Adsorbate-localized versus substrate-mediated excitation mechanisms for generation of coherent Cs-Cu stretching vibration at Cu(111).
Adsorbate-localized versus substrate-mediated excitation mechanisms for generation of coherent Cs-Cu stretching vibration at Cu(111).
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吸附质局域与基质介导的激发机制在 Cu(111) 处产生相干 Cs-Cu 伸缩振动。
DOI:
10.1021/jp112307k
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发表时间:
2011
期刊:
影响因子:
--
通讯作者:
K. Nobusada
中科院分区:
文献类型:
--
作者:
Kazuya Watanabe;Y. Matsumoto;Tomokazu Yasuike;K. Nobusada
Coherent Cs-Cu stretching vibration at a Cu(111) surface covered with a full monolayer of Cs is observed by using time-resolved second harmonic generation spectroscopy, and its generation mechanisms and dynamics are simulated theoretically. While the irradiation with ultrafast pulses at both 400 and 800 nm generate the coherent Cs-Cu stretching vibration at a frequency of 1.8 THz (60 cm(-1)), they lead to two distinctively different features: the initial phase and the pump fluence dependence of the initial amplitude of coherent oscillation. At 400 nm excitation, the coherent oscillation is nearly cosine-like with respect to the pump pulse and the initial amplitude increases linearly with pump fluence. In contrast, at 800 nm excitation, the coherent oscillation is sine-like and the amplitude is saturated at high fluence. These features are successfully simulated by assuming that the coherent vibration is generated by two different electronic transitions: substrate d-band excitation at 400 nm and the quasi-resonant excitation between adsorbate-localized bands at 800 nm, i.e., possibly from an alkali-induced quantum well state to an unoccupied state originating in Cs 5d bands or the third image potential state.
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DOI:
--
发表时间:
2007
期刊:
Phys. Rev. B 76
影响因子:
--
作者:
M. Fuyuki;K. Watanabe;D. Ino;H. Petek;Y. Matsumoto
通讯作者:
Y. Matsumoto
影响因子:
3.7
作者:
D. M. Riffe;A. Sabbah
通讯作者:
D. M. Riffe;A. Sabbah
DOI:
--
发表时间:
2008
期刊:
影响因子:
--
作者:
K.Maeda;K.Teramura;N.Saito;Y.Inoue;K;Domen;M. Murase;今村真幸;今村真幸;今村真幸;今村真幸
通讯作者:
今村真幸
DOI:
--
发表时间:
2008
期刊:
影响因子:
--
作者:
Nojima;Yamashita
通讯作者:
Yamashita