, University of V...
متن کاملVibrationally promoted electron emission from low work-function metal surfaces.
We observe electron emission when vibrationally excited NO molecules with vibrational state v, in the range of 9 < or = v < or =18, are scattered from a Cs-dosed Au surface. The quantum efficiency increases strongly with v, increasing up to 10(-2) electrons per NO (v) collision, a value several orders of magnitude larger than that observed in experiments with similar molecules in the ground vib...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical review
سال: 2021
ISSN: ['0556-2813', '1538-4497', '1089-490X']
DOI: https://doi.org/10.1103/physrevb.103.085435