ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The generation of photoelectrons by an incident XeCl laser beam of 4.02 eV photon energy on three different targets, Y, Zn, and Ge, having work functions of 2.9, 3.9, and 4.8 eV, respectively, has been studied. Considering that the laser pulse has a trapezoidal evolution time and a rectangular spatial dependence, the evolution of the target temperature at the laser spot has been calculated. Using the computer code egun, the output current picked up by the collector resulted only of 44%, 42%, and 37% of the effective current for Y, Zn, and Ge, respectively, at 3 kV charging voltage. By utilizing the generalized Richardson equation which governs the generated current density, the dominant process existing during the laser-matter interaction has been determined. During the electron extraction, plasma was formed on the target surface particularly at high laser energies and high accelerating voltages. This plasma introduces an impedance into the cathode-anode region which shifts the Child–Langmuir law.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.357380
Permalink