Absolute total and one- and two-electron transfer cross sections for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Ar</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">q</mml:mi><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>(8≤<i>q</i>≤16) on He and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">H</mml:mi></mml:mro

Vancura, J.; Marchetti, Vincent; Perotti, J. J.; Kostroun, V. O.

doi:10.1103/physreva.47.3758

Cited by 32 publications

(23 citation statements)

References 25 publications

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“…In the slow collisions of multiply charged ions with He gas, single-electron capture (SEC), true double-electron capture (TDC), and transfer ionization (TI) take place as inelastic reaction processes. Generally speaking, SEC can be regarded as the most dominant one as seen in collisions of Xe q+ (q = 10-43 ) and Ar q+ (q = 8-16) [21,22,23]. Therefore, we can assume that the observed emissions come from the ions in one less charge states than the incident ionic charge q+, i.e.…”

Section: Resultsmentioning

confidence: 99%

4d-4f unresolved transition arrays of xenon and tin ions in charge exchange collisions

Tanuma

Ohashi

Fujioka

et al. 2007

J. Phys.: Conf. Ser.

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Abstract. Extreme ultra-violet emission spectra of multiply charged Xe and Sn ions are measured following the electron capture in collisions with He. After the assumption of singleelectron capture, we have found that the wide range of charge states, Sn 10+ to Sn 14+ for tin ions, and Xe 11+ to Xe 17+ for xenon ions, have the prominent emissions at 13.5 and 11.0 nm, respectively. These emissions are attributed to the 4d-4f unresolved transition arrays in comparison with the results of theoretical calculations by using the HULLAC code.

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Section: Resultsmentioning

confidence: 99%

4d-4f unresolved transition arrays of xenon and tin ions in charge exchange collisions

Tanuma

Ohashi

Fujioka

et al. 2007

J. Phys.: Conf. Ser.

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“…In a previous paper [4] we reported on similar measurements of absolute total, oneand two-electron transfer cross sections for Arq+ on Hz and He. The present measurements were motivated by our investigations of multielectron transfer between low-energy, highly charged ions and medium-Z atomic and molecular targets.…”

Section: Introductionmentioning

confidence: 66%

“…[4) we obtained exact expressions for the evolution of the product charge-state distributions with gas target thickness when the projectile charge state q either remains the same or changes to q -1 or q -2. Since we were dealing with two-electron targets only, any observation of projectiles that had captured more than two electrons unambiguously signaled multiple-collision conditions and there was no reason to evaluate the rather complicated expressions further.…”

Section: Experimental Methodsmentioning

confidence: 99%

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Absolute total, one-, two-, and three-electron-transfer cross sections forArq+(8≤q≤16) on Ar at 2.3qkeV

et al. 1994

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Absolute values for the total, one-, two-, and three-electron-transfer cross sections for Ar + ions (8(q &16) colliding with argon at 2.3q keV laboratory energy were measured by the growth-rate method. The Arq+ ions were produced by the Cornell superconducting solenoid, cryogenic electronbeam ion source (CEBIS) and extracted at 2.3 kV. Selected charge states traversed a gas cell, after which they were detected and charge-state analyzed by the energy-retardation method and by a~/+2 cylindrical electrostatic analyzer. The target gas pressure in the cell was measured directly by the orifice Bow method used for absolute pressure-gauge calibration. The overall error in the Arq+ on Ar cross-section measurements is +10%.PACS number(s): 34.70.+e, 82.30.Fi, 82.20.Pm

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“…In slow collisions of multiply charged ions with He, single electron capture may be regarded as the dominant process with transfer ionisation making a significant contribution [5][6][7][8][9]. Therefore the final charge states in the production of Sn and Xe ions due to collisions of Sn q+ with He and Xe q+ with He are Sn (q-1)+ and Xe (q-1)+ respectively.…”

Section: Resultsmentioning

confidence: 99%

Configuration interaction in charge exchange spectra of tin and xenon

D’Arcy¹,

Morris²,

Ohashi³

et al. 2011

Phys. Scr.

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Abstract. Charge state specific extreme ultraviolet spectra from both tin ions and xenon ions have been recorded at Tokyo Metropolitan University. The Electron Cyclotron Resonance Source spectra were produced from charge exchange collisions between the ions and rare gas target atoms. In order to identify unknown spectral lines of tin and xenon, atomic structure calculations were performed for Sn 14+ -Sn 17+ and for Xe 16+ -Xe 20+ using the Hartree-Fock with Configuration Interaction code of Cowan. The energies of the capture states involved in the single electron process that occurs in these slow collisions are estimated using the classical over barrier model. IntroductionCharge state specific spectra from a range of tin and xenon ions have been recorded in the extreme ultraviolet (EUV) wavelength region at Tokyo Metropolitan University. The study was prompted by the importance of these species in source development for EUV lithography and metrology at the operating wavelength set by industry of 13.5nm [1]. In Sn, an intense unresolved transition array (UTA) resulting from 4p 6 4d n -4p 5 4d n+1 + 4p 6 4d n-1 4f transitions in Sn IX through Sn XIII emits at the desired wavelength [2,3]. However as the spectra from individual ion stages overlap in energy and plasma sources always contain a range of ion stages, unambiguous line identification is almost impossible in such regions of high line density. Thus ion separation techniques are an essential prerequisite to any analysis. In this work, we report on the EUV emission spectra of multiply charged Sn and Xe ions measured following electron capture in collisions with He.

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Absolute total and one- and two-electron transfer cross sections forArq+(8≤q≤16) on He andH

Cited by 32 publications

References 25 publications

4d-4f unresolved transition arrays of xenon and tin ions in charge exchange collisions

4d-4f unresolved transition arrays of xenon and tin ions in charge exchange collisions

Absolute total, one-, two-, and three-electron-transfer cross sections forArq+(8≤q≤16) on Ar at 2.3qkeV

Configuration interaction in charge exchange spectra of tin and xenon

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