Results 41 to 50 of about 4,890 (116)

Negative Ions of Polyatomic Molecules

Environmental Health Perspectives, 1980
In this paper general concepts relating to, and recent advances in, the study of negative ions of polyatomic molecules area discussed with emphasis on halocarbons. The topics dealt with in the paper are as follows: basic electron attachment processes, modes of electron capture by molecules, short-lived transient negative ions, dissociative electron ...
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Effect of Coulomb collision on the negative ion extraction mechanism in negative ion sources

Review of Scientific Instruments, 2015
To improve the H− ion beam optics, it is necessary to understand the energy relaxation process of surface produced H− ions in the extraction region of Cs seeded H− ion sources. Coulomb collisions of charged particles have been introduced to the 2D3V-PIC (two dimension in real space and three dimension in velocity space particle-in-cell) model for the H−
Goto I, Miyamoto K, Nishioka S, Mattei S, Lettry J, Abe S, Hatayama A   +6 more
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Neutralisation and transport of negative ion beams: physics and diagnostics

New Journal of Physics, 2017
Neutral beam injection is one of the most important methods of plasma heating in thermonuclear fusion experiments, allowing the attainment of fusion conditions as well as driving the plasma current.
G Serianni, P Agostinetti, M Agostini, V Antoni, D Aprile, C Baltador, M Barbisan, M Brombin, M Cavenago, G Chitarin, M Dalla Palma, R Delogu, F Fellin, N Fonnesu, N Marconato, R Pasqualotto, A Pimazzoni, E Sartori, S Spagnolo, M Spolaore, P Veltri, B Zaniol, M Zaupa   +22 more
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Phase-space characterization of negative ion beams for fusion

Nuclear Fusion
Multi-grid, multi-aperture accelerators are used in ion sources of neutral beam injectors (NBIs) for fusion. Accelerators are typically optimized by numerical tools, usually taking the e-fold divergence as a valuable global indicator of the single ...
Carlo Poggi, Antonio Pimazzoni, Emanuele Sartori, Gianluigi Serianni   +3 more
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negative ion

, 2014
Citation: 'negative ion' in the IUPAC Compendium of Chemical Terminology, 3rd ed.; International Union of Pure and Applied Chemistry; 2006. Online version 3.0.1, 2019. 10.1351/goldbook.N04098 • License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International for individual terms.
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Observation of a shape resonance of the positronium negative ion

Nature Communications, 2016
The Positronium negative ion is formed by two electrons bound to a positron, and experimental investigations of its states and energy levels are difficult due to its short lifetime.
Koji Michishio, Tsuneto Kanai, Susumu Kuma, Toshiyuki Azuma, Ken Wada, Izumi Mochizuki, Toshio Hyodo, Akira Yagishita, Yasuyuki Nagashima   +8 more
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Research on Negative Helium Ion Beam Generation Technology

Yuanzineng kexue jishu
Tandem accelerator can generate MeV-level positive ion beam, of which He ion beam can be used for experimental research and industrial applications such as ion beam analysis and ion implantation, which is an indispensable ion beam for tandem accelerator.
CHEN Haonan1, 2, CUI Baoqun1, 2, TANG Bing1, 2, CHEN Lihua1, 2, MA Ruigang1, 2, MA Yingjun1, 2, MA Xie1, 2, ZHANG Yifan1, 2, ZHAO Jiange1, 2, WANG Yunfeng1, 2, YANG Chao1, 2, YU Rongkai1, 2
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POSITIVE AND NEGATIVE ION MASS SPECTRA OF RING - SUBSTITUTED NITROBENZENES [PDF]

Journal of Sciences, Islamic Republic of Iran, 1993
The 70 ev positive and negative ion mass spectra of ring-substituted nitrobenzenes were studied. The influence of the substituent group on the fragmentation modes of the molecular ions is discussed.
doaj  

Production of negatively charged radioactive ion beams

New Journal of Physics, 2017
Beams of short-lived radioactive nuclei are needed for frontier experimental research in nuclear structure, reactions, and astrophysics. Negatively charged radioactive ion beams have unique advantages and allow for the use of a tandem accelerator for ...
Y Liu, D W Stracener, T Stora
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Probing chemical dynamics with negative ions [PDF]

The Journal of Chemical Physics, 2006
Experiments are reviewed in which key problems in chemical dynamics are probed by experiments based on photodetachment and/or photoexcitation of negative ions. Examples include transition state spectroscopy of biomolecular reactions, spectroscopy of open shell van der Waals complexes, photodissociation of free radicals, and time-resolved dynamics in ...
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