Radiative Properties of Rb-Isoelectronic Technetium (Tc VII), Ruthenium (Ru VIII) and Rhodium (Rh IX) Ions for Astrophysical Applications

Abstract

In this work, we present high-accuracy spectroscopic properties, such as line strengths, transition probabilities and oscillator strengths for allowed transitions among nD3/2,5/2,n′S1/2 and n′P1/2,3/2(n=4,n′=5,6) states of Rb-isoelectronic Tc (Tc VII), Ru (Ru VIII) and Rh (Rh IX) ions for their applications in the analysis of astrophysical phenomena occurring inside celestial bodies containing Tc, Ru and Rh ions. Due to the scarcity of computational data of atomic properties of these transitions, as well as considerable discrepancies within the literature about these ions, the precise determination of these properties is necessary. For this purpose, we have implemented relativistic many-body perturbation theory (RMBPT) for evaluation of the wave functions of the considered states. For better accuracy, we have accounted for electron interactions through random phase approximation, Brückner orbitals and structural radiations of wave functions in our RMBPT method for further precise evaluation of electric dipole amplitudes. Combining these values of the observed wavelengths, the above transition properties and radiative lifetimes, a number of excited states of Tc VII, Ru VIII and Rh IX ions have been calculated. For further validation of our work, we have compared our results with the data already available in the literature.

Transitional Strength Under Plasma: Precise Estimations of Astrophysically Relevant Electromagnetic Transitions of Ar7, Kr7, Xe7, and Rn7 Under Plasma Atmosphere++++

“…A point to note is that this disagreement is also available in the ratio at the DF level, where we also employed the numerically accurate GRASP92 Code [89]. One of the reasons for this outcome is due to the strong correlation effect from the d-and f-states, as so in similar alkali systems [95]. In addition, the consistency of the accuracy of our calculations can be drawn from the approximate consistency of the ratios 3:2:1 among the transition matrix estimations of 2 P 3/2 → 2 D 5/2 : 2 P 1/2 → 2 D 3/2 : 2 P 3/2 → 2 D 3/2 [96].…”

“…Further, the differences between the calculated matrix elements in the length and velocity gauge forms are characteristic of the preciseness of our calculations. A recent piece of literature [95] also claims that the difference in length gauge and velocity gauge is a measure of accuracy. Another factor of accuracy in ab initio calculations arises from the DF wavefunctions used for correlation calculations.…”