Electron molecule cross sections relevant to negative ion sources and divertor plasmas

1996 ◽  
Author(s):  
R. Celiberto ◽  
M. Capitelli ◽  
U. T. Lamanna ◽  
R. K. Janev
Keyword(s):  
Cross Sections ◽  
Ion Sources ◽  
Negative Ion

scholarly journals Identification of N-glycans with GalNAc-containing antennae from recombinant HIV trimers by ion mobility and negative ion fragmentation

2021 ◽  
Author(s):  
David J. Harvey ◽  
Anna-Janina Behrens ◽  
Max Crispin ◽  
Weston B. Struwe
Keyword(s):  
Cross Sections ◽  
Ion Mobility ◽  
Travelling Wave ◽  
Negative Ion ◽  
Ion Fragmentation ◽  
Structural Identity ◽  
Immunodeficiency Virus ◽  
Different Types ◽  
Complex Glycans ◽  
Ion Collision

AbstractNegative ion collision-induced dissociation (CID) of underivatized N-glycans has proved to be a simple, yet powerful method for their structural determination. Recently, we have identified a series of such structures with GalNAc rather than the more common galactose capping the antennae of hybrid and complex glycans. As part of a series of publications describing the negative ion fragmentation of different types of N-glycan, this paper describes their CID spectra and estimated nitrogen cross sections recorded by travelling wave ion mobility mass spectrometry (TWIMS). Most of the glycans were derived from the recombinant glycoproteins gp120 and gp41 from the human immunodeficiency virus (HIV), recombinantly derived from human embryonic kidney (HEK 293T) cells. Twenty-six GalNAc-capped hybrid and complex N-glycans were identified by a combination of TWIMS, negative ion CID, and exoglycosidase digestions. They were present as the neutral glycans and their sulfated and α2→3-linked sialylated analogues. Overall, negative ion fragmentation of glycans generates fingerprints that reveal their structural identity.

High voltage holding in the negative ion sources with cesium deposition

2016 ◽  
Vol 87 (2) ◽  
pp. 02B120 ◽  
Author(s):  
Yu. Belchenko ◽  
G. Abdrashitov ◽  
A. Ivanov ◽  
A. Sanin ◽  
O. Sotnikov
Keyword(s):  
High Voltage ◽  
Ion Sources ◽  
Negative Ion

scholarly journals Fullerene Negative Ions: Formation and Catalysis

2020 ◽  
Author(s):  
Zineb Felfli ◽  
Kelvin Suggs ◽  
Nantambu Nicholas ◽  
Alfred Z. Msezane
Keyword(s):  
Transition State ◽  
Cross Sections ◽  
Water Oxidation ◽  
Regge Pole ◽  
Negative Ions ◽  
Negative Ion ◽  
Total Cross Sections ◽  
Hydrogen Bond Strength ◽  
Low Energy Electron ◽  
Fundamental Mechanism

We first explore negative-ion formation in fullerenes C44, C60, C70, C98, C112, C120, C132 and C136 through low-energy electron elastic scattering total cross sections calculations using our Regge-pole methodology. Water oxidation to peroxide and water synthesis from H2 and O2 are then investigated using the anionic catalysts C44ˉ to C136ˉ. The fundamental mechanism underlying negative-ion catalysis involves hydrogen bond strength-weakening in the transition state. DFT transition state calculations found C60ˉ numerically stable for both water and peroxide synthesis, C100ˉ increases the energy barrier the most and C136ˉ the most effective catalyst in both water synthesis and oxidation to H2O2.

H− production from non-cesiated converter-type negative ion sources

1990 ◽  
Author(s):  
C. F. A. van Os ◽  
K. N. Leung ◽  
A. F. Lietzke ◽  
J. W. Stearns ◽  
W. B. Kunkel
Keyword(s):  
Ion Sources ◽  
Negative Ion

scholarly journals A review of negative ion sources

1977 ◽  
Vol 12 (10) ◽  
pp. 1435-1444 ◽  
Author(s):  
R. Middleton
Keyword(s):  
Ion Sources ◽  
Negative Ion

scholarly journals Extraction induced emittance growth for negative ion sources

1990 ◽  
Author(s):  
J. H. Whealton ◽  
P. S. Meszeros ◽  
R. J. Raridon ◽  
K. E. Rothe
Keyword(s):  
Ion Sources ◽  
Negative Ion ◽  
Emittance Growth
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