短語詞組短語positron annihilation lifetime spectrum 正電子淹沒壽命譜positron annihilation life spectrum 正電子湮沒壽命譜positron annihilation lifetime spectrum pals 正電子湮沒壽命譜Positron annihilation spectrum 正電子譜spectrum annihilation 互燬﹝輻射﹞譜 返回 annihilation spectrum