Features of Resonant Raman Scattering in Superhard Amorphous Carbon

IF 1.4 4区 物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY
M. Yu. Popov, F. S. Khorobrykh, S. A. Klimin, D. A. Ovsyannikov
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引用次数: 0

Abstract

The resonant Raman scattering phenomena in carbon nanoclusters formed by sp3 bonds have been investigated. Such structures have been synthesized from fullerite С60 at pressures of 20–25 GPa at room temperature and under heating to 1400 K. Two types of Raman resonance are observed. The first type is associated with the resonant enhancement of the Raman spectra near the absorption edge and has been observed for the prepared samples under laser excitation at wavelengths of 1064 and 532 nm. In such spectra, high-frequency sp3 modes of all nanoclusters from 1388 to 1640 cm–1 are observed. The second type of resonance manifests itself in the activation of one of the modes in the range of 1388–1640 cm–1 of the Raman spectrum, depending on the exciting-radiation wavelength. The frequency of the active mode is a linear function of the exciting-radiation wavelength. The piezospectroscopy method has been used to show that under the excitation with a shorter wavelength, clusters with a larger bulk compression modulus are involved in the Raman scattering processes.

Abstract Image

超硬非晶碳的共振拉曼散射特性
研究了碳纳米团簇中由sp3键形成的共振拉曼散射现象。这种结构是由富勒石С60在20-25 GPa的室温压力下和加热到1400 K下合成的。观察到两种类型的拉曼共振。在1064 nm和532 nm激光激发下,制备的样品在吸收边缘附近的拉曼光谱发生共振增强。在1388 ~ 1640 cm-1范围内观察到所有纳米团簇的高频sp3模式。第二种共振表现为喇曼光谱1388-1640 cm-1范围内的一种模式的激活,这取决于激发辐射的波长。主动模式的频率是激发辐射波长的线性函数。利用压电光谱分析方法表明,在波长较短的激发下,具有较大体积压缩模量的团簇参与了拉曼散射过程。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
JETP Letters
JETP Letters 物理-物理:综合
CiteScore
2.40
自引率
30.80%
发文量
164
审稿时长
3-6 weeks
期刊介绍: All topics of experimental and theoretical physics including gravitation, field theory, elementary particles and nuclei, plasma, nonlinear phenomena, condensed matter, superconductivity, superfluidity, lasers, and surfaces.
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