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Oscillator strengths for high-excitation Ti II from laboratory measurements and calculations

Lundberg, H. LU ; Hartman, H. LU ; Engström, L. LU ; Nilsson, H. LU ; Persson, A. I. H. LU ; Palmeri, P.; Quinet, P.; Fivet, V.; Malcheva, G. and Blagoev, K. (2016) In Monthly Notices of the Royal Astronomical Society 460(1). p.356-362
Abstract

This work reports new experimental radiative lifetimes of six 3d2(3F)5s levels in singly ionized titanium, with an energy around 63 000 cm-1 and four 3d2(3F)4p odd parity levels where we confirm previous investigations. Combining the new 5s lifetimes with branching fractions measured previously by Pickering et al., we report 57 experimental log gf values for transitions from the 5s levels. The lifetime measurements are performed using time-resolved laser-induced fluorescence on ions produced by laser ablation. One- and two-step photon excitation is employed to reach the 4p and 5s levels, respectively. Theoretical calculations of the radiative lifetimes of the measured levels as well... (More)

This work reports new experimental radiative lifetimes of six 3d2(3F)5s levels in singly ionized titanium, with an energy around 63 000 cm-1 and four 3d2(3F)4p odd parity levels where we confirm previous investigations. Combining the new 5s lifetimes with branching fractions measured previously by Pickering et al., we report 57 experimental log gf values for transitions from the 5s levels. The lifetime measurements are performed using time-resolved laser-induced fluorescence on ions produced by laser ablation. One- and two-step photon excitation is employed to reach the 4p and 5s levels, respectively. Theoretical calculations of the radiative lifetimes of the measured levels as well as of oscillator strengths for 3336 transitions from these levels are reported. The calculations are carried out by a pseudorelativistic Hartree-Fock method taking into account core-polarization effects. The theoretical results are in a good agreement with the experiments and are needed for accurate abundance determinations in astronomical objects.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Atomic, Atomic data - methods, Laboratory
in
Monthly Notices of the Royal Astronomical Society
volume
460
issue
1
pages
7 pages
publisher
Wiley-Blackwell
external identifiers
  • scopus:84979072994
  • wos:000379835200026
ISSN
0035-8711
DOI
10.1093/mnras/stw922
language
English
LU publication?
yes
id
28ed3ae1-40d3-42d2-a442-f84db932973b
date added to LUP
2017-01-09 09:35:42
date last changed
2017-09-18 11:35:27
@article{28ed3ae1-40d3-42d2-a442-f84db932973b,
  abstract     = {<p>This work reports new experimental radiative lifetimes of six 3d<sup>2</sup>(<sup>3</sup>F)5s levels in singly ionized titanium, with an energy around 63 000 cm<sup>-1</sup> and four 3d<sup>2</sup>(<sup>3</sup>F)4p odd parity levels where we confirm previous investigations. Combining the new 5s lifetimes with branching fractions measured previously by Pickering et al., we report 57 experimental log gf values for transitions from the 5s levels. The lifetime measurements are performed using time-resolved laser-induced fluorescence on ions produced by laser ablation. One- and two-step photon excitation is employed to reach the 4p and 5s levels, respectively. Theoretical calculations of the radiative lifetimes of the measured levels as well as of oscillator strengths for 3336 transitions from these levels are reported. The calculations are carried out by a pseudorelativistic Hartree-Fock method taking into account core-polarization effects. The theoretical results are in a good agreement with the experiments and are needed for accurate abundance determinations in astronomical objects.</p>},
  author       = {Lundberg, H. and Hartman, H. and Engström, L. and Nilsson, H. and Persson, A. I. H. and Palmeri, P. and Quinet, P. and Fivet, V. and Malcheva, G. and Blagoev, K.},
  issn         = {0035-8711},
  keyword      = {Atomic,Atomic data - methods,Laboratory},
  language     = {eng},
  month        = {07},
  number       = {1},
  pages        = {356--362},
  publisher    = {Wiley-Blackwell},
  series       = {Monthly Notices of the Royal Astronomical Society},
  title        = {Oscillator strengths for high-excitation Ti II from laboratory measurements and calculations},
  url          = {http://dx.doi.org/10.1093/mnras/stw922},
  volume       = {460},
  year         = {2016},
}