Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1103/physreva.52.3959 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Decreased Secondary Electron Emission from Aluminum Surface by a Fluorocarbon-Titanium Composite Film.
ACS Omega
December 2024
Naval University of Engineering, Wuhan 430033, China.
Multipactor, a vacuum discharge under microwave conditions triggered by secondary electron emission (SEE), plays a critical role in managing the power level of microwave devices. In this study, we developed a fluorocarbon-titanium composite film on aluminum by cosputtering polytetrafluoroethylene (PTFE) and titanium via a controlled temperature and sputtering power ratio (RF power for PTFE to DC power for Ti) to suppress the SEE of Al. The evolution of microtopography and chemical composition of the composite film was evaluated.
View Article and Find Full Text PDFNew experimental methodology for determining the second crossover energy in insulators under stationary e-irradiation in a SEM.
Ultramicroscopy
January 2025
LaMaCoP, University of Sfax, Soukra Street Km 3, PO Box 1171, 3000 Sfax, Tunisia. Electronic address:
A new experimental methodology is proposed which uses the electrostatic influence method (EIM) in scanning electron microscope (SEM) in order to estimate the second crossover energy E for uncharged insulators. This experimental methodology based on simultaneous time measurement of the displacement and leakage currents, is approached to the short pulse irradiation technique but under stationary e-irradiation and allows determining the intrinsic secondary electron emission yield, σ (σ is the value of the total secondary electron yield just at the beginning of the irradiation before significant charge accumulation or before the formation of a surface potential). The obtained value of E for soda-lime glass is confirmed by two additional experiments based on secondary electron imaging.
View Article and Find Full Text PDFElectron surface scattering kernel for a plasma facing a semiconductor.
Phys Rev E
September 2024
Institut für Physik, Universität Greifswald, 17489 Greifswald, Germany.
Employing the invariant embedding principle for the electron backscattering function, we present a scheme for constructing an electron surface scattering kernel to be used in the boundary condition for the electron Boltzmann equation of a plasma facing a semiconducting solid. The scheme takes the solid's microphysics responsible for electron emission and backscattering from the interface within a randium-jellium model into account and is applicable to dielectrics and metals as well. As an illustration, we consider silicon and germanium, describing the interface potential by a Schottky barrier and including impact ionization across the energy gap as well as scattering on phonons and ion cores.
View Article and Find Full Text PDFDissociative ionization and post-ionization alignment of aligned O in an intense femtosecond laser field.
Phys Chem Chem Phys
October 2024
Department of Integrated Sciences, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan.
We examined dissociative ionization of O in an intense femtosecond laser field (782 nm, 120 fs, 4 × 10 W cm) by recording the kinetic energy distribution of O emitted along the laser polarization direction as a function of the delay time between the pump pulse (9 × 10 W cm) for the molecular alignment and the probe pulse for the dissociative ionization. We found the two distinct rotational revival patterns which are out-of-phase by π with each other in the kinetic energy distribution of O. One of the patterns shows the dissociative ionization is enhanced when the O axis is parallel to the laser polarization direction, suggesting that the ionization is induced by the electron emission from the 3σ orbital.
View Article and Find Full Text PDFUltra-Nonlinear Subcycle Photoemission of Few-Electron States from Sharp Gold Nanotapers.
Nano Lett
September 2024
Institut für Physik and Center for Nanoscale Dynamics (CeNaD), Carl von Ossietzky Universität Oldenburg, Carl-von-Ossietzky Str. 9-11, 26129 Oldenburg, Germany.
Article Synopsis
- The study focuses on generating ultrashort electron wavepackets for ultrafast electron microscopes, highlighting the importance of few-electron states in nonlinear photoemission processes.
- Researchers demonstrated extreme nonlinearities in electron emissions from gold nanotapers using few-cycle near-infrared pulses, achieving a single peak emission with subfemtosecond duration.
- By applying a bias voltage, they reduced recollisions in electron trajectories, leading to the creation of coherent subcycle electron beams that could enhance the resolution of ultrafast electron microscopy.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!