R-matrix approaches for electron and photon-driven processes in atomic physics
Last updated October 7, 2020 by Alessandro Ferraro
Wednesday, September 23rd 2020, 04:00 PM, Microsoft Teams meeting
Speaker: Kathryn Hamilton (Drake University)
R-matrix
methods have achieved much success in the areas of time-dependent and
time-independent computational atomic physics [1]. Originally
developed to describe nuclear resonances, R-matrix theory has been
extensively applied to the treatment of atomic and molecular physics
problems since the late 1960s. Two of the more recently developed
R-matrix approaches, and the focus of this seminar, are the
time-independent B-spline atomic R-matrix (BSR) [2] and the R-matrix
with time-dependence (RMT) [3] methods.
BSR
and RMT both offer a fully multielectron treatment of their atomic
target; however, quite often the systems they are applied to can be
adequately described by accounting for the dynamics of only a single
active electron (SAE). In this seminar, I will first discuss their
computational implementation, including making the codes and examples
publicly available through the recently developed Atomic and
Molecular Physics Gateway [4]. Furthermore, I will present a
comparison of results from these sophisticated R-matrix methods and
related SAE approaches when applied to a variety of atomic physics
processes. Specifically, I will concentrate on a recent BSR study of
electron collisions with neutral indium [5] before discussing the
application of RMT to describe the interaction of short laser pulses
in both the strong-field and perturbative regimes with argon atoms.
[1]
P. G. Burke, “R-matrix
theory of atomic collisions: Application to atomic, molecular and
optical processes”,
Springer
(2011)
[2]
O. Zatsarinny and K. Bartschat, J.
Phys. B
46
112001 (2013)
[3]
A. C. Brown et
al.,
Comput.
Phys. Comm. 250
107062
(2020)
[4]
https://ampgateway.org
[5]
K. R. Hamilton et
al.,
Phys.
Rev. A 102
022801 (2020)
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