scholarly journals PIC SIMULATION OF THE ELECTRON-ION COLLISION EFFECTS ON SUPRATHERMAL ELECTRONS

2000 ◽  
Vol 49 (5) ◽  
pp. 915
Author(s):  
WU YAN-QING ◽  
HAN SHEN-SHENG
Keyword(s):  
Pic Simulation ◽  
Suprathermal Electrons ◽  
Ion Collision

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.

scholarly journals Some Anomalies in the Raman spectrum from laser-produced plasmas

1988 ◽  
Vol 6 (2) ◽  
pp. 287-294
Author(s):  
T. J. M. Boyd ◽  
G. A. Gardner ◽  
G. A. Coutts
Keyword(s):  
Raman Spectrum ◽  
Light Wave ◽  
Scattered Light ◽  
Thomson Scattering ◽  
Hot Electron ◽  
Conventional Theory ◽  
Suprathermal Electron ◽  
Suprathermal Electrons ◽  
Scattered Spectrum

Many experiments show features of the Raman spectrum at variance with the predictions of conventional theory. One persistent discrepancy, the cut-off in the spectrum of scattered light at about 1·5λ0, led Simon and Short to postulate that the scattered spectrum is not Raman light as such, but derives from enhanced Thomson scattering from plasmas in which a population of suprathermal electrons is present. We describe a set of simulations which model the propagation of a light wave through a plasma characterized by two electron temperatures with the hot electron fraction varying between 0 and 0·05. The results show that enhanced Thomson scattering will contribute to the spectra observed in some experiments at least and confirm the contention that the spectrum of the scattered light is not especially sensitive to the width of the suprathermal electron feature. We have also examined the effect of a finite quiver velocity on the enhanced Thomson spectrum as a function of the population of suprathermal electrons, in particular its effect on the wavelength bands.

Effects of temperature and electron collision frequency on the elastic electron–ion collisions in a collisional plasma

2013 ◽  
Vol 79 (5) ◽  
pp. 553-558 ◽  
Author(s):  
YOUNG-DAE JUNG ◽  
WOO-PYO HONG
Keyword(s):  
Phase Shift ◽  
Temperature Effect ◽  
Cross Section ◽  
Collision Frequency ◽  
Electron Collision ◽  
Elastic Electron ◽  
Dynamic Temperature ◽  
Electron Collision Frequency ◽  
Dynamic Screening ◽  
Ion Collision

AbstractThe effects of dynamic temperature and electron–electron collisions on the elastic electron–ion collision are investigated in a collisional plasma. The second-order eikonal analysis and the velocity-dependent screening length are employed to derive the eikonal phase shift and eikonal cross section as functions of collision energy, electron collision frequency, Debye length, impact parameter, and thermal energy. It is interesting to find out that the electron–electron collision effect would be vanished; however, the dynamic temperature effect is included in the first-order approximation. We have found that the dynamic temperature effect strongly enhances the eikonal phase shift as well as the eikonal cross section for electron–ion collision since the dynamic screening increases the effective shielding distance. In addition, the detailed characteristic behavior of the dynamic screening function is also discussed.

Collision geometry and particle production in high energy heavy ion collision experiments

2008 ◽  
Vol 32 (4) ◽  
pp. 308-328
Author(s):  
Wang Ya-Ping ◽  
Zhou Dai-Mei ◽  
Huang Rui-Dian ◽  
Cai Xu
Keyword(s):  
Particle Production ◽  
Heavy Ion ◽  
High Energy ◽  
Heavy Ion Collision ◽  
Ion Collision

scholarly journals Electron beam—plasma interaction in a dusty plasma with excess suprathermal electrons

2011 ◽  
Author(s):  
A. Danehkar ◽  
N. S. Saini ◽  
M. A. Hellberg ◽  
I. Kourakis ◽  
Vladimir Yu. Nosenko ◽  
...  
Keyword(s):  
Electron Beam ◽  
Dusty Plasma ◽  
Plasma Interaction ◽  
Suprathermal Electrons ◽  
Beam Plasma ◽  
Electron Beam Plasma
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