Observation of surface mechanical excitons in crystals
Batyrev A. S., Novikov B. V., Cherednichenko A. E.
The exciton optical spectra have been measured in CdSe crystals with a natural surface and in crystals which had been subjected to electron bombardment. The exciton reflection spectra and exciton photoluminescence spectra at Τ = 4.2 К reveal a structure caused by a surface mechanical exciton {V. A. Kiselev, Fiz. Tverd. Tela (Leningrad) 20, 1191 (1978) [Sov. Phys. Solid State 20, 685 (1978)]].