Abstract
Benchmark intensity ratio measurements of the energy loss lines of krypton for excitation of the 4p61S0→4p55s[3/2]2, 4p55s[3/2]1, 4p55s′[1/2]0, and 4p55s′[1/2]1 transitions are reported, these being the lowest electronic excitations for krypton. The importance of these ratios as stringent tests of theoretical electron scattering models for the noble gases is discussed, as well as the role of spin-exchange and direct processes regarding the angular dependence of these ratios. The experimental data are compared with predictions from fully-relativistic B-spline R-matrix (close-coupling) calculations.
Highlights
Ratios for Excitation of the 4p5sThe heavy rare gases are of great interest in both industry and collision physics
There is a wide array of applications involving the use of species such as krypton and xenon, with the most popular being that they act as excellent buffers in plasmas
A comprehensive theoretical study of electron scattering for the noble gases Ne, Ar, Kr, and Xe based on the semi-relativistic distorted-wave method was reported by Bartschat and Madison [5]
Summary
The heavy rare gases are of great interest in both industry and collision physics. There is a wide array of applications involving the use of species such as krypton and xenon, with the most popular being that they act as excellent buffers in plasmas. The general idea is the same, namely to extend the traditional low-energy close-coupling method to intermediate and even high energies by introducing so-called pseudo states These have the mathematical properties of bound states (most importantly, they are normalizable), but due to their confinement to either a hard (R-matrix) or soft (CCC with a Laguerre basis) box, they provide a discretization of the target continuum. The well-known R-matrix code of the Belfast group [20] has been extended to the RMPS framework, but applications to the heavy noble gases using the full power of the approach have been limited—likely due to the fact that the target description with strongly term-dependent one-electron valence orbitals remains a challenge, sufficiently large configuration interaction (CI) expansions should be able to solve this problem even if all one-electron orbitals are forced to be orthogonal to each other. Dr Zatsarinny in March 2021, the code with instructions is freely available on his GitHub site [24]
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