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A combined experimental and theoretical study of the photo-physical, laser properties and molecular structures of three relatively recent Pyrromethene (PM) class dyes, PM597, PM580 and PM567, have been carried out. Laser characteristics of these three PM dyes were compared with three other widely used Rhodamine (RH) class dyes, RH6G, RHB and KRS, using a narrow-band dye laser setup, transversely pumped...
Narrow-band laser performance of alcohol solutions of pyrromethene 567 (PM567) and rhodamine 6G (RH6G) dye was investigated using a home-made GIG-configured dye laser, excited by the second-harmonic radiation (at 532 nm) of a pulsed Nd:YAG laser. Higher laser efficiency was observed with PM567 dye (∼23% peak) in comparison to the commonly used RH6G dye (16.5%), in spite of much lower fluorescence...
The transient optical absorption bands (λ max = 310, 350 nm) formed on reaction of OH radicals with 1-bromo-4-iodobutane (pH = 6) are assigned to OH-adduct. In acidic solutions (pH = 3.0), the OH adduct is converted to a transient band with λ max = 440 nm. This band is assigned to intramolecular radical cation formed on p-orbital overlap of oxidized iodine with...
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