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Chinese Physics

Analysis of the low-lying spectrum of the He-tetramer

Bao Cheng-guang, Yan-zhang He, Li Xungui

Published Feb 20, 2002• 0 citations
Publisher

Abstract

There is a type of nodal surface imposed by symmetry on wavefunctions. These surfaces are crucial to the ordering of low-lying states. Based on an analysis of this type of surface and based on existing theoretical results, the feature of the low-lying spectrum of the He-tetramer is studied and the candidates of bound states and narrow resonances are suggested.

DOI
10.1088/1009-1963/11/3/310

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There is a type of nodal surface imposed by symmetry on wavefunctions. These surfaces are crucial to the ordering of low-lying states. Based on an analysis of this type of surface and based on existing theoretical results, the feature of the low-lying spectrum of the He-tetramer is studied and the candidates of bound states and narrow resonances are suggested.
The bound state spectrum of the low-lying triplet states in the Be atom is investigated. In particular, we perform accurate computations of the bound triplet SSS, PPP, DDD, FFF and GGG states in the four-electron Be atom. The results of these calculations are employed to draw the spectral diagram which contains the energy levels of the triplet states of Be atom. Based on our computational results we can observe transitions from the low-lying bound states to the weakly-bound, Rydberg states. For the 23S2^3S23S and 33S3^3S33S states in the Be atom we also determine a number of bound states properties and discuss the hyperfine structure by using our results of highly accurate computations.