The effect of deposition rate and sample thickness on the luminescence emitted by electron irradiated polycrystalline H2O ice

✍ Scribed by R.A.J. Litjens; T.I. Quickenden; C.G. Freeman; D.F. Sangster

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 625 KB
• Volume: 45
• Category: Article
• ISSN: 0969-806X
• DOI: 10.1016/0969-806x(94)00106-t

✦ Synopsis

The 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 17mmh -~, at various constant sample thicknesses, affected the luminescence intensity, L but did not significantly affect the decay half-life, nor C in the equation 1 = A + B(I --C") for the dependence of light intensity, L on the number of electron pulses, n. Increases in ice thickness from 0.25/tm 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.