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- W2040998287 abstract "Im Bereich der Singulett-Absorption verläuft das Photostromspektrum nicht immer im gleichen Sinn wie das Absorptionsspektrum, sondern oft im Gegensinn; ferner tritt ein vorgelagertes Maximum bei 415 bis 430 nm auf. Der Typus des Photostromspektrums wird bestimmt durch die Reinheit der Kristalle, die Injektionsfähigkeit der Anode, die angelegte Spannung und die Bestrahlungsstärke. Der qualitativen Deutung der Meßergebnisse werden Trägererzeugung an der Oberfläche durch Singulettexzitonen und Trägerbefreiung im Inneren durch Triplettexzitonen als konkurrierende Prozesse zugrunde gelegt. — Die Lage des vorgelagerten Maximums läßt sich unter Berücksichtigung der inhomogenen Lichtverteilung im Kristall berechnen. Im Gebiet starker Absorption überwiegt die Trägerbefreiung durch Triplettexzitonen, die durch reabsorbiertes Fluoreszenzlicht erzeugt werden. In the spectral region of singlet absorption, the action spectrum of the photocurrent does not always resemble the absorption spectrum but often has an inverse structure with an additional long wavelength peak between 415 and 430 nm. The type of photocurrent spectrum was found to depend upon crystal purity, injection capability of the anode, applied voltage, and light intensity. A qualitative interpretation is presented in terms of two competitive processes: generation of carriers at the surface via singlet excitons, and detrapping in the bulk mainly by triplet excitons. The position of the additional peak was calculated taking into account the ununiform light distribution in the crystal. In the region of strong absorption, reabsorbed fluorescence light plays a predominant role in the detrapping process by triplet excitons." @default.
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- W2040998287 date "1969-01-01" @default.
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- W2040998287 title "Anregungsspektren stationärer Photoströme in Anthrazen-Kristallen im Bereich der Singulett-Absorption" @default.
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