Aa body of matter物体、实物absolute temperature绝对温度absorb吸收absorption line spectrum吸收光谱acceleration加速度accuracy准确性、精密a changing electric field变化电场a changing magnetic field变化磁场a characteristic property特征性质actinide锕系元素a degree of freedom自由度a diffraction grating衍射光栅a double-slit interference pattern双缝干涉条纹a dual character双重特征a family of Bragg planes一组布拉格面a hollow object中空的物体allowed transition允许跃迁alpha particle阿尔法粒子alternating current交流电aluminum铝a magnetic field磁场amplitude振幅angular frequency角频率angular momentum角动量an odd number奇数anode阳极anomalous Zeeman effect反常塞曼效应