Ulf Griesmann, Józef Musielok, and Wolfgang L. Wiese, "Branching fractions and transition probabilities for transitions from 2p4 3p, 2p4 3d, and 2p4 4s levels of Ne ii," J. Opt. Soc. Am. B 14, 2204-2211 (1997)
Branching fractions for electric dipole transitions from
and upper levels in singly ionized neon atoms excited in a high-current hollow-cathode lamp were measured. Transition probabilities for many weak intercombination lines were determined for the first time to the authors’ knowledge. The measurements were carried out with two different techniques to minimize the effect of systematic errors, first in an experiment with a 2-m grating monochromator and then with a Fourier transform spectrometer. The uncertainty of the branching fraction data is 4%(1σ) for lines corresponding to -allowed transitions and 30%(1σ) for weak intercombination lines. For 14 upper levels complete sets of transitions could be measured that enabled us to determine absolute transition probabilities when lifetime data for the upper levels were available.
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For these lines experimental lifetimes τ for the upper state were available. Lines that were too weak to be observed are marked Not Obs. The two right-most columns contain the transition probabilities compiled by Burshtein and Vujnović25 and branching fractions according to coupling for comparison. The 1σ uncertainty (standard deviation) of the transition probabilities is 11% for strong lines and increases to 32% for weaker lines. The 1σ uncertainty (standard deviation) of the measured branching fractions is 4% for strong lines but increases to 30% for weaker lines. All tabulated transition probabilities are in units of The lifetimes for the and levels were measured by Donnelly et al.18 in a cascade-free experiment. The uncertainties quoted for the other lifetimes do not include an estimate of the systematic uncertainty that is due to cascade effects.
Table 2
Branching Fractions for Lines from the Upper Levela
The lifetime of the upper level is not known. The right-most column contains branching fractions derived from LS-coupling calculations for comparison. The 1σ uncertainty (standard deviation) of the measured branching fractions is 4%.
Not Obs., not observed.
Table 3
Relative Transition Probabilities for Lines Grouped According to Upper Levela
From these levels additional transitions to the ground state of Ne ii occur. Those transitions generally correspond to strong lines in the VUV outside the wavelength range that was accessible to our experiments. The 1σ uncertainty (standard deviation) of the relative transition probabilities is 4% for strong lines and increases to 30% for weaker lines. The relative transition probabilities are not normalized.
Not Obs., not observed.
Tables (3)
Table 1
Branching Fractions and Transition Probabilities for Complete Sets of Linesa
For these lines experimental lifetimes τ for the upper state were available. Lines that were too weak to be observed are marked Not Obs. The two right-most columns contain the transition probabilities compiled by Burshtein and Vujnović25 and branching fractions according to coupling for comparison. The 1σ uncertainty (standard deviation) of the transition probabilities is 11% for strong lines and increases to 32% for weaker lines. The 1σ uncertainty (standard deviation) of the measured branching fractions is 4% for strong lines but increases to 30% for weaker lines. All tabulated transition probabilities are in units of The lifetimes for the and levels were measured by Donnelly et al.18 in a cascade-free experiment. The uncertainties quoted for the other lifetimes do not include an estimate of the systematic uncertainty that is due to cascade effects.
Table 2
Branching Fractions for Lines from the Upper Levela
The lifetime of the upper level is not known. The right-most column contains branching fractions derived from LS-coupling calculations for comparison. The 1σ uncertainty (standard deviation) of the measured branching fractions is 4%.
Not Obs., not observed.
Table 3
Relative Transition Probabilities for Lines Grouped According to Upper Levela
From these levels additional transitions to the ground state of Ne ii occur. Those transitions generally correspond to strong lines in the VUV outside the wavelength range that was accessible to our experiments. The 1σ uncertainty (standard deviation) of the relative transition probabilities is 4% for strong lines and increases to 30% for weaker lines. The relative transition probabilities are not normalized.
Not Obs., not observed.
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