$K$ x rays produced in collisions of bare ions with atoms: Contribution of multiple-electron transfer in ${\mathrm{Kr}}^{36+}$, ${\mathrm{Ar}}^{18+}$, and ${\mathrm{Ne}}^{10+}+\mathrm{Ar}$ collisions

$K$ x rays produced in collisions of bare ions with atoms: Contribution of multiple-electron transfer in ${Kr}^{36 +}$ , ${Ar}^{18 +}$ , and ${Ne}^{10 +} + Ar$ collisions

Hiro Tawara, Endre Takács, Tibor Suta, Károly Makónyi, L. P. Ratliff, and J. D. Gillaspy

Phys. Rev. A 73, 012704 – Published 11 January 2006

Abstract

x rays have been observed in low energy collisions of bare Kr, Ar, and Ne ions with a neutral gas target. Although largely neglected previously, we have found that multiple-electron transfer processes play a significant role in shaping the x-ray spectra. The observed ratios of normal-satellite to hyper-satellite line intensities are found to be roughly independent of the ion species and much larger than those estimated from previously reported electron transfer cross sections, suggesting that there may be a strong correlation between two electrons during the electron transfer or during the subsequent cascades. It is suggested that exact knowledge of the initial and final principal and angular momentum quantum numbers in electron transfer are the most essential missing ingredients for understanding the entire x-ray emission process in astrophysical, laboratory, and technological plasmas.

Received 28 July 2005
Revised 5 October 2005

DOI:https://doi.org/10.1103/PhysRevA.73.012704

Authors & Affiliations

Hiro Tawara

National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8421, USA and Max Planck Institute for Nuclear Physics, D-69117 Heidelberg, Germany

Endre Takács, Tibor Suta, and Károly Makónyi

National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8421, USA and University of Debrecen, Experimental Physics Department, Debrecen, Bem ter 18/A, H-4028, Hungary

L. P. Ratliff and J. D. Gillaspy

National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8421, USA

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Vol. 73, Iss. 1 — January 2006

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Physical Review A

covering atomic, molecular, and optical physics and quantum information

$K$ x rays produced in collisions of bare ions with atoms: Contribution of multiple-electron transfer in ${Kr}^{36 +}$ , ${Ar}^{18 +}$ , and ${Ne}^{10 +} + Ar$ collisions

Hiro Tawara, Endre Takács, Tibor Suta, Károly Makónyi, L. P. Ratliff, and J. D. Gillaspy

Phys. Rev. A 73, 012704 – Published 11 January 2006

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Physical Review A

covering atomic, molecular, and optical physics and quantum information

K x rays produced in collisions of bare ions with atoms: Contribution of multiple-electron transfer in Kr36+, Ar18+, and Ne10++Ar collisions

Hiro Tawara, Endre Takács, Tibor Suta, Károly Makónyi, L. P. Ratliff, and J. D. Gillaspy

Phys. Rev. A 73, 012704 – Published 11 January 2006

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$K$ x rays produced in collisions of bare ions with atoms: Contribution of multiple-electron transfer in ${Kr}^{36 +}$ , ${Ar}^{18 +}$ , and ${Ne}^{10 +} + Ar$ collisions