期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 7, 期 14, 页码 2697-2700出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/b507128c
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We demonstrate the mode-selective excitation of coherent phonons at Pt(111) surfaces covered with submonolayer caesium atoms. A burst of 150 fs laser pulses with the repetition rate of 2.0 - 2.9 THz was synthesized by using a spatial-light modulator, and used for the coherent surface phonon excitation. The coherent nuclear motion was monitored by time-resolved second harmonic generation. By tuning the repetition rate, we succeeded in controlling the relative amplitude of the vibrational coherence of the Cs - Pt stretching mode (2.3 - 2.4 THz) to that of the Pt surface Rayleigh phonon mode (2.6 or 2.9 THz, depending on the Cs coverage).
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