Unexpected evidence that the main 5d→f transition in atomic uranium lies below the 5d threshold

Pantelouris, M; Connerade, J P

doi:10.1088/0022-3700/16/2/003

Cited by 14 publications

(7 citation statements)

References 18 publications

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“…Noble gases, which are easy to manipulate experimentally and are also easier to handle theoretically, are particularly suited for absorption studies of multielectron excitations. Relatively strong multielectron spectral features have been identified in the measured high-resolution Kand L-edge x-ray-absorption spectra of several noble gases [2,[8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

High-resolution x-ray-emission study of1s4pand1s3dtwo-electron photoexcitations in Kr

et al. 2014

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High-energy-resolution photoexcited KN 2,3 x-ray-emission measurements were carried out on krypton with the excitation energy tuned around the 1s4p and 1s3d double-excitation thresholds. Comprehensive two-dimensional resonant inelastic x-ray-scattering maps were recorded for the range of excitation and emission energies corresponding to both types of double excitations. The double-excitation signal could be clearly resolved from the dominant 1s ionization signal. The latter was subtracted from the measured maps, yielding isolated 1s4p and 1s3d photoexcitation spectra. Both two-electron excitation spectra are well described by a model spectrum built of consecutive bound-bound discrete transitions and shake-up and shake-off channels giving precise energies and intensities of the corresponding contributions. The obtained results are compared with other existing experimental values based on x-ray-absorption measurements and theoretical predictions.

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Section: Introductionmentioning

confidence: 99%

High-resolution x-ray-emission study of1s4pand1s3dtwo-electron photoexcitations in Kr

et al. 2014

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“…To obtain the value Gma8 we used the magnitude of r , = 0 . 4~l O -~e V computed by us (see table l), and the experimental halfwidth 6 = r = 0.1 eV (Pantelouris and Connerade 1983). The magnitude of G = 800 Mb exceeds the maximum values of all other 5d photoabsorption lines in uranium, and the spectral line connected with the transition 7s25f,42 J .…”

Section: L148mentioning

confidence: 56%

“…The only dipole electric transition 7s25f& J,, = O + 5d:/,7s25f:,, J,,= 1 is possible. Supposing that it is this excitation that is connected with the measured sharp line in the spectrum of the gaseous uranium (Pantelouris and Connerade 1983) we calculate the value of GmaX = 800 Mb. To obtain the value Gma8 we used the magnitude of r , = 0 .…”

Section: L148mentioning

confidence: 99%

“…Meanwhile the 5d absorption spectrum of uranium vapour ( Pantelouris and Connerade 1983) greatly differs from the spectrum of metallic uranium. One sharp line has been detected peaking at 115.5 eV which can only be due to a transition between bound electron levels.…”

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confidence: 97%

“…To explain the Sd spectra in uranium (Pantelouris and Connerade 1983) and thorium (Carroll and Costello 1986) vapours we use the same arguments as Radtke (1979) in his comparison between the 4d spectra of lanthanide atoms and solids. Radtke has reveaied that aii ianthaniaes can be ciassiiied inio two groups.…”

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confidence: 99%

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Eroshenko¹

1997

Phys.-Usp.

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The 5d photoabsorption spectra in metallic uranium as well as in thorium in both the solid and gaseous phases are shown io be accounted for by the 5d,l,+5f,,,, 5d,/,+ Sf,,, excitations and photoionization in the continua. A proper interpretation of these spectra can only be made by taking into account a multiplet splitting o f the atomic levels. The spectrum of uranium vapour can be explained by a phenomenon similar to that observed far the lanthanides: the number of 5f electrons decreases by one in the phase transition from vapour to metallic Uranium. It follows that the ground state of gaseous uranium is 71'5f~12, and the peak in the spectrum is due to the 7 ' 5 f : , J,, = 0-5d&,7sZ5f;;, J., = 1 transition. The comparison between the measured spectra in metallic uranium and the theoretical one enables us to conclude that the lifetime of a hole in an atomic shell caused by the ejection of a photoelectron is shorter than the time of the presence of the photoelectron in the atomic volume.

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Giant Resonances in Atoms and in Fluorine Cage Molecules

Mansfield

1987

Giant Resonances in Atoms, Molecules, and Solids

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Unexpected evidence that the main 5d→f transition in atomic uranium lies below the 5d threshold

Cited by 14 publications

References 18 publications

High-resolution x-ray-emission study of1s4pand1s3dtwo-electron photoexcitations in Kr

High-resolution x-ray-emission study of1s4pand1s3dtwo-electron photoexcitations in Kr

Physics news on the Internet (based on electronic preprints)

Giant Resonances in Atoms and in Fluorine Cage Molecules

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