功函数(work function) 定义为使电子脱离固体进入周围空间(真空)所必须给与电子的最低能量,有时也称为逸出功.它是表征固体表面宏观性质的重要物理量之一,一般随温度缓变,但随表面状况(如表面清洁度、晶向、结构、反应、化学组成、电荷转移等)变化灵敏,变化幅度一般从几十到几 A work function is defined as the lowest energy that electrons must electronically donate to enter the surrounding space (vacuum), sometimes called work function, and is one of the important physical quantities that characterize the macroscopic properties of a solid surface, Temperature changes, but with the surface conditions (such as surface cleanliness, crystal orientation, structure, reaction, chemical composition, charge transfer, etc.) sensitive changes in the general range from tens to several