TITLE

On the nature of photo charge carriers in ice

AUTHOR(S)
Petrenko, V. F.; Khusnatdinov, N. N.
PUB. DATE
June 1994
SOURCE
Journal of Chemical Physics;6/15/1994, Vol. 100 Issue 12, p9096
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A method of photoelectromotive force (PEMF) was developed to find the charge sign, mobility, and lifetime of photo charge carriers in ice generated by photons with energy hν>=6.5 eV. It was determined that the most mobile photo charge carriers are negative ones, with mobility μ increasing from 2×10-3 cm2/V s at T=-10 °C to 4×10-2 cm2/V s at T=-30 °C, and with their lifetime decreasing from 30 to 10 s in the same temperature range. Activation energies of the mobility and the lifetime are Eμ=-0.77 eV and Eτ=0.32 eV, respectively. In addition to the negative photo charge carriers positive ones arise with mobility μ=2.3×10-4 cm2/V s and lifetime τ=26 min at T=-15 °C. We suggest that the negative photo charge carriers in ice are mobile complexes of an electron, vacancy and D-defect (e-+V+D). To take into account a specific mechanism of charge transport in ice, configurational vector Ω, and the generation of complexes (e-+V+D), a reaction of ‘‘autoionization’’ was modified for ice, 2H2O+hν→H3O++OH•int(e-+V+D).
ACCESSION #
7641784

 

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