Photoconductivity and photoemission studies of diamond irradiated by ultrashort VUV pulses |
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| Authors: | J Gaudin G Geoffroy S Guizard G Petite SM Klimentov SV Garnov PA Pivovarov B Carré A Belsky P Martin |
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| Institution: | (1) Laboratoire des Solides Irradiés (CEA, CNRS, Ecole polytechnique), 91128 Palaiseau, France;(2) General Physics Institute, Russian Academy of Sciences, 119991 Moscow, Russia;(3) Service des Photons, Atomes et Molécules, CEA, Saclay, France;(4) CEntre Lasers Intenses et Applications, (Univ. Bordeaux 1, CEA, CNRS), 33405 Talence, France |
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| Abstract: | We investigated relaxation of free charge carriers in pure crystalline diamond exposed to VUV irradiation of high order harmonics of femtosecond Ti:Sa laser in the spectral range 17–32 eV. Electron–hole pairs, possessing a significant kinetic energy, are generated in the material via direct interband transitions, relaxation of which is monitored by means of induced conductivity in the bulk and photoemission from the surface of the material. The experimental data provided by these complementary techniques are compared and discussed in terms of the competition between ionization and conductivity looking for evidences of multiplication of free charge carriers due to impact ionization. PACS 42.65.Re; 72.20.Jv; 72.40.+w; 79.60.-i |
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