Ultraviolet reflection and absorption of KH2PO4 and NH4H2PO4 crystals

Baldini, Giancarlo; Cottini, Milvia; Grilli, E.

doi:10.1016/0038-1098(72)90837-x

Cited by 20 publications

(11 citation statements)

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“…The main features of the obtained absorption and reflection spectra at the atmospheric pressure (p ≈ 1 bar) are in agreement with the experimental data [13,17] (see figure 8). A wide absorption band at energies 8.5−10.0 eV corresponds to the A band in the experiment, while the absorption bands at 10.5−11.2 eV and 11.8− 12.7 eV correspond to the B and C bands, respectively.…”

Section: Optical Propertiessupporting

confidence: 89%

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Band Electron Spectrum and Optical Properties of KDP-Crystals Under the External Hydrostatic Pressure

Stetsiv¹

1999

Condens. Matter Phys.

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The electron spectrum of the KDP-type crystals has been investigated as a function of the external hydrostatic pressure using the tight-binding approximation. The joint density of electron states, real and imaginary parts of the dielectric permeability, refraction indices, the gyration coefficient, absorption and reflection coefficients for different polarizations of light are determined. Their pressure and frequency dependencies are investigated. The results are discussed by comparing them with the experimental data on piezooptic coefficients. The anomalous behaviour of the optical constants at the pressure p ≃ 17 kbar is due to the transformation of the hydrogen bond potential from a double minimum one to a single minimum one, where the proton is localised at the midpoint of the hydrogen bond.

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Section: Optical Propertiessupporting

confidence: 89%

“…The bands from (1) up to (24) are filled in the ground state. The obtained energy gap is 6.17 eV, which is somewhat less than the experimental results: 7.0 eV [17], 7.62 eV [18].…”

Section: )mentioning

confidence: 67%

Band Electron Spectrum and Optical Properties of KDP-Crystals Under the External Hydrostatic Pressure

Stetsiv¹

1999

Condens. Matter Phys.

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“…The low energy falloff of the excitation spectrum of the fast component (time window t 1 ) coincides with the low energy tail of FA of ADP and the excitation has highest efficiency at h = 7.3 eV. The optical absorption coefficient of ADP at this energy is about 2000 cm −1 (Baldini et al, 1972). With a further increase in h to 9.3 eV, the efficiency of excitation of the 4.7 eV PL band decreases by more than a factor of 10, remaining at this level up to h =22 eV.…”

Section: Resultsmentioning

confidence: 67%

“…The electronic transition with the lowest energy in the H 2 PO 4 group is due to the transfer of an electron between these levels. Baldini et al (1972) and Saito et al (1974) suggested an excitonic origin of the low energy tail of the FA band of ADP and KDP. Lowtemperature experiments revealed self-trapping of holes with formation of [H 2 PO 4 ] 0 -radicals (so-called B-radicals) in ADP and KDP crystals (Diéguez et al, 1984;Stevens et al, 1999).…”

Section: Resultsmentioning

confidence: 99%

“…The low energy tails of fundamental absorption (FA) of KDP and ADP are located at 180 nm in the vacuum ultraviolet (VUV) spectral range. Therefore, despite the long-term investigations and wide practical application of KDP and ADP, only a few works are known (Baldini et al, 1972;Saito et al, 1974) in which these materials were studied by the means of the optical VUV spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

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Luminescence of the hydrogen bonded crystals

Огородников¹,

Kirm

Пустоваров³

2007

Radiation Measurements

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A complex investigation of the dynamics of electronic excitations in the hydrogen bonded crystals of potassium and ammonium dihydrophosphates-KH 2 PO 4 (KDP) and NH 4 H 2 PO 4 (ADP)-is performed by the means of the low-temperature time-resolved vacuum ultraviolet (VUV) optical luminescence spectroscopy with subnanosecond time resolution and with selective photoexcitation by synchrotron radiation. For KDP and ADP crystals, data on the kinetics of the photoluminescence (PL) decay, the time-resolved PL spectra (2-6.2 eV), and the time-resolved excitation PL spectra (4-24 eV) at 8 K were obtained. The intrinsic character of the PL of KDP (5.2 eV) and ADP (4.7 eV), which is caused by the radiative annihilation of self-trapped excitons (STEs), is ascertained. Possible channels of generation and decay of relaxed and unrelaxed electronic excitations in KDP and ADP crystals are discussed.

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Dispersion of the faraday rotation in KDP-type crystals by pulse high magnetic field

Koralewski

1981

Phys. Stat. Sol. (a)

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Ultraviolet reflection and absorption of KH2PO4 and NH4H2PO4 crystals

Cited by 20 publications

References 1 publication

Band Electron Spectrum and Optical Properties of KDP-Crystals Under the External Hydrostatic Pressure

Band Electron Spectrum and Optical Properties of KDP-Crystals Under the External Hydrostatic Pressure

Luminescence of the hydrogen bonded crystals

Dispersion of the faraday rotation in KDP-type crystals by pulse high magnetic field

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