Angular dependence of the photoelectron energy distribution of InP(100) and GaAs(100) negative electron affinity photocathodes

作者：Lee Dong Ick; Sun Yun^*; Liu Zhi; Sun Shiyu; Pianetta Piero

来源：Applied Physics Letters, 2007, 91(19): 192101.

DOI：10.1063/1.2805775

Energy distribution of the photoelectrons from InP(100) photocathodes are investigated with a photon energy range from 0.62 to 2.76 eV. When the photon energy is less than 1.8 eV, only electrons emitted from the Gamma valley are observed in the energy distribution curves. At higher photon energies, electrons from the L valley are observed. The angular dependence of the electron energy distributions of InP and GaAs photocathodes are studied and compared. The electrons emitted from the L valley have a larger angular spread than the ones from the Gamma valley due to the larger effective mass of the L valley minimum.

• 出版日期2007-11-5