Spectral data for doubly excited states of helium with non-zero total angular momentum

TL;DR

This paper employs a spectral method to calculate energies, widths, and angular correlations of helium's doubly excited resonance states with various angular momenta, up to near the ionization threshold.

Contribution

It provides comprehensive spectral data for helium's doubly excited states with non-zero angular momentum, including energies, widths, and angular expectation values, extending previous studies.

Findings

Calculated energies and widths for helium resonance states with L=1 to 4.

Data includes states up to below the 5th ionization threshold.

Provides expectation values of angular correlations for these states.

Abstract

A spectral approach is used to evaluate energies and widths for a wide range of singlet and triplet resonance states of helium. Data for total angular momentum $L=1,...,4$ is presented for resonances up to below the 5th single ionization threshold. In addition the expectation value of $\cos(\theta_{12})$ is given for the calculated resonances.