Projectile $K$ x rays from ${Si}^{12 +}$ ions in the $1 s 2 s {}^{3}S_{1}$ metastable state incident on helium gas

1 September 1977

journal article
research article
Published by American Physical Society (APS) in Physical Review A

Vol. 16 (3) , 1089-1092
https://doi.org/10.1103/physreva.16.1089

Abstract

The fractional population of

{Si}^{12 +}

ions in the

{}^{3}S_{1}

metastable state which is produced by the passage of 15-60-MeV Si ions through thin C and Au foils has been determined by measuring the x-ray yield from the spontaneous

M 1

decay of this state. This fraction (∼ 24% for the thickest C foils and highest bombarding energies) increases linearly with increasing Si energy and is highly dependent on the foil thickness and material. This information has been used to obtain absolute cross sections for Si

K

x-ray production in

{Si}^{12 +} (1 s 2 s {}^{3}S_{1}) \to He

collisions. From the results it is concluded that

K

x-ray emission predominantly occurs following

2 {}^{3}S_{1} \to 2 {}^{3}P_{1}

excitation at the higher energies (∼ 2 MeV/amu) and following outer-shell electron capture at the lower energies (∼ 0.5 MeV/amu).

Keywords

This publication has 10 references indexed in Scilit:

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ProjectileKx rays fromSi12+ions in the1s2sS13metastable state incident on helium gas

Abstract

Keywords

Projectile $K$ x rays from ${Si}^{12 +}$ ions in the $1 s 2 s {}^{3}S_{1}$ metastable state incident on helium gas