Two‐Photon Spectroscopy in CsI and CsBr

Fröhlich, D.; Staginnus, B.; Onodera, Yositaka

doi:10.1002/pssb.19700400213

Cited by 25 publications

(6 citation statements)

References 15 publications

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“…transitions at 6.05 eV as the bandgap energy for Γ 8 --Γ 6 + [40]. Generally, one would expect two photons to excite transitions to p-type exciton-polaritons below the bandgap, as for example observed for KI [41].…”

Section: Bandgap and Binding Energymentioning

confidence: 92%

“…Generally, one would expect two photons to excite transitions to p-type exciton-polaritons below the bandgap, as for example observed for KI [41]. However, those were not observed by them [40].…”

Section: Bandgap and Binding Energymentioning

confidence: 96%

“…Fröhlich et al also measured the two-photon absorption spectrum of CsBr and again interpreted the first rise of the signal at 7.18 eV as the Γ 8 --Γ 6 + bandgap [40].…”

Section: Bandgap and Binding Energymentioning

confidence: 96%

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Band-structure parameters and Fermi resonances of exciton-polaritons in CsI and CsBr under hydrostatic pressure

et al. 2006

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Most alkali halides crystallize in the fcc sodium chloride structure. In contrast, with the exception of CsF, the Cs-halides form the simple cubic cesium chloride (CsCl) structure at ambient conditions and they have a substantially different electronic structure than other alkali halides; in particular, they have several nearly degenerate electronic levels near the Brillouin zone center. Highly resolved Three-Photon Spectroscopy (TPS) measurements allow direct observation of the near band edge structure and, in the case of CsI, probe more states than one-photon techniques. A number of interesting phenomena, among them level repulsion (Fermi resonance), occur as these levels are tuned through one another by application of hydrostatic pressure. To the best of our knowledge, this has been

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Section: Bandgap and Binding Energymentioning

confidence: 92%

Section: Bandgap and Binding Energymentioning

confidence: 96%

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Band-structure parameters and Fermi resonances of exciton-polaritons in CsI and CsBr under hydrostatic pressure

et al. 2006

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“…Eq.2-18 becomes 77 -Ci , 71-= 5 (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21) It is seen that U' must belong to the same representation as U . U:"I')…”

mentioning

confidence: 99%

Polarization Dependence of Two-Photon Absorption in Solids

1968

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“…The band gap of CsI at T = 20 K has been reported as 6.02 eV on the basis of two-photon spectroscopy 43 . From this we may estimate the room-temperature band gap of CsI as 5.8 eV 9,44 The CsI light yield at 100 K thus implies β ≈ 1.5 if the light emission is 100 % efficient and if we use the 5.8 eV band gap.…”

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confidence: 99%

Coupled rate and transport equations modeling proportionality of light yield in high-energy electron tracks: CsI at 295 K and 100 K; CsI:Tl at 295 K

Bizarri

et al. 2015

Phys. Rev. B

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A high-energy electron in condensed matter deposits energy by creation of electron-hole pairs whose density generally increases as the electron slows, reaching the order of 10 20 eh/cm 3 near the end of its track. The subsequent interactions of the electrons and holes include nonlinear rate terms and transport as first hot and then thermalized carriers in the nanometer-scale radial dimension of the track. Charge separation and strong radial electric fields occur in a material such as CsI with contrasting diffusion rates of self-trapped holes and hot electrons. Eventual radiative recombination has a nonlinear relation to the primary electron energy because of these interactions. This socalled intrinsic nonproportionality of electron response limits achievable energy resolution of a given scintillation radiation detector material. We use a system of coupled transport and rate equations to describe a pure host (3 equations) and one dopant (4 more equations per dopant). Applying it first to the experimentally well-characterized system of CsI and CsI:Tl in this work, we use results of picosecond absorption spectroscopy, interband z-scan measurements of nonlinear rate constants, and other experiments and calculations to determine most of the more than 20 rate and transport coefficients required for modeling. The model is solved in a track environment approximated as cylindrical and is compared to the proportionality curve and total light yield of undoped CsI at temperatures of 295 K and 100 K, as well as thallium dopant in CsI:Tl at 295 K. With this degree of validation, the space-and time-distributions of carriers and excitons, both untrapped and trapped, are examined within the model to gain an understanding of the main competitions controlling the nonproportionality of response.

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Two‐Photon Spectroscopy in CsI and CsBr

Cited by 25 publications

References 15 publications

Band-structure parameters and Fermi resonances of exciton-polaritons in CsI and CsBr under hydrostatic pressure

Band-structure parameters and Fermi resonances of exciton-polaritons in CsI and CsBr under hydrostatic pressure

Polarization Dependence of Two-Photon Absorption in Solids

Coupled rate and transport equations modeling proportionality of light yield in high-energy electron tracks: CsI at 295 K and 100 K; CsI:Tl at 295 K

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