Open AccessNon–monotonic behaviour in the mean transverse energy of electrons emitted from a reflection–mode p-GaAs(Cs,O) photocathode during its QE degradation through oxygen exposure
Author(s) -
L. B. Jones,
H. E. Scheibler,
S. S. Kosolobov,
А. С. Терехов,
Boris Militsyn,
T. C. Q. Noakes
Publication year - 2021
Publication title -
journal of physics. d, applied physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.857
H-Index - 198
eISSN - 1361-6463
pISSN - 0022-3727
DOI - 10.1088/1361-6463/abe1e9
Subject(s) - photocathode , electron , photocurrent , materials science , range (aeronautics) , reflection (computer programming) , transverse plane , wavelength , atomic physics , analytical chemistry (journal) , optics , physics , optoelectronics , chemistry , nuclear physics , structural engineering , chromatography , computer science , engineering , composite material , programming language
We present a study on the evolution of both transverse and longitudinal energy distributions due to oxygen–induced quantum efficiency degradation in the electrons emitted from a reflection–mode p-GaAs(Cs,O)-photocathode over an effective electron affinity range of χ * ∼ −0.1 eV to χ * ∼ +0.3 eV under illumination wavelengths λ = 808, 635 and 532 nm. For λ = 635 and 532 nm, we found that the mean transverse energy of electrons emitted as the photocathode effective electron affinity increased has a non–monotonic character. Our proposed fitting model links the measured response to changes in the relative number of thermalised and non–thermalised electrons in the total emitted photocurrent.