Optical Investigation of Atomic Hydrogen Centres in Alkali Chlorides Doped with I<sup>−</sup> or Br<sup>−</sup>

Lohse, F.; Reuter, G.; Spaeth, J.‐M.

doi:10.1002/pssb.2220890113

Cited by 13 publications

(11 citation statements)

References 14 publications

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“…3). I n KCI both bands coincide exactly in energy and seem to be one simple band with v = 2.5 x lo1, s-l from the temperature shift that this band is coniposed of the two transitions I, and I; [17]. Excitation in the C1 bands leads always to negative p-values.…”

Section: Emission Spectramentioning

confidence: 87%

“…centres are due to charge transfer transitions where halogen p-electrons are transferred to H: forming a H i ion and a hole in the halogen band. I n the case of HY (1) The energy separation between the red and blue emission is within error the same as between the I, and I, absorption bands a t low temperature, and thus also largely determined by the iodine spin-orbit coupling constant (+A for free I 0 is 0.944 eV) [17].…”

Section: Discussionmentioning

confidence: 99%

“…The degree of polarization p = (111 -IL)/(I1l + 11) of that this band is coniposed of the two transitions I, and I; [17]. Excitation in the C1 bands leads always to negative p-values.…”

Section: Polarization Of the Emissionmentioning

confidence: 98%

“…1). This is known from the ESR [16], the optical absorption, and MCD measurements [17]. Upon excitation of He(1) centres one obtains mainly fluorescence emission and hardly decay processes.…”

Section: Introductionmentioning

confidence: 99%

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Fluorescence of Interstitial Atomic Hydrogen in Alkali Halides Doped with I⁻

Lohse

Spaeth

1979

Physica Status Solidi (b)

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and RbCl doped with I-interstitial atomic hydrogen shows fluorescence emission if one of the four chlorine neighbours is replaced by an I-. I n KCl one emission band at 2.84 eV with a radiative decay time of 14 ns and two overlapping bands at 1.97 eV with decay times of 34 ns and 720 ns (at 4 K) are observed. Similar results are found for RbCI. The results are interpreted as due to two charge transfer type relaxed excited states, one of which is a spin quartet and responsible for the long radiative lifetime.I n mit I-dotiertem KCI and RbCl zeigt atomarer Wasserstoff auf Znischengitterplatz dann eine Fluoreszenzemission, wenn einer der vier Chlornachbarn durch ein I-ersetzt ist. I n KCI werden eine Emissionsbande bei 2,84 eV mit einer Abklingdauer von 14 ns und zwei sich uberlagernde Banden bei 1,97 eV mit Abklingdauern von 34 ns bzw. 720 ns (bei 4 K) beobachtet. Die Interpretation fuhrt auf zwei relaxierte. angeregte Charge-Transfer-Zustande, von denen einer als SpinQuartett fur die lange Lebensdauer verantwortlich ist.

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Section: Emission Spectramentioning

confidence: 87%

Section: Discussionmentioning

confidence: 99%

“…The degree of polarization p = (111 -IL)/(I1l + 11) of that this band is coniposed of the two transitions I, and I; [17]. Excitation in the C1 bands leads always to negative p-values.…”

Section: Polarization Of the Emissionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Fluorescence of Interstitial Atomic Hydrogen in Alkali Halides Doped with I⁻

Lohse

Spaeth

1979

Physica Status Solidi (b)

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“…The Czochralski grown KC1 crystals were doped in the melt with about 2 x ppm OH-and 2 to 10 x 10-2 ppm Br-for HP centres in a mixed configuration with one Br-and three C1-as nearest halogen neighbours [12].…”

Section: Methodsmentioning

confidence: 99%

Generation of dichroic h centres in KCl by polarized optical bleaching of interstitial atomic hydrogen

Reuter

Lohse

Spaeth

1979

Physica Status Solidi (b)

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Upon optical bleaching of interstitial atomic hydrogen (Hp or U, centres) with polarized light U andH centres (H; and (21% , ) are produced, the latter in an unbalanced distribution which is measured by optical absorption and ESR. Similar results are obtained for bleaching of U, centres in a mixed configuration with one Br-as nearest neighbour (HP(Br)). I n the H centre formation Cl0 is ejected to form a C1, crowdion only into those [110]

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The inelastic light scattering of the localized vibration of the interstitial hydrogen atom in the alkali halides

Goovaerts

Schepper

Bouwen

et al. 1980

Phys. Stat. Sol. (a)

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The Raman spectrum of the interstitial hydrogen atom (H i0) centre, also called U2 centre, is measured in a series of eight alkali halides. The vibration of the hydrogen atom gives rise to a single narrow line in the spectrum, with a frequency shift, ωH, ranging from 237 cm−1 in RbI to 523 cm−1 in NaCl. This vibrational mode possesses the T2 symmetry of the tetrahedral group as confirmed by measurements of the scattered light in different polarization geometries. In OD‐ doped crystals of KBr and KI the localized mode frequency, ωD, of the analogous deuterium (D i0) centre is measured, and it is found to obey the relation \documentclass{article}\pagestyle{empty}\begin{document}$ \omega _{\rm H} /\omega _{\rm D} = \sqrt 2 $\end{document}. This proves the involvement of the hydrogen atom in the vibrational mode, and shows that this vibration is not strongly coupled to the phonons. A “soft sphere” potential calculation of the vibrational frequency of the H i0 centre is presented, which uses parameters taken from the literature. The results of this first calculation are in bad agreement with the experiments. Possible improvements of the model are discussed: The distorsion of the crystal lattice near the H i0 centre is estimated from ENDOR data and taken into account in the further calculation. Finally, the parameters of the “soft sphere” potential between the hydrogen atom and the nearest neighbour halogen ions are readjusted in order to fit the measured vibrational frequencies of the H i0 centres.

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Optical Investigation of Atomic Hydrogen Centres in Alkali Chlorides Doped with I⁻ or Br⁻

Cited by 13 publications

References 14 publications

Fluorescence of Interstitial Atomic Hydrogen in Alkali Halides Doped with I⁻

Fluorescence of Interstitial Atomic Hydrogen in Alkali Halides Doped with I⁻

Generation of dichroic h centres in KCl by polarized optical bleaching of interstitial atomic hydrogen

The inelastic light scattering of the localized vibration of the interstitial hydrogen atom in the alkali halides

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Optical Investigation of Atomic Hydrogen Centres in Alkali Chlorides Doped with I− or Br−

Cited by 13 publications

References 14 publications

Fluorescence of Interstitial Atomic Hydrogen in Alkali Halides Doped with I−

Fluorescence of Interstitial Atomic Hydrogen in Alkali Halides Doped with I−

Generation of dichroic h centres in KCl by polarized optical bleaching of interstitial atomic hydrogen

The inelastic light scattering of the localized vibration of the interstitial hydrogen atom in the alkali halides

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Optical Investigation of Atomic Hydrogen Centres in Alkali Chlorides Doped with I⁻ or Br⁻

Fluorescence of Interstitial Atomic Hydrogen in Alkali Halides Doped with I⁻

Fluorescence of Interstitial Atomic Hydrogen in Alkali Halides Doped with I⁻