Abstract
Vibrations at hydrogen- and deuterium-covered InP(110) surfaces were investigated by high-resolution electron energy-loss spectroscopy. With semi-insulating crystals, InH and PD bending modes were found at 438 and 465 cm −1 (54.3 and 57.7 meV), respectively. In the low-coverage regime two components of the PH stretching vibration at 2260 and 2300 cm −1 (280.2 and 285.4 meV) are resolved. They are explained by vibrational motions of mono- and dihydride groups. This indicates that InP(110) surfaces are disrupted even after small H exposures. Bond strengths are estimated from the isotope shifts of the stretching frequencies.
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