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- W1980250787 abstract "By EPR experiments is shown that two charge states of chromium impurity are present in CdTe:Cr. The Cr2+(d4) state has an acceptor character and can accept an additional electron into the d-shell. The energy required to change the charge state of Cr2+(d4) into Cr1+(d5) by transferring one electron from the valence band is about 1.2 to 1.3 eV. The photosensitive EPR spectrum due to Cr1+(d5) shows that the observed intense exponential absorption tail is due to this charge transfer process. The shape of the exponential tail is also investigated. It is suggested that the exponential character of the absorption tail is due to the presence of a Jahn-Teller effect in the ground state of Cr2+(d4). Durch EPR-Experimente wird gezeigt, daß in CdTe: Cr zwei Ladungszustände von Chromstörstellen vorhanden sind. Der Cr2+(d4)-Zustand hat Akzeptorcharakter und kann ein zusätzliches Elektron in die d-Schnle einbauen. Die für die Ladungsänderung des Cr2+ (d4)-Zustands in Cr1+ (d5) benötigte Energie durch Transfer eines Elektrons aus dem Valenzband beträgt etwa 1,2 bis 1,3 eV. Das photoempfindliche EPR-Spektrum, das auf Cr1+ (d5) zurückzuführen ist, zeigt, daß die beobachteten intensiven exponentiellen Absorptionsausläufer durch diesen Charge-Transfer-Prozeß hervorgerufen werden. Es wird angenommen, daß der exponentielle Charakter des Absorptionsausläufers auf einen Jahn-Teller-Effekt des Grundzustands von Cr2+ (d4) beruht." @default.
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- W1980250787 date "1975-07-01" @default.
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- W1980250787 title "Optical Charge Transfer Spectra and EPR Spectra of Cr2+(d4) and Cr1+ (d5) in CdTe" @default.
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- W1980250787 doi "https://doi.org/10.1002/pssb.2220700133" @default.
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