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Multi-photon and electron collisions

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One of the major outstanding problems in atomic physics is the accurate calculation of collision data for low ionization stages of iron peak elements such as iron, cobalt and nickel. This data is urgently required in the analysis of observations by the Hubble Space Telescope of gaseous nebulae and in the analysis of laboratory spectra from, for example, laser-plasma interactions and tokamaks.

It is now possible to include considerably more sophisticated wave functions to describe both the target and the collisional states than was previously possible. First calculations are showing detailed CI effects in electron collisions with atoms or atomic ions with an open 3d shell. This has revealed the need for extensive calculations to allow for correlation effects both in the target and in the collision system

 

 

The PRMAT codes scale well and are able to exploit the high-end computing resources available on HPCx. They have been applied successfully in LS coupling to study electron collisions with FeII, FeIII and FeIV, where comparison with previous work demonstrates the importance of including additional correlation effects and coupled channels and the need for using a sufficiently fine energy mesh. Typical results show complex resonance structures.

 

Configuration interaction effects in low-energy electron collisions with Fe II,
C A Ramsbottom, C J Noble, V M Burke, M P Scott & P G Burke,
J Phys B: At Mol Opt Phys 37 No 18 (28 September 2004) pp 3609-3631

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