Photoionization of Fe7+ from the ground and metastable states

Collection:
Clark Atlanta University Faculty Publications
Title:
Photoionization of Fe7+ from the ground and metastable states
Creator:
Zatsarinny,Oleg
Tayal, S.S.
Date of Original:
2015
Subject:
African Americans--Education (Higher)--Georgia
Clark Atlanta University
Location:
United States, Georgia, Fulton County, Atlanta, 33.749, -84.38798
Medium:
articles
Type:
Text
Format:
application/pdf
Description:
Abstract: The B-spline Breit-Pauli R-matrix method is used to investigate the photoionization of Fe7+ from the ground and metastable states in the energy region from ionization thresholds to 172 eV. The present calculations were designed to resolve the large discrepancies between recent measurements and available theoretical results. The multiconfiguration Hartree-Fock method in connection with B-spline expansions is employed for an accurate representation of the initial- and final-state wave functions. The close-coupling expansion includes 99 fine- structure levels of the residual Fe8+ ion in the energy region up to 3s23p54s states. It includes levels of the 3s23p6, 3s23p53d, 3s23p54s, and 3s3p63d configurations and some levels of the 3s23p43d2 configuration which lie in the energy region under investigation. The present photoionization cross sections in the length and velocity formulations exhibit excellent agreement. The present photoionization cross sections agree well with the Breit-Pauli R-matrix calculation by Sossah et al. and the TOPbase data in the magnitude of the background nonresonant cross sections but show somewhat richer resonance structures, which qualitatively agree with the measurements. The calculated cross sections, however, are several times lower than the measured cross sections, depending upon the photon energy. The cross sections for photoionization of metastable states were found to have approximately the same magnitude as the cross sections for photoionization of the ground state, thereby the presence of metastable states in the ion beam may not be the reason for the enhancement of the measured cross sections.
Source: Physical Review A
DOI: https://doi.org/10.1103/PhysRevA.91.013413
Metadata URL:
http://hdl.handle.net/20.500.12322/cau.ir:2015_zatsarinny_oleg_1
Language:
eng
Original Collection:
Clark Atlanta University Faculty Publications
Holding Institution:
Clark Atlanta University
Rights:

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