Electron impact excitation of SiI

Abstract

Abstract. An analytic atomic independent-particle-model is used to generate wave functions for the valence and excited states of the neutral silicon atom. These wave functions are used to calculate generalized oscillator strengths, and from these quantities the cross sections are obtained in the Born approximation. Various excitations from the ground state, 3p2 ( 3 P 0 ), are considered, and results are presented for electron impact energies up to 5 keV.

Blue Lines as Chromospheric Diagnostics: The SiiLines at 3906 and 4103 A

“…This larger value is in agreement with the theoretical calculations by Hibbert (1979), Mendoza & Zeippen (1988), Mukherjee & Ohno (1989), Iglesias, Rogers, & Wilson (1992), Nahar (1993), and Nahar & Pradhan (1993) and with the compilation by Verner, Barthel, & Tytler (1994). The calculations by Ganas (1999), on the other hand, give the smallest value of all : s~1. However, since these calculations are A 51 \ 1.5 ] 108 based on a less accurate model, we adopted the value measured by OÏBrien & Lawler (1991), which is the most recent 2 http ://physics.nist.gov.…”

Spectral properties of neutral selenium and tellurium. A relativistic treatment

“…Garpman et al 11 performed a relativistic self‐consistent‐field (SCF) calculation using the dipole length and the dipole velocity formulas for the transition operator with an accuracy of ∼40% for the strong lines. More recently, Ganas 12 has calculated oscillator strengths for the excitation of neutral sellenium and tellurium from the ground state using a semiempirical analytical independent‐particle‐model (IPM).…”

“…Oscillator strengths for 4 s 2 4 p 4 3 P ‐4 s 2 4 p 3 ( 4 S ) nd 3 S ( n =4–9) fine structure transitions in SeI, and 5 s 2 5 p 4 3 P ‐5 s 2 5 p 3 ( 4 S ) nd 3 S ( n =5–10) fine structure transitions in TeI, are given in Table IV. The only available comparative data for some lines are the IPM f ‐values of Ganas 12, who did not include relativistic effects in his calculation.…”

“…In comparison, little work has been reported for lines corresponding to transitions to more highly excited states. Ganas 12 has reported oscillator strengths for a number of excitations of SeI and TeI from the ground state, but excluded excited states, which are coupled to a 2 D or 2 P core.…”

Spontaneous radiative decay rates in Ga‐like ions

“…Ge II has been observed in the chemically-peculiar B-type star Chi Lupi with the Goddard High Resolution Spectrograph on the Hubble Space Telescope (HST) [1]. As III has been widely studied, both, experimentally and theoretically, given its potential observation in the spectra from the interstellar medium and stellar photospheres.…”