Single electron capture by N12+ in rare gas targets between 60 keV and 200 keV

1979 ◽  
Vol 57 (12) ◽  
pp. 2078-2083
Author(s):  
B. Hird ◽  
H. C. Suk ◽  
S. P. Ali
Keyword(s):  
Cross Section ◽  
Weighted Average ◽  
Rare Gas ◽  
Rare Gases ◽  
Single Electron Capture ◽  
Correct Energy ◽  
Type Calculation ◽  
Gas Targets ◽  
Singly Charged ◽  
Charged Ions

Charge exchange measurements in thin targets of the rare gases by a N2+ beam have been made between 60 keV and 200 keV. The singly charged ions produced in the collisions are expected to be produced in only a few allowed states, and a Rapp and Francis type calculation for the weighted average cross section to these allowed states was found to have generally the correct energy dependence but to be too small by a factor which increased from 4 in He to more than 10 in Xe. There was some evidence that the 4P state of N2+ may have been present in the beam in varying amounts.

Electron loss cross sections from rare gas atoms to Ar+

1982 ◽  
Vol 60 (7) ◽  
pp. 977-980
Author(s):  
B. Hird ◽  
S. P. Ali
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Energy Region ◽  
Rare Gas ◽  
Electron Loss ◽  
Rare Gases ◽  
Thin Target ◽  
Rare Gas Atoms ◽  
Good Agreement

Measurements of the σ10 cross section for a beam of Ar+ ions of energies between 30 and 120 keV passing through a thin target of the rare gases show good agreement with the few previous measurements in this energy region.

Net ionisation cross sections of rare gas targets in collisions with swift highly charged ions

1993 ◽  
Vol 126 (1-4) ◽  
pp. 21-24 ◽  
Author(s):  
A. Cassimi ◽  
J. P. Grandin ◽  
L. H. Zhang ◽  
A. Gosselin ◽  
D. Hennecart ◽  
...  
Keyword(s):  
Cross Sections ◽  
Highly Charged Ions ◽  
Rare Gas ◽  
Gas Targets ◽  
Charged Ions

Single-electron capture by Cl2+(4S, 2D, 2P) from rare-gas targets

1988 ◽  
Vol 83 (3) ◽  
pp. 331-338 ◽  
Author(s):  
M. Hamdan ◽  
P. Jonathan ◽  
R.G. Kingston ◽  
A.G. Brenton
Keyword(s):  
Electron Capture ◽  
Single Electron ◽  
Rare Gas ◽  
Single Electron Capture ◽  
Gas Targets

Charge stripping and delayed autoionization in doubly charged ions of the noble gases

1985 ◽  
Vol 402 (1823) ◽  
pp. 373-400 ◽  
Keyword(s):  
Black Body ◽  
Black Body Radiation ◽  
Translational Energy ◽  
Rare Gases ◽  
Doubly Charged Ions ◽  
Free Process ◽  
Singly Charged ◽  
Double Focusing ◽  
Doubly Charged ◽  
Charged Ions

Doubly charged ions of each of the rare gases neon, argon, krypton and xenon, formed by electron impact and accelerated through 6 kV in a double-focusing mass spectrometer, are ionized to the corresponding triply charged ions via processes of at least two general kinds. The first proceeds under collision-free conditions, and can be attributed to delayed (microsecond) autoionization. An alternative explanation involving transitions from high Rydberg states, induced by the 350 K black-body radiation within the analyser vacuum housing, cannot be entirely ruled out. Other ionization processes require a collision with a molecule of collision gas, and result in a measurable loss of translational energy. In this paper the knowledge of analogous processes of the corresponding singly charged ions is reviewed, the general features of the translational energy spectra are established, and effort is devoted to the characterization of the collision-free process. The collision-induced processes have been interpreted in terms of known metastable states of the doubly charged ions.

Electron capture and loss by fast fluorine atoms in collisions with rare gas targets

1988 ◽  
Vol 66 (11) ◽  
pp. 972-977 ◽  
Author(s):  
B. Hird ◽  
F. Rahman ◽  
M. W. Orakzai
Keyword(s):  
Cross Sections ◽  
Rare Gas ◽  
Rare Gases ◽  
Single Atoms ◽  
Positive Ions ◽  
Electron Transfer Theory ◽  
The Cross ◽  
Fluorine Ions ◽  
Gas Targets ◽  
Pass Through

Cross sections are reported for the production of fast negative fluorine ions in collisions between a neutral fluorine beam and single atoms of each of the rare gases, at collision energies between 20 and 110 keV. The energies at which the cross sections pass through a maximum fit very well with the Massey criterion, assuming a simple electron-transfer theory. The cross sections for the production of fast fluorine positive ions are also reported. These are found to be smallest for the heavy targets and reach a maximum in helium and neon, which have higher ionization potentials than fluorine.

Electron transfer measurements from rare gas targets to O12+ ions between 60 and 200 keV

1980 ◽  
Vol 58 (6) ◽  
pp. 772-778 ◽  
Author(s):  
B. Hird ◽  
S. P. Ali
Keyword(s):  
Cross Sections ◽  
Spin Symmetry ◽  
Rare Gas ◽  
Final States ◽  
Rare Gases ◽  
Product Ions ◽  
The Cross ◽  
Gas Targets ◽  
Crossing Theory ◽  
Relative Weighting

Charge exchange measurements in thin targets of the rare gases by an O2+ beam have been made between 60 and 200 keV. Taking into account the relative weighting of the final states which are allowed assuming spin, symmetry, and Λ conservation it was found that a crossing theory of the Landau–Zener type is completely inadequate to account for the cross sections of the heavier targets, whereas a non-crossing theory in the Rapp–Francis formulation was found to give good fits, both in energy dependence and overall magnitude, to the cross sections except for the xenon target where it is too small by a factor of 2. The improvement in fit is due to the inclusion of a factor which was omitted in the original formulation of Rapp–Francis, and also the inclusion of many states of the product ions in the calculation.

Sign in / Sign up

Export Citation Format

Share Document