Eberhardt E H
Appl Opt. 1977 Aug 1;16(8):2127-33. doi: 10.1364/AO.16.002127.
Experimental measurements of the lateral (i.e., radial) spreading of photoelectrons from a multialkali photocathode in an unfocused image dissector tube have shown that (a) the distribution of the radial emission energies is approximately Maxwellian and (b) the radial emission energies are smaller than expected based on the difference between the input photon energies and the long wavelength threshold energy of the multialkali photocathode ( congruent with1.4 eV). Both results are favorable with respect to the predicted electron optical image transfer properties of proximity focused image tubes. The observed data indicate that at least a 40-lp/mm or a 1600-lp/40-mm image field diameter should be resolvable for white light input to commercially available tubes-and that this resolving power should increase to at least 60 lp/mm for input wavelengths longer than approximately 600 nm and decrease to 30 lp/mm or less for input wavelengths shorter than approximately 400 nm.
对非聚焦析像管中多碱光电阴极发射的光电子横向（即径向）扩展进行的实验测量表明：（a）径向发射能量的分布近似为麦克斯韦分布；（b）径向发射能量小于基于输入光子能量与多碱光电阴极长波长阈值能量之差（约为1.4 eV）所预期的值。这两个结果都有利于接近聚焦像管预测的电子光学图像传递特性。观测数据表明，对于输入白光的市售像管，至少40线对/毫米或1600线对/40毫米的像场直径应该是可分辨的，并且对于波长大于约600 nm的输入光，这种分辨能力应至少增加到60线对/毫米，而对于波长小于约400 nm的输入光，分辨能力应降低到30线对/毫米或更低。
