J/ApJS/234/27 FeXIX-XXV recombination lines (Shah+, 2018)
Polarization of K-shell dielectronic recombination satellite lines of FeXIX-XXV
and its application for diagnostics of anisotropies of hot plasmas.
Shah C., Amaro P., Steinbrugge R., Bernitt S., Lopez-Urrutia J.R.C.,
Tashenov S.
<Astrophys. J. Suppl. Ser., 234, 27 (2018)>
=2018ApJS..234...27S 2018ApJS..234...27S
ADC_Keywords: Atomic physics ; Polarization
Keywords: atomic data; atomic processes; line: formation;
methods: laboratory: atomic; plasmas; polarization
Abstract:
We present a systematic measurement of the X-ray emission asymmetries
in the K-shell dielectronic, trielectronic, and quadruelectronic
recombination of free electrons into highly charged ions. Iron ions in
He-like through O-like charge states were produced in an electron beam
ion trap, and the electron-ion collision energy was scanned over the
recombination resonances. Two identical X-ray detectors mounted
head-on and side-on with respect to the electron beam propagation
recorded X-rays emitted in the decay of resonantly populated states.
The degrees of linear polarization of X-rays inferred from observed
emission asymmetries benchmark distorted-wave predictions of the
Flexible Atomic Code for several dielectronic recombination satellite
lines. The present method also demonstrates its applicability for
diagnostics of energy and direction of electron beams inside hot
anisotropic plasmas. Both experimental and theoretical data can be
used for modeling of hot astrophysical and fusion plasmas.
Description:
The experiment was performed at FLASH-EBIT at the Max-Planck-Institut
fur Kernphysik, Heidelberg, Germany. The FLASH-EBIT is described in
detail by Epp et al. (2010JPhB...43s4008E 2010JPhB...43s4008E). Overall, FLASH-EBIT was
operated under ultrahigh vacuum conditions (≤5x10-10mbar).
See section 2 for further explanations.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 118 55 Measured emission asymmetry R between perpendicular
and parallel observation of X-rays emitted due to
dielectronic, trielectronic, and quadruelectronic
recombination
table4.dat 150 22 Fe XXV theoretical data.
Initial (ground) state: [1s2]0
table5.dat 150 90 Fe XXIV theoretical data.
Initial (ground) state: [1s22s]1/2
table6.dat 150 181 Fe XXIII theoretical data.
Initial (ground) state: [1s22s]1/2
table7.dat 150 180 Fe XXII theoretical data.
Initial (ground) state: [1s22s22p1/2]1/2
table8.dat 150 91 Fe XXI theoretical data.
Initial (ground) state: [1s22s22p1/22]0
table9.dat 150 22 Fe XX theoretical data.
Initial (ground) state:
[1s22s22p1/222p3/2]3/2
table10.dat 150 2 Fe XIX theoretical data.
Initial (ground) state:
[1s22s22p1/222p3/22]2
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Label [1/39]? Label index (1)
4- 5 A2 --- Ion Initial ionic charge state before the
recombination
7- 8 A2 --- RP Order of the recombination processes (G1)
10- 73 A64 --- IntState Intermediate excited state configuration
of the ion (G2)
75- 80 F6.1 eV Eres [4554.4/5080.1] Theorical resonance energy
82- 87 F6.1 eV Eres2 [4604.2/5081.1]? Experimental resonance energy
from the fits (except flagged)
89- 91 F3.1 eV e_Eres2 [0.1/1.8]? 1σ uncertainty
93- 96 A4 --- f_Eres2 Flag on Eres2 (2)
98-102 F5.2 --- R [-0.5/0.6]? Experimental emission asymmetry (3)
104-107 F4.2 --- e_R [0.02/0.7]? 1σ uncertainty on R
109-112 A4 --- f_R Flag on R (2)
114-118 F5.2 --- R2 [-0.7/0.6]? Theoretical emission asymmetry (3)
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Note (1): Those labels identify the resonances in Figure 2 made of a single or
an ensemble of unresolved intermediate excited states.
Note (2): Flag as follows:
bl. = blend
fix. = fixed
cal. = calibrated
norm = normalized
Note (3): We quantify the emission asymmetries by the ratio given in Eq. (1):
R=(I(90°)-I(0°))/I(90°) with I, the intensities.
See section 3.
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Byte-by-byte Description of file: table[4-9].dat table10.dat
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Bytes Format Units Label Explanations
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1- 2 I2 -- i [4/50] Energy level index
4- 5 A2 -- RP Order of the recombination processes (G1)
7- 57 A51 -- IntState Intermediate excited state configuration
of the ion (G2)
59- 65 F7.2 eV Eres [4554.4/5173.8] Resonance energy
67- 75 A9 cm2.eV Strength Total DR strength
77- 82 F6.3 -- A2 [-1.2/0.7] Alignment parameter
84-126 A43 -- FinState Final state configuration
128-134 F7.2 eV Exray [6205.6/6781.9] X-ray energy
136-143 A8 s-1 Ar Radiative decay rates
145-150 F6.3 -- Pol [-1/0.7] Degree of linear polarization
of DR X-rays
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Global notes:
Note (G1): Order of the recombination processes as follows:
DR = dielectronic recombination (Burgess, 1964ApJ...139..776B 1964ApJ...139..776B)
TR = trielectronic recombination
QR = quadruelectronic recombination.
See section 1 for further explanations.
Note (G2): Given in a latex ready format. Standard j-j coupling
notations are used here to define atomic configurations. The subscript
following the round bracket denotes angular momentum of the coupled
subshells and another subscript following the square bracket denotes the
total angular momentum of the given state.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 21-Mar-2018