The FERRUM Project: Experimental oscillator strengths of the UV 8 multiplet and other UV transitions from the y6P levels of Fe II

J. C. Pickering; M. P. Donnelly; Hampus Nilsson; A. Hibbert; Sveneric Johansson

doi:10.1051/0004-6361:20021388

The FERRUM Project: Experimental oscillator strengths of the UV 8 multiplet and other UV transitions from the y6P levels of Fe II

J. C. Pickering, M. P. Donnelly, Hampus Nilsson, A. Hibbert, Sveneric Johansson

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Abstract

We report on experimental branching fractions (BFs) for 19 transitions from the three 3d 5( 6S)4s4p( 3P) y6P levels in Fe II, measured in Fourier transform spectra of a Penning discharge lamp and a hollow cathode lamp. The transition wavelengths span the interval between 1600 and 2850 Å. Absolute oscillator strengths ( f-values) have been derived by combining the BFs with experimental radiative lifetimes recently reported in the literature. Theoretical f-values have been calculated using configuration interaction wavefunctions. The new experimental and theoretical f-values are compared with data available in the literature and in databases. The strongest lines measured belong to the UV 8 multiplet of Fe II, which has one ground state transition appearing as a prominent feature at 1608 Å in interstellar spectra. The line is accompanied by a satellite at 1611 Å due to a level mixing, which is discussed in the paper.

Original language	English
Pages (from-to)	715-722
Journal	Astronomy & Astrophysics
Volume	396
Issue number	2
DOIs	https://doi.org/10.1051/0004-6361:20021388
Publication status	Published - 2002

Subject classification (UKÄ)

Astronomy, Astrophysics and Cosmology

Free keywords

atomic data -- line: identification -- techniques: spectroscopic -- stars: abundances -- ISM: abundances

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10.1051/0004-6361:20021388

Pickering_EDP2002

1 Doctoral Thesis (compilation)

Laboratory and stellar spectroscopy of the complex ions Fe+, Mo+, Th+ and U+
Nilsson, H., 2002, Hampus Nilsson, Lund University,. 242 p.
Research output: Thesis › Doctoral Thesis (compilation)

Cite this

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title = "The FERRUM Project: Experimental oscillator strengths of the UV 8 multiplet and other UV transitions from the y6P levels of Fe II",

abstract = "We report on experimental branching fractions (BFs) for 19 transitions from the three 3d 5( 6S)4s4p( 3P) y6P levels in Fe II, measured in Fourier transform spectra of a Penning discharge lamp and a hollow cathode lamp. The transition wavelengths span the interval between 1600 and 2850 {\AA}. Absolute oscillator strengths ( f-values) have been derived by combining the BFs with experimental radiative lifetimes recently reported in the literature. Theoretical f-values have been calculated using configuration interaction wavefunctions. The new experimental and theoretical f-values are compared with data available in the literature and in databases. The strongest lines measured belong to the UV 8 multiplet of Fe II, which has one ground state transition appearing as a prominent feature at 1608 {\AA} in interstellar spectra. The line is accompanied by a satellite at 1611 {\AA} due to a level mixing, which is discussed in the paper.",

keywords = "atomic data -- line: identification -- techniques: spectroscopic -- stars: abundances -- ISM: abundances",

author = "Pickering, {J. C.} and Donnelly, {M. P.} and Hampus Nilsson and A. Hibbert and Sveneric Johansson",

year = "2002",

doi = "10.1051/0004-6361:20021388",

language = "English",

volume = "396",

pages = "715--722",

journal = "Astronomy & Astrophysics",

issn = "0004-6361",

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TY - JOUR

T1 - The FERRUM Project: Experimental oscillator strengths of the UV 8 multiplet and other UV transitions from the y6P levels of Fe II

AU - Pickering, J. C.

AU - Donnelly, M. P.

AU - Nilsson, Hampus

AU - Hibbert, A.

AU - Johansson, Sveneric

PY - 2002

Y1 - 2002

N2 - We report on experimental branching fractions (BFs) for 19 transitions from the three 3d 5( 6S)4s4p( 3P) y6P levels in Fe II, measured in Fourier transform spectra of a Penning discharge lamp and a hollow cathode lamp. The transition wavelengths span the interval between 1600 and 2850 Å. Absolute oscillator strengths ( f-values) have been derived by combining the BFs with experimental radiative lifetimes recently reported in the literature. Theoretical f-values have been calculated using configuration interaction wavefunctions. The new experimental and theoretical f-values are compared with data available in the literature and in databases. The strongest lines measured belong to the UV 8 multiplet of Fe II, which has one ground state transition appearing as a prominent feature at 1608 Å in interstellar spectra. The line is accompanied by a satellite at 1611 Å due to a level mixing, which is discussed in the paper.

AB - We report on experimental branching fractions (BFs) for 19 transitions from the three 3d 5( 6S)4s4p( 3P) y6P levels in Fe II, measured in Fourier transform spectra of a Penning discharge lamp and a hollow cathode lamp. The transition wavelengths span the interval between 1600 and 2850 Å. Absolute oscillator strengths ( f-values) have been derived by combining the BFs with experimental radiative lifetimes recently reported in the literature. Theoretical f-values have been calculated using configuration interaction wavefunctions. The new experimental and theoretical f-values are compared with data available in the literature and in databases. The strongest lines measured belong to the UV 8 multiplet of Fe II, which has one ground state transition appearing as a prominent feature at 1608 Å in interstellar spectra. The line is accompanied by a satellite at 1611 Å due to a level mixing, which is discussed in the paper.

KW - atomic data -- line: identification -- techniques: spectroscopic -- stars: abundances -- ISM: abundances

U2 - 10.1051/0004-6361:20021388

DO - 10.1051/0004-6361:20021388

M3 - Article

SN - 0004-6361

VL - 396

SP - 715

EP - 722

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

IS - 2

ER -

The FERRUM Project: Experimental oscillator strengths of the UV 8 multiplet and other UV transitions from the y6P levels of Fe II

Abstract

Subject classification (UKÄ)

Free keywords

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Research output

Laboratory and stellar spectroscopy of the complex ions Fe+, Mo+, Th+ and U+

Cite this