Unexpected Charge-State Dependence of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>K</mi></math> X Rays Produced in Gaseous Targets by <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi mathvariant="normal">S</mi></mrow><mrow><mo>+</mo><mi>q</mi></mrow></msup></mrow></math> and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi mathvariant="normal">Ti</mi></mrow><mrow><mo>+</mo><mi>q</mi></mrow></msup></mrow></math> Ions

I. Tserruya; B. M. Johnson; K. W. Jones

doi:10.1103/PhysRevLett.45.894

Unexpected Charge-State Dependence of $K$ X Rays Produced in Gaseous Targets by $S^{+ q}$ and ${Ti}^{+ q}$ Ions

I. Tserruya, B. M. Johnson, and K. W. Jones

Phys. Rev. Lett. 45, 894 – Published 15 September 1980

Abstract

$K$ x rays produced in the bombardment of gas jet targets of helium, oxygen, and argon by sulfer and titanium beams have been measured for projectile charge states of +6 to +16 and +8 to +19, respectively. Unexpectedly, the charge-state dependence is similar for nearly symmetric systems and for very asymmetric systems. The results suggest that direct Coulomb excitation into empty bound states could be a common $K$ -shell-vacancy production mechanism.