Preresonance Raman spectra of simple amides using ultraviolet lasers

Investigation of vibrational and photolu

Investigation of vibrational and photoluminescence spectra of nanocrystalline silicon by micro-Raman spectroscopy using various laser powers

✍ Phan Hong Khoi; Ngo Thi Thanh Tam; Pham Hong Duong; Nguyen Xuan Nghia 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 96 KB 👁 1 views

The Raman spectra of silicon nanocrystals embedded in silicon oxide and in porous silicon were measured at various laser powers. It was found that the Si-Si stretching Raman peak shifts to lower wavenumbers and broadens when the laser power increases. The effect is significant and reversible, i.e. t