Abstract
Abstract
The aim of the present theoretical work is the characterization of argonium, namely, the molecular ions
36
A
r
H
+
and
38
A
r
H
+
, revealed in the last decade in the Crab Nebula and the PKS 1823-211 galaxy. The intent is to scrutinize the radiative processes of association,
A
r
+
H
+
→
A
r
H
+
, and charge transfer,
A
r
+
+
H
→
A
r
+
H
+
. To accomplish these two tasks, the corresponding potential-energy curves and dipole moments are chosen to construct the ground and the two first excited
A
r
H
+
molecular states. Once all the required
A
r
H
+
curves are well established and their physical and spectroscopic values are contrasted with previous published data, the cross sections, for the formation of the ionic dimer
A
r
H
+
by radiative association and for the radiative charge transfer in the
A
r
+
+
H
collisions, are computed quantum-mechanically at lower and higher energies. Finally, the temperature-dependent rate coefficients are calculated, and the numerical results are discussed and fitted to a selected analytical expression.
Subject
Condensed Matter Physics,Atomic and Molecular Physics, and Optics