Eur. Phys. J. D (2016) 70: 196
https://doi.org/10.1140/epjd/e2016-70346-7

Regular Article

Spectroscopy of low lying transitions of He confined in a fullerene cage

¹ Department of Physics, Ramakrishna Mission Vivekananda University, P.O.-Belur Math, Howrah, West Bengal 711202, India
² Institut für Physik, Universität Kassel, 34109 Kassel, Germany

^a e-mail: profpkmukherjee@gmail.com

Received: 23 May 2016
Received in final form: 25 July 2016
Published online: 4 October 2016

Abstract

Using time dependent coupled Hartree-Fock(TDCHF) theory, we estimate structural properties such as total energy, ionisation potential, static and dynamic polarizabilities, oscillator strengths and transition probabilities for the first three dipolar excitations 1s²:¹S^e → 1snp:¹P^o (n = 2,3,4) and quadrupolar excitations 1s²:¹S^e → 1snd:¹D^e (n = 3,4,5) of a helium atom placed at the centre of a fullerene cage. We estimate these structural properties using the fullerene cage potential based on experimental findings, including both neutral and charged fullerene potentials. Systematics have been observed with respect to the nature of the charge on fullerene compared to neutral species. We highlight interesting behavior of the excited state wavefunctions for the central atom, leading to altered behavioral patterns of the relevant properties.