Photon-energy dependence of excited-state Na desorption from Na halides by synchrotron radiation

Hirose, Sayumi; Kamada, Masao

doi:10.1016/0368-2048(96)02935-0

Cited by 2 publications

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“…The excitation spectra for the desorption of the constituents in alkali halides show a prominent peak at the excitation energy of the core excitons, 14 indicating the energy transfer from the core-exciton states to the precursor states of the desorption. Further studies, however, are required to confirm this possibility in BaF 2 , since there are no existing data for the defect-formation and desorption processes of BaF 2 in the vacuum ultraviolet region, as far as we know.…”

Section: Discussionmentioning

confidence: 99%

PHOTOELECTRON-SPECTROSCOPIC STUDY OF CORE-EXCITON DECAY IN AUGER-FREE LUMINESCENCE MATERIAL BaF₂

Kamada

Itoh

2002

Surf. Rev. Lett.

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The nonradiative decay processes of the Ba-5p core exciton in BaF2 have been investigated by using photoelectron spectroscopy, since the exciton peak is missing in the excitation spectrum of the Auger-free luminescence. The decay probability of the direct recombination process estimated from the constant-initial state spectrum and the absorption coefficient was found to be smaller than unity, indicating the existence of the other decay processes. It is suggested that the Ba-5p core exciton is relaxed by about 0.9 eV.

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Section: Discussionmentioning

confidence: 99%

PHOTOELECTRON-SPECTROSCOPIC STUDY OF CORE-EXCITON DECAY IN AUGER-FREE LUMINESCENCE MATERIAL BaF₂

Kamada

Itoh

2002

Surf. Rev. Lett.

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Nonradiative decay of core excitons in the Auger-free luminescence materials CsCl andBaF2

Kamada

Itoh

2002

Phys. Rev. B

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The present work has been conducted to understand the decay processes of the Cs-5p and Ba-5p core excitons in CsCl and BaF 2 , respectively, where the Auger decay process of the Cs-5p and Ba-5p core holes is energetically forbidden. The core-exciton peaks are missing in the excitation spectra for the Auger-free luminescence, which arises from a radiative decay of the valence electrons into these core holes. Resonant enhancement effects of the valence-band photoelectron spectra are observed around 13 eV for CsCl and 17 eV for BaF 2 . The effects are attributed to the nonradiative decay through the direct-recombination process of an excited electron and the Cs-5p or Ba-5p core hole forming the core exciton. It is also found that the core exciton deforms its surrounding lattice with relaxation energies of about 0.3 eV in CsCl and 0.9 eV in BaF 2 . The nonradiative direct-recombination probabilities of the core excitons are estimated to be about 32% and 75% for CsCl and BaF 2 , respectively, by taking account of the lattice relaxation effects.

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Photon-energy dependence of excited-state Na desorption from Na halides by synchrotron radiation

Cited by 2 publications

References 11 publications

PHOTOELECTRON-SPECTROSCOPIC STUDY OF CORE-EXCITON DECAY IN AUGER-FREE LUMINESCENCE MATERIAL BaF₂

PHOTOELECTRON-SPECTROSCOPIC STUDY OF CORE-EXCITON DECAY IN AUGER-FREE LUMINESCENCE MATERIAL BaF₂

Nonradiative decay of core excitons in the Auger-free luminescence materials CsCl andBaF2

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Photon-energy dependence of excited-state Na desorption from Na halides by synchrotron radiation

Cited by 2 publications

References 11 publications

PHOTOELECTRON-SPECTROSCOPIC STUDY OF CORE-EXCITON DECAY IN AUGER-FREE LUMINESCENCE MATERIAL BaF2

PHOTOELECTRON-SPECTROSCOPIC STUDY OF CORE-EXCITON DECAY IN AUGER-FREE LUMINESCENCE MATERIAL BaF2

Nonradiative decay of core excitons in the Auger-free luminescence materials CsCl andBaF2

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PHOTOELECTRON-SPECTROSCOPIC STUDY OF CORE-EXCITON DECAY IN AUGER-FREE LUMINESCENCE MATERIAL BaF₂

PHOTOELECTRON-SPECTROSCOPIC STUDY OF CORE-EXCITON DECAY IN AUGER-FREE LUMINESCENCE MATERIAL BaF₂