Relativistic quantum defect orbital study of forbidden transitions in Co¹⁶⁺

Abstract

Abstract. Theoretical line strengths and transition probabilities for electric quadrupole (E2) transitions between levels belonging to several important configurations of Co 16+ are reported. The calculations have been carried out with the Relativistic Quantum Defect Orbital (RQDO) method. A general good accord between the present results and some earlier theoretical data is found. Some of the E2 transition probabilities are reported for the first time. The correct systematic behaviour of the RQDO line strengths along the spectral series is reproduced by the present results in the absence of configuration mixing. This semiempirical method appears to adequately describe E2 transitions in this medium-Z atomic system.

Studies on the E2-transition in CoXVII

“…All line strength results are in close agreement with the relativistic results of Charro et al (2001) and the non-relativistic results of Tull et al (1971). Our line strength data in Table 2 need a multiplicative factor of 1/ √ 2 to compare with others.…”

“…The percentage error is ∼10 −1 whereas in other cases it is ∼10 −2 . In Table 1b, a few of our line strength data are compared with the existing non-relativistic data of Tull et al (1971) and a quasi-relativistic RQDO-data of Charro et al (2001). Similarly in Table 1c, a few of our transition probability data are compared with the relativistic E2-transition probability data of Fuhr et al (1988).…”

“…The present availability of intense tunable radiation sources has made it feasible to measure transition probabilities of electric quadrupole (E2) transitions. However no experimental E2 transition data (Charro et al 2001) for the present system is available in the literature. Very recently Charro et al (2001) have reported line strength data using the quasi-relativistic RQDO-method.…”

“…However no experimental E2 transition data (Charro et al 2001) for the present system is available in the literature. Very recently Charro et al (2001) have reported line strength data using the quasi-relativistic RQDO-method. We have compared our E2-transition probability data with the existing theoretical data of Fuhr et al (1988).…”

E1 and E2 transitions for Fe XVI, Co XVII and Ni XVIII

“…The electric quadrupole (E2) transitions are essential for the diagnostics of the astrophysical and laboratory plasmas. been observed in spectra of many gaseous nebulae (Charro and Martin 2001). Experimental data for forbidden lines are scarce in the literature, since experimental determination of electric quadrupole transition probability is difficult.…”