title: Fluctuations in absorbance observed for photoexcited ferrocene-doped poly(methyl methacrylate) thin films containing chloroform molecules as impurities.
abstract: The time-dependent changes in absorbance in the case of ferrocene-doped poly(methyl methacrylate) thin films containing chloroform molecules have been investigated after photoexcitation in nitrogen atmosphere. Photoexcitations have been made by the monochromatic light (using Xe-source and a monochromator) in the UV range. An increase in absorbance associated with spectacular fluctuations in its value, has been noticed. The nature of the variation in the fluctuations has been studied as a function of time (duration) of photoexcitation, photoexcitation wavelength and concentration of ferrocene in the film. The observed results have been discussed considering the role of secondary reaction after photoexcitation as well as the diffusion of small chemical species in the polymer matrix.
authors.affiliation: Department of Spectroscopy, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India.
authors.forename: Biswanath
authors.initials: B
authors.lastname: Mallik
authors.forename: Alfazuddin
authors.initials: A
authors.lastname: Thander
authors.forename: Manik Kumar
authors.initials: MK
authors.lastname: Sanyal
mesh_terms: D002725:Chloroform / Q000737:chemistry*; D005296:Ferrous Compounds / Q000737:chemistry*; D000075163:Metallocenes; D020366:Methylmethacrylate / Q000737:chemistry*; D009584:Nitrogen / Q000737:chemistry*; D011108:Polymers; D013053:Spectrophotometry
chemical_list: D005296:Ferrous Compounds; D000075163:Metallocenes; D011108:Polymers; D020366:Methylmethacrylate; D002725:Chloroform; D009584:Nitrogen; C004998:ferrocene