Ablated Mg films with a graphite cover as photocathodes
نویسندگان
چکیده
Mg films deposited by pulsed laser ablation on a Cu substrate were tested as photocathodes in a DC diode. They showed features of robustness and a quantum efficiency of 3 10 4 at low accelerating field when illuminated by 266 nm light at normal incidence. A graphite protective layer of about 20 nm thickness deposited by laser ablation just after the Mg deposition made the cathode stable and of easy handling. The cathodes could stay for several weeks in air before being inserted in the test chamber. The preparation procedure and the tests are presented. r 2005 Elsevier B.V. All rights reserved. PACS: 29.25.Bx; 79.60.Dp; 81.15.Fg
منابع مشابه
A Novel Method for Fabricating Wearable, Piezoresistive, and Pressure Sensors Based on Modified-Graphite/Polyurethane Composite Films
A wearable, low-cost, highly repeatable piezoresistive sensor was fabricated by the synthesis of modified-graphite and polyurethane (PU) composites and polydimethylsiloxane (PDMS). Graphite sheets functionalized by using a silane coupling agent (KH550) were distributed in PU/N,N-dimethylformamide (DMF) solution, which were then molded to modified-graphite/PU (MG/PU) composite films. Experimenta...
متن کاملStudies of the plume emission during the femtosecond and nanosecond ablation of graphite in nitrogen
Comparative studies of the pulsed laser ablation of graphite in 20 mTorr of N2 using both 15 ns and 450 fs pulses at a wavelength of 248 nm are reported. Emissions from the resulting ablation plumes, and from collisions with ablated material and the background N2 gas molecules, have been investigated by wavelength-, space-, and time-resolved optical emission spectroscopy OES , and the observati...
متن کاملCarbon Fluoride, CFx: Structural Diversity as Predicted by First Principles
Fluorinated carbon-based thin films offer a wide range of properties for many technological applications that depend on the microstructure of the films. To gain a better understanding on the role of fluorine in the structural formation of these films, CFx systems based on graphenelike fragments were studied by first principles calculations. Generally, the F concentration determines the type of ...
متن کاملPlasma enhanced chemical vapor deposition of deuterated diamond like carbon films for photocathode application
The influence of diamond like carbon films properties on quantum efficiency of prepared transmission photocathodes has been investigated. DLC films were deposited on silicon substrate and stainless steel mesh by PECVD using methane, argon and hydrogen or deuterium gas mixtures. Photocathodes prepared with deuterated DLC film have higher quantum efficiency than photocathodes prepared with hydrog...
متن کاملOn dewetting dynamics of solid films of hydrogen isotopes and its influence on tritium spectroscopy
The dewetting dynamics of solid films of hydrogen isotopes, quench-condensed on a graphite substrate, was measured at various temperatures below desorption by observing the stray light from the film. A schematic model describing the dewetting process by surface diffusion is presented, which agrees qualitatively with our data. The activation energies of different hydrogen isotopes for surface di...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2005