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Title: Odd-parity J=11/2 autoionizing Rydberg series of europium below the 5d {sup 9}D{sub 4} threshold: Spectroscopy and multichannel quantum-defect-theory analysis

Abstract

The odd-parity J=11/2 autoionizing states of europium atom below the 5d {sup 9}D{sub 4} threshold are investigated by a two-step laser photoionization scheme via the 4f{sup 7}5d6p {sup 10}F{sub 9/2} intermediate state. The observed resonances are classified into two autoionizing Rydberg series (with n=15 to 55) converging to the 5d {sup 9}D{sub 4} limit and eight members (n=13 to 20) of two autoionizing Rydberg series converging to the higher 5d {sup 9}D{sub 5} limit. The single series converging to the 5d {sup 9}D{sub 3} limit is not efficiently excited. The observed four Rydberg series are assigned in jj coupling as 5dnd (4,j) and 5dnd (5,j) with j=3/2 and 5/2. Apart from the 5dnd (5,5/2) series, the majority of autoionizing resonances exhibits narrow linewidths and quasisymmetric line shapes, reflecting this way the weak coupling between the discrete levels and the adjacent continua. The experimental data are analyzed through the semiempirical phase-shifted multichannel quantum defect theory. The theoretically calculated energy level positions and excitation profiles are in good agreement with the experimental ones, thus confirming the identification of the observed structures. The constructed Lu-Fano plot and computed admixture coefficients reveal weak and localized interactions among the Rydberg series members.

Authors:
; ;  [1];  [2]
  1. Spectroscopy Division, Bhabha Atomic Research Centre, Mumbai 400085 (India)
  2. Atomic and Molecular Physics Laboratory, Physics Department, University of Ioannina, GR-45110 Ioannina (Greece)
Publication Date:
OSTI Identifier:
21011206
Resource Type:
Journal Article
Journal Name:
Physical Review. A
Additional Journal Information:
Journal Volume: 76; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevA.76.012502; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ATOMS; AUTOIONIZATION; COUPLING; ELECTRONIC STRUCTURE; EUROPIUM; EXCITATION; INTERACTIONS; INTERMEDIATE STATE; LASER RADIATION; LINE WIDTHS; PARITY; PHASE SHIFT; PHOTOIONIZATION; PHOTON-ATOM COLLISIONS; QUANTUM MECHANICS; RESONANCE; RYDBERG STATES; SPECTROSCOPY

Citation Formats

Bhattacharyya, S, Razvi, M A. N., Nakhate, S G, and Cohen, S. Odd-parity J=11/2 autoionizing Rydberg series of europium below the 5d {sup 9}D{sub 4} threshold: Spectroscopy and multichannel quantum-defect-theory analysis. United States: N. p., 2007. Web. doi:10.1103/PHYSREVA.76.012502.
Bhattacharyya, S, Razvi, M A. N., Nakhate, S G, & Cohen, S. Odd-parity J=11/2 autoionizing Rydberg series of europium below the 5d {sup 9}D{sub 4} threshold: Spectroscopy and multichannel quantum-defect-theory analysis. United States. doi:10.1103/PHYSREVA.76.012502.
Bhattacharyya, S, Razvi, M A. N., Nakhate, S G, and Cohen, S. Sun . "Odd-parity J=11/2 autoionizing Rydberg series of europium below the 5d {sup 9}D{sub 4} threshold: Spectroscopy and multichannel quantum-defect-theory analysis". United States. doi:10.1103/PHYSREVA.76.012502.
@article{osti_21011206,
title = {Odd-parity J=11/2 autoionizing Rydberg series of europium below the 5d {sup 9}D{sub 4} threshold: Spectroscopy and multichannel quantum-defect-theory analysis},
author = {Bhattacharyya, S and Razvi, M A. N. and Nakhate, S G and Cohen, S},
abstractNote = {The odd-parity J=11/2 autoionizing states of europium atom below the 5d {sup 9}D{sub 4} threshold are investigated by a two-step laser photoionization scheme via the 4f{sup 7}5d6p {sup 10}F{sub 9/2} intermediate state. The observed resonances are classified into two autoionizing Rydberg series (with n=15 to 55) converging to the 5d {sup 9}D{sub 4} limit and eight members (n=13 to 20) of two autoionizing Rydberg series converging to the higher 5d {sup 9}D{sub 5} limit. The single series converging to the 5d {sup 9}D{sub 3} limit is not efficiently excited. The observed four Rydberg series are assigned in jj coupling as 5dnd (4,j) and 5dnd (5,j) with j=3/2 and 5/2. Apart from the 5dnd (5,5/2) series, the majority of autoionizing resonances exhibits narrow linewidths and quasisymmetric line shapes, reflecting this way the weak coupling between the discrete levels and the adjacent continua. The experimental data are analyzed through the semiempirical phase-shifted multichannel quantum defect theory. The theoretically calculated energy level positions and excitation profiles are in good agreement with the experimental ones, thus confirming the identification of the observed structures. The constructed Lu-Fano plot and computed admixture coefficients reveal weak and localized interactions among the Rydberg series members.},
doi = {10.1103/PHYSREVA.76.012502},
journal = {Physical Review. A},
issn = {1050-2947},
number = 1,
volume = 76,
place = {United States},
year = {2007},
month = {7}
}