Motivation of concepts for the negative ion extraction from a single element of the matrix source

2016 ◽  
Vol 87 (2) ◽  
pp. 02B115 ◽  
Author(s):  
St. Lishev ◽  
A. Shivarova ◽  
D. Yordanov
Keyword(s):  
Negative Ion ◽  
Single Element ◽  
Ion Extraction ◽  
The Matrix

Negative ion extraction from hydrogen plasma bulk

2013 ◽  
Vol 20 (10) ◽  
pp. 103506 ◽  
Author(s):  
N. Oudini ◽  
F. Taccogna ◽  
P. Minelli ◽  
A. Aanesland ◽  
J.-L. Raimbault
Keyword(s):  
Hydrogen Plasma ◽  
Negative Ion ◽  
Ion Extraction ◽  
Plasma Bulk

scholarly journals Comparison of ONIX simulation results with experimental data from the BATMAN testbed for the study of negative ion extraction

2016 ◽  
Vol 56 (10) ◽  
pp. 106025 ◽  
Author(s):  
Serhiy Mochalskyy ◽  
Ursel Fantz ◽  
Dirk Wünderlich ◽  
Tiberiu Minea
Keyword(s):  
Experimental Data ◽  
Negative Ion ◽  
Ion Extraction ◽  
Simulation Results

SYNTHESIS OF ALLOY METAL NANOCLUSTERS IN SILICA GLASS BY SEQUENTIAL ION IMPLANTATION

2007 ◽  
Vol 06 (06) ◽  
pp. 423-430 ◽  
Author(s):  
B. JOSEPH ◽  
H. P. LENKA ◽  
P. K. KUIRI ◽  
D. P. MAHAPATRA ◽  
R. KESAVAMOORTHY
Keyword(s):  
Ion Implantation ◽  
Silica Glass ◽  
Metallic Nanoparticles ◽  
Rutherford Backscattering Spectrometry ◽  
Low Frequency ◽  
Peak Position ◽  
Negative Ion ◽  
Metal Nanoclusters ◽  
Cross Sectional ◽  
The Matrix

High fluence low energy negative ion implantation has been used to synthesize embedded metal nanoclusters of Au , Ag and Sb in silica glass. The Au - and Ag -implanted samples showed peaks, corresponding to surface plasmon resonance (SPR) in the optical absorption (OA) spectra, confirming the formation of metallic nanoparticles in the matrix. No SPR peak was observed in case of Sb -implanted samples which is attributed to the absence of pure metallic precipitates which could be detected in the OA spectrum. Low frequency Raman scattering (LFRS) measurements also confirm this. Cross-sectional transmission electron microscopy has been used to infer about the size distribution of the nanoparticles. Sequential implantations of Au and Ag or Au and Sb have been found to result in SPR peaks at locations in between those for nanoparticles of the constituent atoms, indicating the formation of alloy nanoparticles in the system. In case of the Au + Ag system, Rutherford backscattering spectrometry has been used to infer about the composition of the nanoparticles in terms of the concentrations of the metallic constituents. A direct, one-to-one correspondence between the SPR peak position and composition has been observed.

Enhancement of negative ion extraction and electron suppression by a magnetic field

1990 ◽  
Author(s):  
J. Bruneteau ◽  
R. Leroy ◽  
M. Bacal ◽  
J. H. Whealton
Keyword(s):  
Magnetic Field ◽  
Negative Ion ◽  
Ion Extraction

Electron-less negative ion extraction from ion-ion plasmas

2015 ◽  
Vol 106 (10) ◽  
pp. 104101 ◽  
Author(s):  
Dmytro Rafalskyi ◽  
Ane Aanesland
Keyword(s):  
Negative Ion ◽  
Ion Extraction

scholarly journals Comment on ‘Issues in the understanding of negative ion extraction for fusion’

2017 ◽  
Vol 26 (5) ◽  
pp. 058001 ◽  
Author(s):  
S Mochalskyy ◽  
T Minea ◽  
A Revel ◽  
I Montellano ◽  
D Wünderlich ◽  
...  
Keyword(s):  
Negative Ion ◽  
Ion Extraction

Fast Atom Bombardment Mass Spectra of Some N-α-(t-Butoxycarbonyl)-O-(diorganylphosphono)-L-serines and O-(Diorganylphosphono)seryl-Containing Dipeptides and Tripeptides

1994 ◽  
Vol 47 (2) ◽  
pp. 229 ◽  
Author(s):  
JW Perich ◽  
I Liepa ◽  
AL Chaffee ◽  
RB Johns
Keyword(s):  
Mass Spectrometry ◽  
Mass Spectrum ◽  
High Intensity ◽  
Mass Spectra ◽  
Fast Atom Bombardment ◽  
Molecular Ions ◽  
Operating Conditions ◽  
Negative Ion ◽  
The Matrix ◽  
Positive Ion

Positive and negative ion fast atom bombardment ( f.a.b .) mass spectrometry were found to be useful methods for the analysis and structural characterization of five Nα-(t- butoxycarbonyl )-O-( diorganylphosphono )-L- serines ( organyl = Ph, Et, Me, Bzl , But), especially in the case of the sensitive benzyl and t-butyl phosphono derivatives. Under positive ion operating conditions, high intensity pseudo-molecular ions were obtained in the f.a.b . mass spectra, and the fragmentation pathway of the phenyl, ethyl and methyl derivatives was established by parent/daughter linked scanning studies to involve (a) the two-step loss of the t- butoxycarbonyl group, (b) loss of the amino acid as the neutral fragment from the [MH]+, [MH-56]+, [MH-100]+ and [MH-146]+ ions by a four- centred β-elimination rearrangement, and (c) cleavage of the phosphono phenyl and ethyl groups from only the [(RO)2P(OH)2]+ and [NH=CHCH2PO3R2+H]+ fragments. Parent/daughter linked scanning studies of the benzyl derivative showed that the prominent fragmentation involved loss of the benzyl group as the tropylium ion and that the 'apparent' [MH-90]+ peak observed in its f.a.b. mass spectrum resulted from cleavage of the phosphono benzyl group in the matrix during the bombardment process. In the case of the t-butyl derivative, parent/daughter linked scanning studies showed that the prominent fragmentation involved successive 'in-flight' loss of the phosphono t-butyl groups as isobutene. Negative ion f.a.b. mass spectrometry of the five derivatives gave f.a.b. mass spectra which displayed distinct [M-H]- anions along with high intensity [M-H-R]- and [(RO)2PO2]- fragment anions, the f.a.b . mass spectrum of the t-butyl derivative containing an additional [M-H-But-But]- fragment anion. Parent/daughter linked scanning studies established that the majority of the observed fragment anions resulted from extensive fragmentation of the Boc -Ser(PO3R2)-OH derivatives in the matrix phase followed by sputtering of the resultant fragments into the gas phase. In addition, positive ion f.a.b . mass spectrometry was found to be useful for the analysis of a series of protected O-( diorganylphosphono ) seryl-containing dipeptides and tripeptides ( organyl = Ph, Et, Me, Bzl ). The obtained spectra showed that β-elimination fragmentation of the Ser(PO3R2) residue was more pronounced with the tripeptide series and indicated that there was increased sensitivity of the O-( diorganylphosphono ) seryl residue with replacement of the Boc group by an amino acyl residue at its N-terminus.

Issues in the understanding of negative ion extraction for fusion

2016 ◽  
Vol 25 (4) ◽  
pp. 045010 ◽  
Author(s):  
J P Boeuf ◽  
G Fubiani ◽  
L Garrigues
Keyword(s):  
Negative Ion ◽  
Ion Extraction
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