Double-to-single ionization ratios of helium colliding with low-to-intermediate velocity charged ions

Shao, Jianxiong; Chen, X. M.; Bao-Wei, Ding

doi:10.1103/physreva.75.012701

Cited by 9 publications

(18 citation statements)

References 20 publications

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“…[6−16] In low velocity (v ≤ v Bohr ) ranges, the multiple ionization of target can be understood well by the classical over-barrier model (COBM), [17] and R is expected to be independent of the incident velocity v. For higher velocities (v ≥ 10 v Bohr ), the "shake-off" mechanism proposed by McGuire [10] shows that R was independent of the charge state q and the velocity v. The ratio R reached the maximum in a low-to-intermediate velocity range (v Bohr ≤ v ion ≤ 10 v Bohr ). The model [18] predicted that the maxima value of R appeared when the velocity was about 2-3 v Bhor , which is in agreement with experimental result. However, some obvious differences between theory prediction and the experimental data for partially stripped ions from the same charge state to the bare ions are unable to be explained by the model in Ref.…”

Section: Introductionsupporting

confidence: 89%

“…However, some obvious differences between theory prediction and the experimental data for partially stripped ions from the same charge state to the bare ions are unable to be explained by the model in Ref. [18] In the present work, the values of double-to-single ionization ratio R of helium atoms bombarded by 0.2-8.5 MeV C q+ , O q+ (q = 1 − 4) are measured. Based on the model in Ref.…”

Section: Introductionmentioning

confidence: 54%

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The direct ionization processes in the collisions of partially stripped carbon and oxygen ions with helium atoms at low-to-intermediate energies

et al. 2008

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The values of direct double-to-single ionization ratio R of helium atoms induced by Cq+, Oq++ (q = 1–4) ions at incident energies from 0.2 to 8.5MeV are measured. Based on the existing model (Shao J X, Chen X M and Ding B W 2007 Phys. Rev. A 75 012701) the effective charge of the projectile is introduced to theoretically estimate the value of R for the partially stripped ions impacting on helium atoms. The results calculated from our ‘effective charge’ model are in good agreement with the experimental data, and the dependence of the effective charge on the ionization energy of the projectile is also discussed qualitatively.

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Section: Introductionsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 54%

The direct ionization processes in the collisions of partially stripped carbon and oxygen ions with helium atoms at low-to-intermediate energies

et al. 2008

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“…With the projectile ion approaching the target atom, the stark energy of the projectile ion will transform into the kinetic energy of non-captured electrons. So these electrons will be ionized and escape from the target atom [9] . Under the framework of independent particle model, the probability of transfer ionization is TI SI…”

Section: Resultsmentioning

confidence: 99%

“…[9], the over-barrier probability of the electron multiplied by the over-barrier non-captured relative probability is SI . P The over-barrier probability is o p…”

Section: Resultsmentioning

confidence: 99%

Investigation of transfer ionization processes in the collision of partially stripped carbon ions on Argon

Wang

Chen

Bao-Wei

et al. 2008

Sci. China Ser. G-Phys. Mech. Astron.

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The ratios of the cross section of the transfer-ionization to the single-electroncapture of Argon induced by C q+ (q = 1, 2, 3) ions are measured by means of position sensitive and time-of-flight techniques. Our experimental results are compared with the data of He q+ (q = 1, 2) − Ar of DuBois. A qualitative interpretation is presented based on the Classical-Over-Barrier Model of Bohr.ion-atom collision, transfer-ionization, single-electron-capture, over barrier model Investigation of highly charged ions collision with atoms is one of the hot points in the field of atom/molecule, especially from the low to an intermediate energy range. We report measurements cross section of the transfer-ionization to the single-electron-capture ratios R, and the projectile energy varies from 0.2 MeV to 6.35 MeV. These investigations are needed in many applications like astrophysics, plasma physics and so on. The process of a projectile A q+ in collisions with an atom B can be expressed as:where the projectile ion A q+ finally captures k electron(s) and changes its charge state to ( ) A , q k − + which is called scattered projectile ion. The target atom B loses r electron(s) and becomes ionized; B r + is the recoil ion. Finally (r − k) electrons are emitted from the collision process. When (r − k) > 0, the reaction is called transfer-ionization (TI) process, and several different mechanisms can contribute to it. In this process, there are two main mechanisms: Shake-Off process and Two-Step process. When the projectile velocity is faster, and reaction time with target atoms is shorter, the probability of capture electron will be smaller. The main reaction channel is direct-single-ionization, and direct-two-ionization of target atoms works because of the Shake-Off process. When the projectile velocity becomes slow, the reaction time will increase, and two or more target atoms reacting with the projectile ion would be ionized, which is called Two-Step process [1,2] . In fact, these two

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“…Our ME-COBI model is based on COBI [22][23][24][25][26] and the over barrier (OB) models. [5] According to the capture model of OB, one electron can be released from the target atom when the Coulomb force is lower than the binding force of the electron in the atom.…”

Section: Theoretical Methodsmentioning

confidence: 99%

Multiple ionization of Ne induced by 10 keV/u–500 keV/u C ^{q

+} ( q = 1–3) ions

et al. 2015

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The values of cross-section ratio Rk1 of direct k-fold ionization cross section (σ k) to direct single ionization cross section (σ 1) of Ne impacted by Cq+ (q = 1–3) ions in an energy range of 10 keV/u–500 keV/u are measured in this work. The experimental data are compared with the results from our multi-electron classical over-barrier ionization (ME-COBI) model, showing that the model can give a good estimate to the experimental data.

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Double-to-single ionization ratios of helium colliding with low-to-intermediate velocity charged ions

Cited by 9 publications

References 20 publications

The direct ionization processes in the collisions of partially stripped carbon and oxygen ions with helium atoms at low-to-intermediate energies

The direct ionization processes in the collisions of partially stripped carbon and oxygen ions with helium atoms at low-to-intermediate energies

Investigation of transfer ionization processes in the collision of partially stripped carbon ions on Argon

Multiple ionization of Ne induced by 10 keV/u–500 keV/u C ^{q

+} ( q = 1–3) ions

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Double-to-single ionization ratios of helium colliding with low-to-intermediate velocity charged ions

Cited by 9 publications

References 20 publications

The direct ionization processes in the collisions of partially stripped carbon and oxygen ions with helium atoms at low-to-intermediate energies

The direct ionization processes in the collisions of partially stripped carbon and oxygen ions with helium atoms at low-to-intermediate energies

Investigation of transfer ionization processes in the collision of partially stripped carbon ions on Argon

Multiple ionization of Ne induced by 10 keV/u–500 keV/u C q + ( q = 1–3) ions

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Product

Resources

About

Multiple ionization of Ne induced by 10 keV/u–500 keV/u C ^{q

+} ( q = 1–3) ions