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VOLUME 51 (1990) | ISSUE 3 | PAGE 145
Quantum oscillations caused by laser pulses in layered ε-GaSe
The oscillations with a period of 248 fs which have been observed (for the first time) in the optical transmission spectra of ^-GaSe subjected to laser pulses 60 fs long with an energy of 1.68 eV are explained under the assumption of a coherent excitation of A \ nonpolar optical phonons (134.6cm-1 ).