Semi-Empirical Oscillator Strengths and Lifetimes for the P IV Spectrum

Antônio Jamil Mania

doi:10.4236/sar.2017.54005

Abstract

In this work numerical codes carried out in a multiconfiguration Har-tree-Fock relativistic (HFR) approach for the P IV ion are used to obtain the oscillator strengths of each transition as well as the lifetimes of each energy level. With the existing data from several authors that contributed to the spectrum using different light sources, and optimizing the electrostatic parameters by a least-squares procedure when replacing the theoretical values by the experimental ones in the energy matrices, one obtains closer values and according to the observations for the intensities, and also of the lifetimes closer to those that would be obtained experimentally.

Highlights

With the existing data from several authors that contributed to the spectrum using different light sources, and optimizing the electrostatic parameters by a least-squares procedure when replacing the theoretical values by the experimental ones in the energy matrices, one obtains closer values and according to the observations for the intensities, and of the lifetimes closer to those that would be obtained experimentally
P IV spectrum is a member of the Mg-like isoelectronic sequence with a complete core plus a double-electron valence shell giving singlets and triplets terms
The purpose of this study is to present the oscillator strengths and lifetimes for experimentally known electric dipole transitions and energy levels for this spectrum

Summary

Introduction

P IV spectrum is a member of the Mg-like isoelectronic sequence with a complete core plus a double-electron valence shell giving singlets and triplets terms. This sequence has several terms of perturbations, a numerous spin-forbidden lines, and configuration interactions. The observations in the vacuum ultraviolet region were made by using a vacuum spark between electrodes of magnesium or silicon containing compounds of phosphorus.

Objectives

Methods

Results