Damped Oscillations in UV−Vis Spectra of Pentazadiene Monomers and Polymers after Laser Photolysis

Autor:	Ch. Hahn, Th. Lippert, Th. Kunz, A. Wokaun, O. Nuyken, A. Baindl, F. Gassmann
Rok vydání:	1999
Předmět:	chemistry.chemical_classification Excimer laser medicine.medical_treatment Polymer Photochemistry Laser Spectral line law.invention Ultraviolet visible spectroscopy chemistry law medicine Irradiation Physical and Theoretical Chemistry Spectroscopy Absorption (electromagnetic radiation)
Zdroj:	The Journal of Physical Chemistry A. 103:4855-4860
ISSN:	1520-5215 1089-5639
DOI:	10.1021/jp983231p
Popis:	The photochemical decomposition of substituted 1,5-diaryl-3-alkyl-pentazadiene monomers and polymers induced by UV irradiation with a pulsed excimer laser was monitored by UV-vis spectroscopy. The net photochemical reaction proceeds in an overall one-step pathway AfB. Quantum yields for the laser decomposition are determined to be e10%. An oscillating behavior of the absorption was found during the dark period following the irradiation. The temperature dependence of this dark reaction has been studied. The oscillatory behavior is discussed in the light of current theories concerning instabilities in photochemical systems.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::594eb60a7012c8e354d1ea86c5b0a906 https://doi.org/10.1021/jp983231p Zobrazit plný text záznamu