Bremsstrahlung Isochromat Study of Si(111) by 6.2 eV Photons |
| L. Sobczak, G.M. Guichar, R. Hamdache and C. Sebenne Laboratoire de Physique des Solides, Associé au CNRS 154, Université Pierre et Marie Curie, 75252 Paris, France |
| Received: March 19, 1991 |
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| We present the first experimental bremsstraldung isochromats at an extremal low photon energy of 6.2 eV measured by using a grating spectrometer placed in the air outside the ultra-high-vacuum chamber. Isochromats of the Si(111) cleaved surface have been measured for normal incidence of electrons. We have found that a free electron approximation for the initial electron state is quite good for the interpretation of bulk interband traηsitions occurring in the 6.2 eV isochromat of Si(111). A strong sensitivity for surface roughness of the 6.2 eV isochromat is observed. |
| DOI: 10.12693/APhysPolA.79.745 PACS numbers: 71.25.Rk, 73.20At |