Rmatrix approaches for electron and photondriven 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)
Rmatrix
methods have achieved much success in the areas of timedependent and
timeindependent computational atomic physics [1]. Originally
developed to describe nuclear resonances, Rmatrix theory has been
extensively applied to the treatment of atomic and molecular physics
problems since the late 1960s. Two of the more recently developed
Rmatrix approaches, and the focus of this seminar, are the
timeindependent Bspline atomic Rmatrix (BSR) [2] and the Rmatrix
with timedependence (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 Rmatrix 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 strongfield and perturbative regimes with argon atoms.
[1]
P. G. Burke, “Rmatrix
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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