TITLE

Observation of Cu surface inhomogeneities by multiphoton photoemission spectromicroscopy

AUTHOR(S)
Cinchetti, M.; Oelsner, A.; Fecher, G.H.; Elmers, H.J.; Schönhense, G.
PUB. DATE
August 2003
SOURCE
Applied Physics Letters;8/25/2003, Vol. 83 Issue 8, p1503
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The spatially resolved energy distribution of electrons emitted from a polycrystalline copper surface has been studied by multiphoton photoemission. Electron emission was induced by femtosecond laser excitation and detected by an emission electron microscope combined with a time-of-flight detector to allow spatially resolved energy analysis. The energy distributions obtained from small spots with strongly enhanced electron emission yield (so-called hot spots) turned out to be different from those measured for homogeneous surface regions. The latter directly reflect two photon photoemission spectra from Cu as was previously observed in spatially averaging experiments. The hot spots, however, are characterized by a slightly lower work function and a strongly enhanced intensity if excited by s-polarized light. The peak positions of these spectra do not depend on the photon energy as is characteristic for a true secondary process. This indicates a different electron emission mechanism in the hot spots compared to homogeneous surfaces. © 2003 American Institute of Physics.
ACCESSION #
10603857

 

Related Articles

  • Polarization switching properties of spray deposited CsNO3: PVA composite films. Nautiyal, Arvind; Sekhar, K. C.; Pathak, N. P.; Dabra, Navneet; Hundal, Jasbir S.; Nath, R. // Applied Physics A: Materials Science & Processing;Jun2010, Vol. 99 Issue 4, p941 

    The ferroelectric and switching properties of spray deposited cesium nitrate: poly (vinyl alcohol) composite films at different substrate temperatures ( T s) have been studied. The optimum value of remanent polarization was obtained in the film deposited at T s=200°C, which may be due to...

  • Spin polarized photoemission from strained Ge epilayers. Bottegoni, Federico; Isella, Giovanni; Cecchi, Stefano; Ciccacci, Franco // Applied Physics Letters;6/13/2011, Vol. 98 Issue 24, p242107 

    We report on spin polarized electron photoemission experiments on compressively strained Ge/SiGe/Si(001) layers. Spin polarization of conduction band electrons up to P=62% at T=120 K has been observed, well above the theoretical limit of P=50% valid for bulk materials. Such spin polarization...

  • Electric field stimulation setup for photoemission electron microscopes. Buzzi, M.; Vaz, C. A. F.; Raabe, J.; Nolting, F. // Review of Scientific Instruments;Aug2015, Vol. 86 Issue 8, p1 

    Manipulating magnetisation by the application of an electric field in magnetoelectric multiferroics represents a timely issue due to the potential applications in low power electronics and the novel physics involved. Thanks to its element sensitivity and high spatial resolution, X-ray...

  • Interfacial electronic structure of copper phthalocyanine and copper hexadecafluorophthalocyanine studied by photoemission. Lau, K. M.; Tang, J. X.; Sun, H. Y.; Lee, C. S.; Lee, S. T.; Donghang Yan // Applied Physics Letters;4/24/2006, Vol. 88 Issue 17, p173513 

    Electronic structures of the heterojunction between copper phthalocyanine (CuPc) and copper hexadecafluorophthalocyanine (F16CuPc) were studied with ultraviolet photoemission spectroscopy. Band bending and an interface dipole were observed at the interface due to the formation of an electron...

  • Band offset determination of atomic-layer-deposited Al2O3 and HfO2 on InP by internal photoemission and spectroscopic ellipsometry. Xu, K.; Sio, H.; Kirillov, O. A.; Dong, L.; Xu, M.; Ye, P. D.; Gundlach, D.; Nguyen, N. V. // Journal of Applied Physics;Jan2013, Vol. 113 Issue 2, p024504 

    Band offsets at the interfaces of n- and p-type InP ((100) and (111)A) and atomic-layer-deposited (ALD) Al2O3 were measured with internal photoemission and spectroscopic ellipsometry. Similarly, the band offsets at the interface of semi-insulating InP (100) and ALD HfO2 were also determined. The...

  • Effect of nitrogen on band alignment in HfSiON gate dielectrics. Sayan, S.; Nguyen, N. V.; Ehrstein, J.; Chambers, J. J.; Visokay, M. R.; Quevedo-Lopez, M. A.; Colombo, L.; Yoder, D.; Levin, I.; Fischer, D. A.; Paunescu, M.; Celik, O.; Garfunkel, E. // Applied Physics Letters;11/21/2005, Vol. 87 Issue 21, p212905 

    Nitridation of HfSiO films improves certain physical and electrical properties—when using gate stack layers—such as their crystallization temperature and their resistance to interdiffusion. We have studied the band alignment of HfSiO and HfSiON films by soft x-ray photoemission,...

  • Measurements of threshold photoemission magnetic dichroism using ultraviolet lasers and a photoelastic modulator. Nakagawa, Takeshi; Yokoyama, Toshihiko; Hosaka, Masahito; Katoh, Masahiro // Review of Scientific Instruments;Feb2007, Vol. 78 Issue 2, p024702 

    A magneto-optical method based on valence band photoemission by laser excitation is described. Total photoexcited electron dichroism is detected using wave plates or a photoelastic modulator. Compared to the direct current method using wave plates, a modulation technique assisted by a...

  • Local correlation of photoemission electron microscopy and STM at a defined cluster substrate system. Rohmer, M.; Wiemann, C.; Munzinger, M.; Guo, L.; Aeschlimann, M.; Bauer, M. // Applied Physics A: Materials Science & Processing;Jan2006, Vol. 82 Issue 1, p87 

    We describe a technique that enables photoelectron spectroscopy and STM imaging of supported clusters from identical surface areas of a size of a few μm2 at a lateral resolution in the low nanometer regime. In this way we are able to locally correlate properties regarding the electronic...

  • Computational and experimental characterization of high-brightness beams for femtosecond electron imaging and spectroscopy. Portman, J.; Zhang, H.; Tao, Z.; Makino, K.; Berz, M.; Duxbury, P. M.; Ruan, C.-Y. // Applied Physics Letters;12/16/2013, Vol. 103 Issue 25, p253115 

    Using a multilevel fast multipole method, coupled with the shadow imaging of femtosecond photoelectron pulses for validation, we quantitatively elucidate the photocathode, space charge, and virtual cathode physics, which fundamentally limit the spatiotemporal and spectroscopic resolution and...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics