scholarly journals Effective Charge Effect in 2·0 - 7·0 MeV Partially Stripped Fq+ -  Helium Collisions

1996 ◽  
Vol 49 (5) ◽  
pp. 945
Author(s):  
X Cai ◽  
ZY Liu ◽  
XM Chen ◽  
ZY Shen ◽  
XW Ma ◽  
...  
Keyword(s):  
Energy Range ◽  
Charge State ◽  
Cross Section ◽  
Effective Charge ◽  
Charge Effect ◽  
Ionisation Cross Section ◽  
Double Ionisation ◽  
Projectile Charge

The ratio of the double ionisation cross section to that of the single ionisation of helium was measured for 2�0–7�0 MeV Fq+ (q = 1,2,3,4) bombardment. The effective charge effect in partially stripped Fq+ – helium collisions is studied. It is found that the effective charge qeff increases as the impinging energy increases and that qeff shows almost no dependence upon the projectile charge state in the present energy range.

Measurements of the N2 2σu ou partial ionisation cross section via (e,2e) experiments

1999 ◽  
Vol 09 (PR6) ◽  
pp. Pr6-119-Pr6-122
Author(s):  
R. Flammin ◽  
E. Fainelli ◽  
L. Avaldi
Keyword(s):  
Cross Section ◽  
Ionisation Cross Section

scholarly journals Elastic Electron Scattering from Methane Molecule in the Energy Range from 50–300 eV

2021 ◽  
Vol 22 (2) ◽  
pp. 647
Author(s):  
Jelena Vukalović ◽  
Jelena B. Maljković ◽  
Karoly Tökési ◽  
Branko Predojević ◽  
Bratislav P. Marinković
Keyword(s):  
Energy Range ◽  
Cross Section ◽  
Cross Sections ◽  
Accurate Determination ◽  
Electron Gun ◽  
Methane Molecule ◽  
Edge Plasma ◽  
Electron Interaction ◽  
Outer Planet ◽  
Elastic Electron

Electron interaction with methane molecule and accurate determination of its elastic cross-section is a demanding task for both experimental and theoretical standpoints and relevant for our better understanding of the processes in Earth’s and Solar outer planet atmospheres, the greenhouse effect or in plasma physics applications like vapor deposition, complex plasma-wall interactions and edge plasma regions of Tokamak. Methane can serve as a test molecule for advancing novel electron-molecule collision theories. We present a combined experimental and theoretical study of the elastic electron differential cross-section from methane molecule, as well as integral and momentum transfer cross-sections in the intermediate energy range (50–300 eV). The experimental setup, based on a crossed beam technique, comprising of an electron gun, a single capillary gas needle and detection system with a channeltron is used in the measurements. The absolute values for cross-sections are obtained by relative-flow method, using argon as a reference. Theoretical results are acquired using two approximations: simple sum of individual atomic cross-sections and the other with molecular effect taken into the account.

Absolute photofission cross section of 209Bi in the energy range from 40 to 65 MeV

1980 ◽  
Vol 342 (1) ◽  
pp. 37-52 ◽  
Author(s):  
H.-D. Lemke ◽  
B. Ziegler ◽  
M. Mutterer ◽  
J.P. Theobald ◽  
N. Cârjan
Keyword(s):  
Energy Range ◽  
Cross Section

Differential cross-section measurements in positron–argon collisions

1996 ◽  
Vol 74 (7-8) ◽  
pp. 505-508 ◽  
Author(s):  
R. M. Finch ◽  
Á. Kövér ◽  
M. Charlton ◽  
G. Laricchia
Keyword(s):  
Elastic Scattering ◽  
Differential Cross Section ◽  
Inelastic Scattering ◽  
Energy Range ◽  
Cross Section ◽  
Cross Sections ◽  
Differential Cross ◽  
Coupling Effect ◽  
Channel Coupling ◽  
Scattering Cross

Differential cross sections for elastic scattering and ionization in positron–argon collisions as a function of energy (40–150 eV) are reported at 60°. Of particular interest is the energy range 55–60 eV, where earlier measurements by the Detroit group found a drop in the elastic-scattering cross section of a factor of 2. This structure has been tentatively attributed to a cross channel-coupling effect with an open inelastic-scattering channel, most likely ionization. Our results indicate that ionization remains an important channel over the same energy range and only begins to decrease at an energy above 60 eV.

scholarly journals Photoionization Cross Section of the NH2 Free Radical in the 11.1–15.7 eV Energy Range

2021 ◽  
Author(s):  
Oliver J. Harper ◽  
Bérenger Gans ◽  
Jean-Christophe Loison ◽  
Gustavo A. Garcia ◽  
Helgi R. Hrodmarsson ◽  
...  
Keyword(s):  
Free Radical ◽  
Energy Range ◽  
Cross Section ◽  
Photoionization Cross Section
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