A Scaling Law for L-Shell X-Ray Production Cross Sections Induced by Impact of 4He+, 9Be2+, and 14N2+ Ions

Javier  Miranda

doi:10.15415/jnp.2016.41007

Authors

Javier Miranda Instituto de Física and Centro de Ciencias de la Atmósfera, Universidad Nacional Autónoma de México, Apartado Postal 20-364, 01000 México, Cd. Mx., MEXICO.

DOI:

https://doi.org/10.15415/jnp.2016.41007

Keywords:

X-rays, cross sections, heavy ion impact, PIXE

Abstract

Experimental results of L-subshell X-ray production cross sections induced by the impact of several ions heavier than protons were compiled in order to propose possible scaling laws. The ions of interest in this work are ⁴He⁺, ⁹Be²⁺, and ¹⁴N²⁺. A feasible universal scaling for the x-ray production cross sections of the L_α (L₃M₄ + L₃M₅) line is based on a reduced velocity parameter ξ^R_L1,2. In this scheme, the experimental data follow well resolved curves for each ion. A similar scaling for the L_γ line (L₂N₄ + L₁N₂ + L₁N₃+ L₁O₃ + L₁O₂ + L₂N₁ + L₂O₄) is also recommended, based on a different reduced velocity parameter ξ^R_L1,2. These results appear to be useful for all the studied projectile-target combinations covered in this work, supporting the idea that more theoretical studies in this direction should be done. However, the behavior of the fitting does not seem to follow the previously observed one.

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