作　　者： ; ;

机构地区： 湖南师范大学

出　　处： 《原子能科学技术》 2002年第2期151-153,共3页

摘　　要： 应用格林函数理论 ,推导了简立方单原子纳米晶体颗粒的二次多普勒移动公式。数值计算结果表明 :在有限温度下 ,纳米晶体颗粒表面原子的二次多普勒移动比内部原子的小 ,纳米晶体颗粒内部各原子的二次多普勒移动近似相等。随着温度升高 ,表面原子的二次多普勒移动升高更快 ,在高温极限下 ,所有原子的二次多普勒移动相同 ;纳米晶体颗粒尺寸对表面和内部各原子的二次多普勒移动几乎无影响 ,但随纳米晶体颗粒尺寸的增加 。 The formula of the second order Doppler shift of simple cubic monatomic nanocrystalline particle is reduced by means of the Green's function. The numerical results show that when the temperature is finite, the second order Doppler shifts of atoms on the surface are smaller than those in the inner, the second order Doppler shifts of inner atoms are almost equal. It is also shown that the second order Doppler shifts of the atoms on surface increase more rapidly than those of atoms in the inner when temperature increases, at the high temperature limit, the second order Doppler shifts of all atoms are equal. The sizes of nanocrystalline particles almost do not affect the second order Doppler shifts of all atoms, but the second order Doppler shifts of the whole nanocrystalline particle increase when the size of nanocrystalline particle increases.

关 键 词： 单原子纳米晶体颗粒 二次多普勒移动 穆斯堡尔谱 格林函数

领　　域： [理学] [理学] [一般工业技术]