Satellite structure in atomic spectra. II. The outer-shell photoelectron spectra of the rare gases

Dyall, K G; Larkins, F P

doi:10.1088/0022-3700/15/2/008

Cited by 74 publications

(24 citation statements)

References 20 publications

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“…This value should be reckoned against the experimentally determined efficiency of ~ 10-4 deduced from fluorescent emissions observed [11,12] in the 10-20 nm range produced by subpicosecond irradiation of atoms at an intensity in the range of -1015 -1016 W/CM2. If the observed state specific branching seen in the fluorescence arises from electronic correlation, as recently suggested [11,12], then known atomic data [32][33][34][35][36][37][38] on the nature of these internal atomic couplings indicate that efficiencies above _ 10-2 may occur in appropriate cases.…”

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confidence: 80%

Limiting cross sections for multiphoton coupling

Boyer

Jara

Luk

et al. 1987

Rev. Phys. Appl. (Paris)

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The availability of extraordinarily bright femtosecond ultraviolet sources is rapidly extending the study of nonlinear atomic responses into an unexplored regime involving intensities in the range of ∼ 10^20 W/cm 2. An estimate is made, covering approximately ten orders of magnitude in intensity, of the effective cross section <σNγ> for nonlinear energy transfer to atoms undergoing subpicosecond irradiation. This treatment, which includes : (a) threshold measurements for low stages of ionization in the low intensity regime (< 10^14 W/cm 2), (b) the experimentally determined average cross section for total energy transfer at an intermediate intensity (∼ 10^16 W/cm 2), and (c) theoretical estimates for the strong field regime (> 10^19 W/cm2), indicates that the cross section for energy transfer in the high intensity (> 10^19 W/cm2) high Z limit falls in a relatively narrow range between simply established upper and lower bounds. The values of these limits are σm = 8 π λ2 c (upper) and the magnitude of the total photoabsorption cross section of Cf at the K edge (lower). Based on this analysis, the maximum cross section for heavy atoms in the high intensity limit is expected to be approximately <σ Nγ> max ∼ 10^-20 cm2, a value which represents an energy transfer rate of ∼ 1 W/atom for an assumed intensity of 10^20 W/cm2. Coupling of this strength would enable the creation of highly energetic and strongly nonequilibrium states of matter and motivates the conclusion that stimulated emission in the X-ray range can be generated by these means

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confidence: 80%

Limiting cross sections for multiphoton coupling

Boyer

Jara

Luk

et al. 1987

Rev. Phys. Appl. (Paris)

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“…The np experimental momentum profiles of Ar, Kr, and Xe are normalized to the DWIA momentum profiles by fitting areas of the experiments up to q = 3.6 au to those of theory. In the normalization procedure spectroscopic factors of 0.975, 0.977, and 0.976 predicted by the CI calculations of Dyall and Larkins 87 are assumed for Ar 3p, Kr 4p, and Xe 5p, respectively. Likewise, the PWIA momentum profiles are scaled by factors of 0.938 for Ar, 0.943 for Kr, and 0.954 for Xe, respectively, so that the area of each np momentum profile is the same as that of the corresponding DWIA one.…”

Section: Ems Studies On One-electron Processesmentioning

confidence: 99%

Looking at Molecular Orbitals in Three-Dimensional Form: From Dream to Reality

Takahashi¹

2009

Bulletin of the Chemical Society of Japan

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Over the last four decades an experimental method has been developed for looking at electron orbitals in momentum space. The method, called electron momentum spectroscopy (EMS), is based on the electron-impact ionizing reaction near the Bethe ridge at incident electron energies of the order of 1 keV or higher. This account reviews frontiers of the field, involving the first approach to molecular frame EMS that enables one to look at molecular orbitals in three-dimensional form.

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“…However, the energy range over which satellite 12 diminishes is very much smaller than the range for He (2p). At 1.0 eV satellite 12 is seen to be increasing again In comparison with higher kinetic energies, the intensities at threshold are either similar (satellites 7, 10) or higher (3,4,11,12). This result suggests that the adiabatic limit does not exist.…”

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confidence: 90%

“…Because of their closed-shell initial states, CI calculations have been carried out for the valence satellites of the rare gases. 3 In the high photon-energy limit, the relative satellite intensities may be calculated from the Cl mixing coefficients. For the "final-ionic state CI channel" in Ne 2p photoemission, for example, much of the intensity is derived from the admixture of the main configuration, Ne+ 12p 5 2 P 0 >, in the final-state wavefunction.…”

Section: Introductionmentioning

confidence: 99%