Temperature dependence of the electron drift mobility in doped and undoped amorphous silicon.
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Journal Article↗
Biomedical subjects
N Periasamy
Publications and source records attributed to N Periasamy.
On the origin of heterogeneity of fluorescence decay kinetics of reduced nicotinamide adenine dinucleotide.
The fluorescence lifetimes of reduced nicotinamide adenine dinucleotide and other dihydronicotinamide derivatives were measured by picosecond laser excited time correlated single photon counting technique. All the dihydronicotinamide derivatives (including the simple model compound N-methyl-nicotinamide) had fluorescence decay profiles which could be fitted to double and triple exponentials in neutral aqueous solutions and in dimethyl sulfoxide respectively. It was concluded that the heterogeneity in the measured lifetimes arises from the inherent photoprocess of the dihydronicotinamide chromophore and not due to any intramolecular interaction as assumed in earlier studies. Some of the possible schemes for the fluorescence decay are discussed.
Dimethyl Sulfoxide↗
Photoprocesses in covalently linked pyrochlorophyllide dimer: Triplet state formation and opening and closing of hydroxylic linkages.
Covalently linked pyrochlorophyllide a dimers exist in solution in either "pinned" or unfolded form, depending on the concentration of hydroxylic (H bonding) or non-H-bonding Lewis bases. Laser flash photolysis studies have been made on these dimer forms and on pyrochlorophyllide monomer at 30-nsec resolution. Spectra and recovery kinetics, including observation of both the triplet decay and ground state folding reactions, show that the flash transient obtained from the pinned form consists of a triplet and ground state moiety in the unpinned configuration. A charge-transfer excited state is not seen.
Journal Article↗