Ionized Electron Centers in Alkali Halide Crystals

Schneider, Irwin; Rabin, Herbert

doi:10.1103/physrev.140.a1983

Cited by 50 publications

(8 citation statements)

References 28 publications

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“…The near I R transitions have been already partly studied by Schneider and Rabin [2] and by Schneider and Kabler [3] ; however no published results were so far reported for the near IR emission spectrum.…”

Section: N a R Infrared Transitionsmentioning

confidence: 99%

“…I n 1965, however, Schneider and Rabin [2] identified a near infrared absorption band in three alkali halides (KC1, KBr and KI) unambiguously as the lowest energy transition of the F,+ center. Later Schneider and Kabler [3] observed the luminescence resulting from optical excitation into these bands in KCl …”

Section: Introductionmentioning

confidence: 98%

“…Since Seitz [ 1 3 first proposed a pair of { 110) neighbouring anion vacancies binding an electron as a possible defect structure, this "F$-configuration" was often used as a speculative model to explain different observed optical transitions in alkali halides. I n 1965, however, Schneider and Rabin [2] identified a near infrared absorption band in three alkali halides (KC1, KBr and KI) unambiguously as the lowest energy transition of the F,+ center. Later Schneider and Kabler [3] observed the luminescence resulting from optical excitation into these bands in KCl…”

Section: Introductionmentioning

confidence: 99%

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The F Center in KCl Crystals Part II: Optical Properties and Analogy with the H Molecule

Aegerter

Lüty

1971

Physica Status Solidi (b)

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F$ centers in KCl crystals were so far identified by one absorption band a t 1.4 pm.Several new absorption bands found in the visible and near UV are studied a t LHeT with an almost perfectly aligned system. Energy positions, dichroic behavior and oscillator strengths of these transitions are found in close agreement to the calculated states of the HZ molecule corrected with a single dielectric constant. Excitation of the lowest excited 2pa, state at 1.4 pm leads with e temperature independent quantum efficiency to the I R emission a t 1.07 pm. The experimental band shapes of these I R transitions with their associated zero phonon line were analyzed using a simple model for the electron coupling.Low temperature excitation of all higher absorption states (2%,, etc.) produces a 600 nm luminescence. At higher temperature a thermally activated process transfers the excitation energy to the lowest excited state (2pa3 quenching the 600nm luminescence end producing the I R emission. couplage Blectron phonon. A batme temfirature l'excitation de tous les niveaux sufirieurs (2hX., etc.) produit une luminescence B 600nm. A plus haute temphrature un processus non radiatif transfert 1'6nergie d'excitation sur le niveau excit6 relax4 infbrieur ( 2pa,) "quenchant" la luminescence b 600 nm mais laissent apparaitre 1'6mission IR.

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Section: N a R Infrared Transitionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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The F Center in KCl Crystals Part II: Optical Properties and Analogy with the H Molecule

Aegerter

Lüty

1971

Physica Status Solidi (b)

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“…3 of Ref. 1. The differences in the electric field position of the peaks of the resonance lines can be attributed to the small clamping strain (~4 xl0~5) used in Ref.…”

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confidence: 97%

F3+Center in NaF

Stiles

Fitchen

1966

Phys. Rev. Lett.

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“…For measurements with polarized light a Clan-Thompson prism or a Polaroid foil were used. filter, 8 photodetector, 7 amplifier, 8 recorder (Siemens Oscillomink), 9 wave length indicator, 10motor, 11 spocimen, 12laser…”

Section: Methodsmentioning

confidence: 99%

New Temporary Infrared Absorption Bands in the Alkali Halides

Borms¹,

Jacobs²

1971

Physica Status Solidi (b)

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New temporary infrared absorption bands are observed in several alkali halides. I n NaCl a short-lived centre with a transition at 4 pm is formed by excitation of the electron excess centres at low temperatures. Decay times have been measured simultaneously in the M, F, and 4 pm band. They indicate a bimolecular decay with the same time constant for the three bands. The 4 pm band is attributed to a transition of an electron in a shallow trap. Simultaneous absorption measurements were made in the F, M, and 4 pm band after ruby laser excitation in the F band, and in the F, F , and 4 pm bands after laser excitation in the F band. From these measurements it waa concluded that the shallow trap is the F centre. This implies the existence of a metastable form of the F centre. A triplet state is postulated. Absorption bands analogous to the 4 pm band in NaCl have been observed in KC1 at 6 pm, in NaF a t 2.4 pm, in KBr, and KI.

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Ionized Electron Centers in Alkali Halide Crystals

Cited by 50 publications

References 28 publications

The F Center in KCl Crystals Part II: Optical Properties and Analogy with the H Molecule

The F Center in KCl Crystals Part II: Optical Properties and Analogy with the H Molecule

F3+Center in NaF

New Temporary Infrared Absorption Bands in the Alkali Halides

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