B. K. Kardashev
Ioffe Physicotechnical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021 Russia
e-mail: B.Kardashev@pop.ioffe.rssi.ru
Received March 20, 2000
Abstract—An experimental study is reported of the effect of light on the acoustic characteristics of a HgI2 crys-
tal at two levels of the vibrational strain amplitude, one of which lies in the amplitude-independent (AI), and
the other in the amplitude-dependent (AD) ultrasound absorption (UA). These studies led to the spectral param-
eters of the photoacoustic effect (PAE) both for the decrement and for Young’s modulus of the HgI2 crystal. It
was shown that the PAE spectra of a sample exposed to high-amplitude ultrasound undergo, in some cases, sub-
stantial changes compared to those for low amplitudes (the AIUA region). These changes may be related both
to the diffusion of photosensitive dislocation-pinning centers (photocarrier trapping centers) and to their cre-
ation–annihilation induced by light and high amplitudes in the ADUA region. It is shown that the excitation of
electron–hole pairs captured by vacancies or iodine or mercury interstices can also noticeably affect the dislo-
cation mobility in HgI2. © 2000 MAIK “Nauka/Interperiodica”.
Pleiades Publishing home page | journal home page | top
If you have any problems with this server, contact webmaster.