کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9595060 | 1507973 | 2005 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Interpreting intensities in vibrational sum frequency generation (SFG) spectroscopy: CO adsorption on Pd surfaces
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
Sum frequency generation - تولید فرکانس SumChemisorption - جذب سطحی شیمیاییClusters - خوشهLow index single crystal surfaces - سطوح منفرد کریستال پایینVibrations of adsorbed molecules - لرزش مولکول های جذب شدهDensity functional calculations - محاسبات عملکردی تراکمcarbon monoxide - منوکسیدکربنPalladium - پالادیوم یا پالادیم
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
The lineshape and intensity of SFG signals of CO adsorbed on supported Pd nanoparticles and Pd(1Â 1Â 1) are analyzed. For CO/Pd(1Â 1Â 1) nearly symmetric lorentzian lineshapes were observed. Applying two different visible wavelengths for excitation, asymmetric lineshapes observed for the CO/Pd/Al2O3/NiAl(1Â 1Â 0) system are explained by a lower resonant and a higher non-resonant SFG signal and a change in the phase between resonant and non-resonant signals, most likely originating from an interband transition in the NiAl substrate. The relative intensity of different CO species (hollow, bridge, on-top) was modeled by DFT calculations of IR transition moments and Raman activities. While the (experimental) sensitivity of SFG towards different CO species strongly varies, the calculated IR and Raman activities are rather similar. The inability to exactly reproduce experimental SFG intensities suggests a strong coverage dependence of Raman activities or that non-linear effects occur that can currently not be properly accounted for.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface Science - Volume 586, Issues 1â3, 20 July 2005, Pages 146-156
Journal: Surface Science - Volume 586, Issues 1â3, 20 July 2005, Pages 146-156
نویسندگان
M. Morkel, H. Unterhalt, T. Klüner, G. Rupprechter, H.-J. Freund,