کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5404143 | 1505932 | 2006 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Wave-packet oscillation in the excited state of KBr F centers
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Wave-packet oscillation in the excited state of KBr F centers Wave-packet oscillation in the excited state of KBr F centers](/preview/png/5404143.png)
چکیده انگلیسی
We investigated wave-packet oscillation of KBr F centers at 5Â K using up-conversion spectroscopy method. The Fourier power spectrum of the oscillatory signal shows that the predominant peaks are located at 2.6 and 4.8Â THz rather than at 3.3Â THz, which corresponds to the A1g breathing mode of the lattice around the vacancy. These modes are assigned to the LA phonons near the singularities in (1Â 0Â 0) and/or (1Â 1Â 0) crystal directions, and the LO phonons near the Î point, respectively. The result shows that in the excited state the local vibration around the center is described as the interaction mode consisting of a linear combination mainly of these bulk phonon modes, because the electron wavefunction in the excited state spatially spreads out. It is strongly suggested that the luminescence reflects solely the wave-packet motion in the excited state, while the degenerate pump and probe measurements probes mainly the ground state.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volumes 119â120, JulyâOctober 2006, Pages 43-46
Journal: Journal of Luminescence - Volumes 119â120, JulyâOctober 2006, Pages 43-46
نویسندگان
Takeshi Koyama, Youtarou Takahashi, Makoto Nakajima, Tohru Suemoto,