黔西南高砷煤中砷赋存状态的XAFS和铁的Mossbauer谱研究

利用X 射线吸收精细结构分析(XAFS) 和铁的穆斯堡尔谱(MÊssbauer) 对黔西南高砷煤中砷和铁的存在形式进行了研究。研究发现,高砷煤中的砷主要以高价砷的形式存在,也有少量以As2O3 、砷黄铁矿、砷硫化物的形式存在。除1 个样品中的铁全部以顺磁性针铁矿或超顺磁性的针铁矿的形式存在外,其它样品中的Fe 主要是黄铁矿中的Fe ,约占全铁的60 %～91 %;其次是黄铁钾矾中的Fe ,约占全铁的9 %～40 %。

Surface-enhanced Raman scattering of xanthopterin adsorbed on colloidal silver

Surface-enhanced Raman scattering (SERS) of xanthopterin adsorbed on colloidal silver was measured and the Raman spectrum calculated by the density functional theory method was also obtained. Xanthopterin can be detected down to 5 X 10(-9) m and the enhancement of the scattering intensity is at least 10(5)-fold. Xanthopterin molecules are adsorbed flatly on the surface of the Ag particles. This study shows that SERS could be another prospective method for the detection of pterines. Copyright (C) 2001 John Wiley Sons, Ltd.

Application of dynamical Lie algebraic method to atom-diatomic molecule scattering

The dynamical Lie algebraic approach developed by Alhassid and Levine combined with intermediate picture is applied to the study of translational-vibrational energy transfer in the collinear collision between an atom and an anharmonic oscillator. We find that the presence of the anharmonic terms indeed has an effect on the vibrational probabilities of the oscillator. The computed probabilities are in good agreement with those obtained using exact quantum method. It is shown that the approach of dynamical Lie algebra combining with intermediate picture is reasonable in the treating of atom-anharmonic oscillator scattering.