Modified Atomic Orbital Calculations of Energy of the (2&lt;i&gt;s&lt;/i&gt;&lt;sup&gt;2&lt;/sup&gt; &lt;sup&gt;1&lt;/sup&gt;&lt;i&gt;S&lt;/i&gt;) Ground-State, the (2&lt;i&gt;p&lt;/i&gt;&lt;sup&gt;2&lt;/sup&gt; &lt;sup&gt;1&lt;/sup&gt;&lt;i&gt;D&lt;/i&gt;); (3&lt;i&gt;d&lt;/i&gt;&lt;sup&gt;2&lt;/sup&gt; &lt;sup&gt;1&lt;/sup&gt;&lt;i&gt;D&lt;/i&gt;) and (4&lt;i&gt;f&lt;/i&gt;&lt;sup&gt;2&lt;/sup&gt; &lt;sup&gt;1&lt;/sup&gt;&lt;i&gt;I&lt;/i&gt;) Doubly Excited States of Helium Isoelectronic Sequence from H&lt;sup&gt;-&lt;/sup&gt; to Ca&lt;sup&gt;18+&lt;/sup&gt;

We report in this paper the total energies of the 2p2 1D, 3d2 1G, 4f2 1I doubly excited states of Helium isoelectronic sequence with nuclear charge Z ≤ 20. Calculations are performed using the Modified Atomic Orbital Theory (MAOT) [1;2] in the framework of a variational procedure. The purpose of this study required a mathematical development of the Hamiltonian applied to Slater-type wave function [3] combining with Hylleraas-type wave function [4]. The study leads to analytical expressions which are carried out under special MAXIMA computational program. This proposed MAOT variational procedure, leads to accurate results in good agreement as well as with available other theoretical results than experimental data. In the present work, a new correlated wave function is presented to express analytically the total energies for each 2p2 1D, 3d2 1G, 4f 2 1I Doubly Excited States (DES) in the He-like systems. The present accurate data may be a useful guideline for future experimental and theoretical studies in the (nl2 ) systems.

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Resonance energies and autoionization widths of the , and doubly excited states of the helium isoelectronic sequence

Physics Letters A ◽

10.1016/j.physleta.2010.09.021 ◽

2010 ◽

Vol 374 (44) ◽

pp. 4512-4516 ◽

Cited By ~ 2

Author(s):

Spyros I. Themelis

Keyword(s):

Excited States ◽

Isoelectronic Sequence ◽

Doubly Excited States ◽

Resonance Energies ◽

Doubly Excited

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Photoionization of KCs Molecule: Origin of the Structured Continuum?

Atoms ◽

10.3390/atoms8020024 ◽

2020 ◽

Vol 8 (2) ◽

pp. 24 ◽

Cited By ~ 2

Author(s):

Goran Pichler ◽

Robert Beuc ◽

Jahja Kokaj ◽

David Sarkisyan ◽

Nimmy Jose ◽

...

Keyword(s):

Excited States ◽

Ground State ◽

Spectral Region ◽

Alternative Explanation ◽

Molecular State ◽

Doubly Excited States ◽

Doubly Excited ◽

Ultraviolet Spectral Region ◽

Deep Ultraviolet ◽

Potential Curves

We report the experimental observation of photoionization bands of the KCs molecule in the deep ultraviolet spectral region between 200 and 420 nm. We discuss the origin of observed photoionization bands as stemming from the absorption from the ground state of the KCs molecule to the excited states of KCs+ molecule for which we used existing potential curves of the KCs+ molecule. An alternative explanation relies on the absorption from the ground state of the KCs molecule to the doubly excited states of the KCs** molecule, situated above the lowest molecular state of KCs+. The relevant potential curves of KCs** are not known yet, but all those KCs** potential curves are certainly autoionizing. However, these two photoionization pathways may interfere resulting in a special interference structured continuum, which is observed as complex bands.

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