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Photochemically induced oscillations of aromatic pentazadienes

Abstract

Aromatic pentazadienes are used to enhance the laser induced ablation of standard polymers with low absorption in the UV. Therefore the photochemistry of substituted 1,5-diaryl-3-alkyl-1,4-pentazadiene monomers was studied with a pulsed excimer laser as irradiation source. The net photochemical reaction proceeds in an overall one-step pathway A{yields}B. Quantum yields for the laser decomposition were determined to be up to 10%. An oscillating behaviour of the absorption was found during the dark period following the irradiation. The temperature dependence of this dark reaction has been studied. An attempt to model this behaviour in terms of a non-linear coupling between heat released, heat transfer, and reaction kinetics will be described. (author) 4 figs., 4 refs.
Authors:
Kunz, T; Hahn, C; Wokaun, A [1] 
  1. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
Publication Date:
Jun 01, 1997
Product Type:
Miscellaneous
Report Number:
ETDE/CH-mf-97750556
Reference Number:
SCA: 400500; PA: CH-97:0E0206; EDB-97:092683; SN: 97001800477
Resource Relation:
Other Information: PBD: 1997; Related Information: Is Part Of Paul Scherrer Institut annual report 1996. Annex V: PSI general energy technology newsletter 1996; Daum, C.; Leuenberger, J. [eds.]; PB: 125 p.
Subject:
40 CHEMISTRY; AZO COMPOUNDS; PHOTOCHEMISTRY; DECOMPOSITION; IRRADIATION; EXCIMER LASERS; ABSORPTION; TEMPERATURE DEPENDENCE; MATHEMATICAL MODELS; THEORETICAL DATA; EXPERIMENTAL DATA
OSTI ID:
492038
Country of Origin:
Switzerland
Language:
English
Other Identifying Numbers:
Other: ON: DE97750556; TRN: CH97E0206
Availability:
OSTI as DE97750556
Submitting Site:
CH
Size:
pp. 41-42
Announcement Date:

Citation Formats

Kunz, T, Hahn, C, and Wokaun, A. Photochemically induced oscillations of aromatic pentazadienes. Switzerland: N. p., 1997. Web.
Kunz, T, Hahn, C, & Wokaun, A. Photochemically induced oscillations of aromatic pentazadienes. Switzerland.
Kunz, T, Hahn, C, and Wokaun, A. 1997. "Photochemically induced oscillations of aromatic pentazadienes." Switzerland.
@misc{etde_492038,
title = {Photochemically induced oscillations of aromatic pentazadienes}
author = {Kunz, T, Hahn, C, and Wokaun, A}
abstractNote = {Aromatic pentazadienes are used to enhance the laser induced ablation of standard polymers with low absorption in the UV. Therefore the photochemistry of substituted 1,5-diaryl-3-alkyl-1,4-pentazadiene monomers was studied with a pulsed excimer laser as irradiation source. The net photochemical reaction proceeds in an overall one-step pathway A{yields}B. Quantum yields for the laser decomposition were determined to be up to 10%. An oscillating behaviour of the absorption was found during the dark period following the irradiation. The temperature dependence of this dark reaction has been studied. An attempt to model this behaviour in terms of a non-linear coupling between heat released, heat transfer, and reaction kinetics will be described. (author) 4 figs., 4 refs.}
place = {Switzerland}
year = {1997}
month = {Jun}
}