scholarly journals SINGLE ELECTRON CAPTURE CROSS SECTION MEASURE MENT OF Ho+, Ce+ AND La+ IMPACT ON H2

1997 ◽  
Vol 46 (1) ◽  
pp. 56
Author(s):  
WANG ZHI-GANG ◽  
YAN BIN ◽  
GU JIAN ◽  
WU WEI-MIN ◽  
WU SONG-MAO ◽  
...  
Keyword(s):  
Electron Capture ◽  
Cross Section ◽  
Capture Cross Section ◽  
Single Electron ◽  
Capture Cross ◽  
Electron Capture Cross Section ◽  
Single Electron Capture

Collision dynamics of proton to water dimer at 250 eV

2019 ◽  
Vol 33 (22) ◽  
pp. 1950257
Author(s):  
Zhiping Wang ◽  
Fengshou Zhang ◽  
Xuefeng Xu ◽  
Yanbiao Wang ◽  
Chaoyi Qian
Keyword(s):  
Energy Loss ◽  
Electron Capture ◽  
Cross Section ◽  
Capture Cross Section ◽  
Water Dimer ◽  
Single Electron ◽  
Capture Cross ◽  
Electron Capture Cross Section ◽  
Total Electron ◽  
Single Electron Capture

Applying a real-space, real-time implementation of time-dependent density functional theory coupled to molecular dynamics (TDDFT-MD) non-adiabatically, we study the ionization and fragmentation of water dimer in collision with a proton at 250 eV. Four different incident orientations with various impact parameters are employed to account for orientation effects. The reaction channels, electronic density evolution, scattering pattern and energy loss of proton are obtained. We find that proton is scattered away for all impact parameters and the head-on collision effects the energy loss of proton dominantly as well as the scattering angle. The locations of peaks of the scattering angles are similar to those corresponding to the energy loss. The single-electron capture, the double-electron capture as well as the total electron capture cross-sections are obtained. We find that the single-electron capture cross-section contributes most to the total electron capture cross-section and the calculated total electron capture cross-section is in reasonable agreement with experimental and other theoretical results with respect to water gas and liquid water.

scholarly journals FAST NEGATIVE HYDROGEN IONS

1954 ◽  
Vol 32 (4) ◽  
pp. 275-290 ◽  
Author(s):  
A. Charles Whittier
Keyword(s):  
Electron Capture ◽  
Cross Section ◽  
Capture Cross Section ◽  
Hydrogen Gas ◽  
Negative Ion ◽  
Hydrogen Ions ◽  
Capture Cross ◽  
Electron Capture Cross Section ◽  
Magnetic Analysis ◽  
Equilibrium Ratio

A proton beam was directed through hydrogen gas at low pressure and magnetic analysis of the emergent beam showed that an appreciable fraction of the beam was transformed into negative hydrogen ions. After the beam had traversed a sufficient layer of gas, the ratio of negative hydrogen ions to protons reached an equilibrium value which was a maximum of 22.2% at 8.5 kev. The proton energy interval investigated extended from 4 to 70 kev.In this interval the electron loss cross section for negative hydrogen ions was measured and found to vary from 6.3 × 10−16 sq. cm. at 4.2 kev. to 2.5 × 10−10 sq. cm. at 70.3 kev. The electron capture cross section for protons in hydrogen was measured over the same interval and the results agreed substantially with those of other workers. The electron capture cross section for neutral atoms was also determined by combining present results for the negative ion loss cross section and for the equilibrium ratio of H− to H+ with the values of Bartels and of Montague and Ribe for the ratio of neutral atom loss cross section to the proton capture cross section.

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