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在热电子发射的研究中,常要量测发射体的有效逸出功.众所周知,一定温度下发射体的发射电流密度决定于李查逊公式: j=AT~2exp(-φ/kT); 其中j是发射电流密度(安/厘米~2),T是发射体温度(°K),k是玻尔兹曼常数(k=11600度/电子伏),A为发射常数,φ为逸出功. 如果在一定温度T时,测得发射密度j,就可从公式中求出φ,这样决定的φ称为有效逸出功(公式中A取理论值120安/厘米~2·度~2).研究有效逸出功可进一步了解发射体的性质.
In the study of hot electron emission, it is often necessary to measure the effective work function of the emitter.It is well known that the emitter current density at a certain temperature depends on the Richardson formula: j = AT ~ 2exp (-φ / kT); Where j is the emission current density (A / cm 2), T is the emitter temperature (° K), k is the Boltzmann constant (k = 11600 ° / eV), A is the emission constant and φ is the escape Work.If at a certain temperature T, the measured emission density j, can be obtained from the formula φ, so the decision φ is called the effective work (A theoretical value of 120 A / cm ~ 2 degrees ~ 2). Study the effective work function to further understand the nature of the emitter.