Experimental transition probabilities of the infrared lines 3p–4s of Ne I and 4p–5s of Ar I

Relative transition probabilities for the infrared lines 3p–4s of Ne I and 4p–5s of Ar I have been determined from emission line-intensity measurements of optically thin light sources. In this experiment a photoconductive cell and a digital phase-sensitive amplifier have been used for light detection. Transition probabilities have been put on an absolute scale by using the Coulomb approximation. The present experimental data are compared with the existing theoretical data for neon and with experimental and theoretical data for argon.

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RELATIVE TRANSITION PROBABILITIES IN NEON

Canadian Journal of Physics ◽

10.1139/p66-151 ◽

1966 ◽

Vol 44 (8) ◽

pp. 1781-1786 ◽

Cited By ~ 6

Author(s):

J. C. Irwin ◽

R. A. Nodwell

Keyword(s):

Emission Line ◽

Line Intensity ◽

Transition Probabilities ◽

Atomic Transition ◽

Temperature Measurements ◽

Intensity Measurements ◽

Relative Transition ◽

Reversal Temperature

The relative atomic transition probabilities for the transitions between the 2p53p and 2p53s configurations of NeI have been measured by combining reversal temperature measurements with relative emission line intensity measurements. The relative emission intensities were corrected for self-absorption. The results are compared with those obtained by previous workers.

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Excitation of the 3s3p62S and 3s23p44s2P Levels of Ar+ and the 736 Å Line of Ne by Electrons

Canadian Journal of Physics ◽

10.1139/p74-108 ◽

1974 ◽

Vol 52 (9) ◽

pp. 786-794 ◽

Cited By ~ 18

Author(s):

K-H. Tan ◽

F. G. Donaldson ◽

J. W. McConkey

Keyword(s):

Excitation Function ◽

Line Intensity ◽

Transition Probabilities ◽

Normalization Procedure ◽

Excitation Process ◽

Line Intensities ◽

Intensity Measurements ◽

Careful Measurement ◽

Relative Transition ◽

Good Agreement

Polarization free measurements are presented of the excitation of the 3s3p62S and 3s23p44s2P levels of Ar+ by electron impact. Line intensity measurements yielded relative transition probabilities in good agreement with the recent calculations of Luyken. A double peaked structure is demonstrated to be a common feature of the excitation functions and reasons for this are discussed. Cascade is shown to be an important excitation process for the 4s levels. Comparison is made with other work where available. As a means of calibration of some of the Ar line intensities, a careful measurement was made of the 736 Å Ne excitation function using the Bethe normalization procedure and the known optical oscillator strength.

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EELS white line intensities calculated for the 3d and 4d metals

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100153919 ◽

1989 ◽

Vol 47 ◽

pp. 388-389

Author(s):

C. C. Ahn ◽

D. H. Pearson ◽

P. Rez ◽

B. Fultz

Keyword(s):

Experimental Data ◽

Line Intensity ◽

Transition Probabilities ◽

Initial Increase ◽

White Line ◽

Hartree Fock ◽

Line Intensities ◽

Integrated Intensity ◽

X Ray Absorption ◽

The Continuum

Previous experimental measurements of the total white line intensities from L2,3 energy loss spectra of 3d transition metals reported a linear dependence of the white line intensity on 3d occupancy. These results are inconsistent, however, with behavior inferred from relativistic one electron Dirac-Fock calculations, which show an initial increase followed by a decrease of total white line intensity across the 3d series. This inconsistency with experimental data is especially puzzling in light of work by Thole, et al., which successfully calculates x-ray absorption spectra of the lanthanide M4,5 white lines by employing a less rigorous Hartree-Fock calculation with relativistic corrections based on the work of Cowan. When restricted to transitions allowed by dipole selection rules, the calculated spectra of the lanthanide M4,5 white lines show a decreasing intensity as a function of Z that was consistent with the available experimental data.Here we report the results of Dirac-Fock calculations of the L2,3 white lines of the 3d and 4d elements, and compare the results to the experimental work of Pearson et al. In a previous study, similar calculations helped to account for the non-statistical behavior of L3/L2 ratios of the 3d metals. We assumed that all metals had a single 4s electron. Because these calculations provide absolute transition probabilities, to compare the calculated white line intensities to the experimental data, we normalized the calculated intensities to the intensity of the continuum above the L3 edges. The continuum intensity was obtained by Hartree-Slater calculations, and the normalization factor for the white line intensities was the integrated intensity in an energy window of fixed width and position above the L3 edge of each element.

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Transition probabilities for lines arising from the 3d4 4p configuration of Cr(II)

Canadian Journal of Physics ◽

10.1139/p94-010 ◽

1994 ◽

Vol 72 (1-2) ◽

pp. 57-60 ◽

Cited By ~ 13

Author(s):

A. M. Gonzalez ◽

M. Ortiz ◽

J. Campos

Keyword(s):

Experimental Data ◽

Emission Line ◽

Sum Rules ◽

Transition Probabilities ◽

Line Strength ◽

Line Intensities ◽

Cr Content ◽

Absolute Scale ◽

Relative Transition ◽

Thin Plasma

Relative transition probabilities for 43 lines arising from the 3d4 4p configuration of Cr(II) with cores 3d4 (5D), 3d4 (3P), and 3d4 (3H) were determined from measurements of emission-line intensities in a laser produced plasma. This experiment was carried out with Al–Cr alloys with a Cr content of about 0.1%, in order to have an optically thin plasma. Transition probabilities were placed on an absolute scale by using, where possible, accurate experimental lifetimes from the literature and line-strength sum rules. Comparison of the present results with the available theoretical and experimental data are made.

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Experimental transition probabilities for 4p – 4d spectral lines in V II

Astronomy and Astrophysics ◽

10.1051/0004-6361/201834795 ◽

2019 ◽

Vol 622 ◽

pp. A154 ◽

Cited By ~ 1

Author(s):

H. Nilsson ◽

J. Andersson ◽

L. Engström ◽

H. Lundberg ◽

H. Hartman

Keyword(s):

Transition Probabilities ◽

Branching Fractions ◽

Theoretical Data ◽

Spectral Lines ◽

Time Resolved ◽

Excitation Scheme ◽

Photon Excitation ◽

Experimental Transition ◽

Experimental Values ◽

Absolute Transition

Aims. We aim to measure lifetimes of levels belonging to the 3d3(4F)4d subconfiguration in V II, and derive absolute transition probabilities by combining the lifetimes with experimental branching fractions.Methods. The lifetimes were measured using time-resolved laser-induced fluorescence in a two-photon excitation scheme. The branching fractions were measured in intensity calibrated spectra from a hollow cathode discharge lamp, recorded with a Fourier transform spectrometer.Results. We report lifetimes for 13 levels at an energy around 73 000 cm−1. Absolute transition probabilities of 78 lines are derived by combining the lifetimes and branching fractions. The experimental values are compared with theoretical data from the literature.

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