高温下正十五烷的拉曼光谱研究

文章在金刚石压腔下研究了正十五烷从室温到350℃的拉曼光谱特征.结果表明:随着温度的升高,体系压力也在不断增大;CH3,CH2对称和反对称伸缩振动同时受到温度和压力的影响,但2种作用相反.由于压力效应大于温度效应,随温度压力的增大CH3,CH2对称和反对称伸缩振动的拉曼位移均向高频方向移动,说明C-H键键能在增大.另外,由于新物质的生成导致过强荧光产生而无法测出正十五烷的拉曼光谱,而且过强荧光出现的时间早晚与温度和压力有一定的关系.

Raman Spectroscopic Studies of n-Pentadecane Under High Temperature

The present paper investigates the Raman spectrum of n-pentadecane in diamond anvil cell under a temperature up to 350 degrees C. The result shows that the pressure increases at elevated temperature, but the effect of pressure on the stretching vibrational modes of CH3 and CH2 is inverse to that of temperature. The action of temperature is weaker than that of pressure. So the spectral profile of stretching vibrational modes of CH3 and CH2 gradually changes and the Raman shift moves to higher frequency with increasing temperature and pressure. It is indicated that the bonding energy of C-H bonding increases with temperature and pressure. In addition, the generation of a new substance resulted in a drastic fluorescence appearance, so the detection of the Raman spectrum of n-pentadecane failed. During the authors' experiment, the author observed a dependence of the drastic fluorescence occurrence time on temperature and pressure conditions.