Ve. Sivokon et al., PHONON-RIPPLON RESONANCES IN 2-DIMENSIONA L ELECTRON CRYSTAL OVER LIQUID-HELIUM, Fizika nizkih temperatur, 22(10), 1996, pp. 1107-1112
Electron-ripplon oscillations in Wigner crystal with charge density 1,
3 . 10(9) cm(-2) over liquid helium were cM studied in the temperature
range 70-600 mK at frequencies 1-20 MHz. Frequency and linewidths of
the resonances due to excitation of the phonon-ripplon modes are measu
red. The temperature dependence of resonant frequency is in a good agr
eement with the theoretical one.