The effect of deposition rate and sample thickness on the luminescence emitted by electron irradiated polycrystalline H2O ice
1995; Elsevier BV; Volume: 45; Issue: 5 Linguagem: Inglês
10.1016/0969-806x(94)00106-t
ISSN1879-0895
AutoresR. A. J. Litjens, T. I. Quickenden, C. G. Freeman, David F. Sangster,
Tópico(s)Inorganic Fluorides and Related Compounds
ResumoThe luminescence arising from the excitation by 0.53 MeV electrons of vacuum deposited polycrystalline ice at 77 K, has been studied as a function of deposition rate and ice thickness. Changes in deposition rate from 0.03 to 17 mm h−1, at various constant sample thicknesses, affected the luminescence intensity, I, but did not significantly affect the decay half-life, nor C in the equation I = A + B(1 − Cn) for the dependence of light intensity, I, on the number of electron pulses, n. Increases in ice thickness from 0.25 μm to 5 mm caused: (i) an increase in luminescence intensity to a plateau value at a thickness around 2 mm; (ii) a blue-shift in the spectral maximum from 405 to 385 nm; and (iii) an increase in the decay half-life from 90 to 160 ns.
Referência(s)