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Doklady Physics

Orientation of a hydrogen atom excited by an electron impact near threshold

Alexander V. Demura, G. V. Demchenko, G. V. Sholin

Published Nov 1, 2004• 0 citations
Publisher
DOI
10.1134/1.1831525

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African Scientific Reports•Apr 14, 2026•0 citations
The density matrix describing excitation of the n=2 and n=3 levels of atomic hydrogen under proton impact is calculated, both in the first Born approximation and in a close-coupling expansion in target eigenstates. Various ways in which the properties of the excited state can be characterized in terms of certain linear combinations of density matrix elements are discussed. A new characterisation, based on an extrapolation below threshold of parameters describing the angular distribution of low-velocity ionised electrons, is suggested.
This study aimed to numerically investigate the impact of dipole-dipole interactions on the energy levels of a hydrogen atom, specifically the energy shift caused by the interaction of the atom's dipole moment with external electric fields. This research involved applying perturbation theory and numerical techniques to quantify the changes in energy levels due to dipole orientations and magnitudes, contributing to a deeper understanding of atomic behavior and its implications in various scientific disciplines. The results presented showed that the wavefunction of the hydrogen atom exhibits degeneracy, especially n=2, n=3 states. This implies that n=2, n=3, have different states but the same energy as a result of the subshells with angular momentum l, which contains 2l+1 distinct state corresponding to positive value of m (magnetic angular momentum quantum number) m=-l±1. The total degeneracy of the energy levels n is caused by n2. We find out that as the orientation of the electron charges (θ,ϕ) change the dipole moment also changes and thus has a perturbing effect on the energy levels of the hydrogen atom leading to a shift in its energy. This is confirmed, as the energy shift increases slightly from the ground state energy function Φ100 to the second exicted state Φ300, while the degeneracy state of Φ310 experiences infinitesimal energy shift above. This is because the probability of the electron been found in the lower energy level is greater than at higher energy level and so it is mostly affected there by energy shift. Also, the dipole moment could increase liberational energy of the atom and thus lead to more excitement even though its impact is quite negative. The outcome of this study could have implications in precision measurements, quantum computing, and the understanding of complex atomic systems.