Picosecond configuration relaxation in the1 T 1u -state of Ag?-centers in KI

Nikolaus, B.; Schmitt, K. T.

doi:10.1007/bf00704577

Cited by 7 publications

(1 citation statement)

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“…Though we do not know the value of zc in KBr:Ag-, we can substitute the value for K1:Ag-, tc = 1.1 ns [22]. Using this value and or1 = (1.1 to 1.9) x lo6, we have 5, A correction for the emission yield ratio after the consideration of the transition probabilities among the TI, 3P0, and lS, states [7,12] is omitted here.…”

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confidence: 99%

Radiative and Non‐Radiative Processes of Localized Impurity Centers in Alkali Halides: KBr:Ag⁻

Shimanuki

1988

Physica Status Solidi (b)

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The C and A emissions in KBr:Ag-are measured in detail between 11.2 and 300 K. At 11.2 K, excitation in the peak position of the C band exhibits the C emission but it hardly produces A emission. Changing the excitation position to the higher energy side of the C band peak, the A emission is produced a little. The intensity (emitted photon number) ratio of the A to C emission, r), shows an excitation photon-energy dependence and changes over three orders within both sides of the C band. Increasing the temperature, q itself increases as a whole and its excitation photonenergy dependence weakens and disappears a t about 80 K. The values of q in the lower energy edge show an activation process of Arrhenius type over four orders above around 45 K, whose activation energy is 0.076 eV, and below 30 K, another activation process of the same type with an activation energy of 0.0025 eV. A few causes of the exciting energy dependence of r) a t low temperatures are considered and the mechanism due to the dynamical nonradiative transition is proposed.Les Bmissions C et A dans KBr:Ag-ont 6tk mesurkes en detail entre 11,2 et 300 K. A 11,2 K, l'excitation en position de la pointe expose 1'6mission C, mais elle n'expose pas 1'Bmission A B peine. Changeant la position d'excitation vers le cBtB des Bnergies plus hautes, 1'6mission A est aussi produit un peu. Au bout du compte, la proportion d'intensitbs de 1'Bmission A de 1'6mission C, r) montre une dependance de photon-Bnergie d'excitation et se change sur trois ordres dans la region de la bande C. ElBvant la tempbrature, q croit dans toute la rbgion de la bande C, mais cette

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Section: =mentioning

confidence: 99%