Diffuse interstellar band from the spectrum of auto-ionizing helium

Aekawit Kittiya; Apimook Watcharangkool; Suwicha Wannawichian; Waranont Anukool

doi:10.1117/12.2550805

11 March 2020 Diffuse interstellar band from the spectrum of auto-ionizing helium

Aekawit Kittiya, Apimook Watcharangkool, Suwicha Wannawichian, Waranont Anukool

Proceedings Volume 11331, Fourth International Conference on Photonics Solutions (ICPS2019); 113310N (2020) https://doi.org/10.1117/12.2550805
Event: Fourth International Conference on Photonic Solutions (ICPS 2019), 2019, Chiang Mai, Thailand

Abstract

We explore the possibility of using transition energies of a doubly excited helium atom to describe the absorption lines of interstellar medium. We follow the method of approximated separation of variables in hypersperical coordinate in solving the energy levels of doubly excited helium. Although the results do not exactly match with the absorption spectrum of the diffuse interstellar bands, they show some correlation. We have also shown that the distribution of the difference between observed spectrum and the calculated result can be fit by normal distribution with the mean value close to zero. Furthermore, we argued that the distribution obtained from randomly generated lines are significantly different from the calculated result.

Citation Download Citation

Aekawit Kittiya, Apimook Watcharangkool, Suwicha Wannawichian, and Waranont Anukool "Diffuse interstellar band from the spectrum of auto-ionizing helium", Proc. SPIE 11331, Fourth International Conference on Photonics Solutions (ICPS2019), 113310N (11 March 2020); https://doi.org/10.1117/12.2550805

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