Optically excited near-surface phonons of TiO2 (110) observed by fourth-order coherent Raman spectroscopy
Optically excited near-surface phonons of TiO2 (110) observed by fourth-order coherent Raman spectroscopy
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DOI：
10.1063/1.3207947
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发表时间：
2009-08-28
影响因子：
4.4
通讯作者：
Onishi, Hiroshi
中科院分区：
文献类型：
--
作者：
Nomoto, Tomonori;Sasahara, Akira;Onishi, Hiroshi
我们观察到了四阶和三阶光学响应的时间域上的TiO2（110）表面覆盖的三甲基乙酸酯。在四阶响应中，在179、191、359、440、507、609和823 cm（-1）处存在可归属于近表面声子模式的相干振动。利用泵浦光脉冲和探测光脉冲的不同方位角和偏振态，确定了每种模式的振幅和相位。振动分配和可能的机制，激发振动进行了讨论。
We observed the fourth-order and third-order optical responses in the time domain on a TiO2 (110) surface covered with trimethyl acetates. Coherent vibrations assignable to near-surface phonon modes were present at 179, 191, 359, 440, 507, 609, and 823 cm(-1) in the fourth-order responses. The amplitude and phase of each mode were determined with different azimuths and polarizations of pump and probe light pulses. Vibrational assignments and possible mechanisms to excite the vibrations were discussed.