Relaxation of the conductivity of CsI-Tl after excitation by subnanosecond electron pulses |
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Authors: | B P Aduev V N Shvaiko |
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Institution: | (1) Kemerovo State University, 650043 Kemerovo, Russia |
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Abstract: | The pulsed conductivity is investigated for a CsI-Tl crystal having a Tl+ concentration N=8×1017cm−3 and excited by an electron beam (0.2 MeV, 50 ps, 102–104
A/cm
2). It is shown that the amplitude of the conduction current pulse is almost an order of magnitude lower than for “pure” CsI
crystals irradiated under like conditions. The conduction current relaxation time is preserved up to τ=100 ps in this case. Under the experimental conditions, therefore, the lifetime of electrons in the conduction band is controlled
by trapping at Tl+ centers. The electron capture cross section at a Tl+ center is determined: σ=7×10−16 cm2, which agrees in order of magnitude with estimates of the capture cross section for a neutral trapping center.
Fiz. Tverd. Tela (St. Petersburg) 40, 66–67 (January 1998) |
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