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Title: Theoretical approach to lyoluminescence of organic materials
Authors: Chandra, B P
Gour, Anubha S
Chandra, Vivek K
Baghel, D S
Khare, P K
Keywords: Aqualuminescence;Lyolumincscence;Organic materials;Radicals
Issue Date: Nov-2003
Publisher: NISCAIR-CSIR, India
Abstract: Considering the mechanism of lyoluminescence (LL) in organic materials, an expression is derived for LL intensity, which indicates that , when the organic material is dissolved into the solution, then, initially, the LL intensity should increase linearly with time, attain a peak value and then it should decrease exponentially with time. Expressions are also derived for the time tm at which, the LL corresponding to the time tm and for the total LL intensity IT. From the decay of LL intensity, the value of the rate constant σ for the decay of alkyl radical concentration is determined and it is found to be 0.49 and 1.72 sec-1 for sachharide and mannose. These values give that, the decay time of alkyl radical concentration should be 2.04 and 0.87 sec for saccharide and mannose. From the values of tm and σ, the value of the rate constant (Ɛ+λ) for the decay of peroxy radical concentration is determined and it is found to be 1.0 and 2.3 sec-1 for saccharide and mannose respectively. These values of rate was constant which indicates that, decay-time of peroxyradical concentration should be 0.62 and 0.43 sec for saccharide and mannose respectively. A good agreement is to und between the theoretical and experimental results.
Page(s): 884-893
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.41(11) [November 2003]

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