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Implications of configuration interaction wavefunctions in length and velocity theoretical determination of generalized oscillator strengths for the excitations to 2p 5 (3d,4s, 4d, 4f) of neon

Implications of configuration interaction wavefunctions in length and velocity theoretical determination of generalized oscillator strengths for the excitations to 2p 5 (3d,4s, 4d, 4f) of neon The generalized oscillator strengths (GOSs) of 2p 5 (3d,4s, 4d, 4f) states excited from neon ground state, are studied by the configuration interaction (C I) method and the random phase approximation with ex- change (RPAE). Wavefunctions of these states obtained from the configuration interaction code CIV3 of Hibbert are employed to compute these GOSs. We report results of calculations for both the velocity and length formulations of the GOS for the neon transitions 2p 6 ? 2p 5 4s, 2p 6 ? 2p 5 (3d,4d) and 2p 6 ? 2p 5 4f respectively for multipole strengths  = 1,  = 1, 3 and  = 2, 4 respectively. The results show remarkable agreement among the extrema positions resulting from the velocity and length forms despite the rather different absolute values of GOS they reveal. This work reduces significantly the difference between the extrema positions of the GOS obtained in the theoretical calculations of Amusia et al. and those exper- imentally found by Chen et al. for dipole 2p 6 ? 2p 5 4s transition. The profiles of our calculated GOS are in agreement with the theoretical results of Amusia et al. In the present work, for the 2p 6 ? 2p 5 (3d,4d) transitions, our length dipole RPAE GOS curves agree with the pictures obtained from the data RPAE GOS of Amusia et al. while the length octupole GOS have values smaller than those of the Amusia et al . GOS results except in the small squared transferred momentum K 2 region. Good agreement between our length RPAE GOS and the recent RPAE results of Amusia et al. is found for the quadrupole excitation to 2p 5 4f. The results of length and velocity hexadecapole GOS are comparable with each other for the same transition, and experimental work is needed. The present calculations also reveal that the electron correlations effects are noticeable around the region of the GOS maxima.


Auteur(s) : Louis Gomis, Moustapha Sadibou Tall , Alan Hibbert , Saïdou Diallo , Ibrahima Guèye. Faye , Ismaïla Diédhiou , Christian Sina Diatta
Pages : Pages : 128 - 135
Année de publication : 2017
Revue : Journal of Quantitative Spectroscopy & Radiative Transfer
N° de volume : 201
Type : Article
Mise en ligne par : TALL Moustapha Sadibou