The Photochemistry of 1,3‐Diphenyltriazene in Various Media. I: Photolysis in Liquid Solutions

Baro, Jürgen; Dudek, D.; Luther, K.; Troe, J.

doi:10.1002/bbpc.19830871214

Cited by 21 publications

(6 citation statements)

References 19 publications

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“…The value of the quantum yield is quite comparable to the quantum yield of the photodecomposition of crystalline diphenyltriazene (DPT), i.e., 6 × 10 -4 , which has the same active chromophore. Further supporting the validity of this comparison, the quantum yield of decomposition of DPT in solution, 10 -3 −2 × 10 -2 , depending on the solvent, matches the range of 1.8 × 10 -3 −1.33 × 10 -2 reported for various aryldialkyl triazenes . The detection of products by the mass spectrometer also strongly supports that material ablation is responsible for the observed craters, as opposed to indentations “written” into the sample surface thermomechanically, by transient elongation of the SNOM tip. , …”

Section: Resultssupporting

confidence: 80%

Nanoscale Atmospheric Pressure Laser Ablation-Mass Spectrometry

et al. 2001

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Section: Resultssupporting

confidence: 80%

Nanoscale Atmospheric Pressure Laser Ablation-Mass Spectrometry

et al. 2001

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“…The value of the quantum yield is quite comparable to the quantum yield of the photodecomposition of crystalline diphenyltriazene (DPT), i.e., 610 4 [391] which has the same active chromophore. Further supporting the validity of this comparison, the quantum yield of decomposition of DPT in solution, 10 3 -210 2 depending on the solvent [392], matches the range of 1.810 3 -1.3310 2 reported for various aryl dialkyl triazenes [140]. Finally, detection of products by the mass spectrometer strongly supports that material ablation is responsible for the observed Fig.…”

Section: Snom Structuringsupporting

confidence: 83%

Laser Application of Polymers

Lippert

2004

Polymers and Light

150

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Laser ablation of polymers has been studied with designed materials to evaluate the mechanism of ablation and the role of photochemically active groups on the ablation process, and to test possible applications of laser ablation and designed polymers. The incorporation of photochemically active groups lowers the threshold of ablation and allows high-quality structuring without contamination and modification of the remaining surface. The decomposition of the active chromophore takes place during the excitation pulse of the laser and gaseous products are ejected with supersonic velocity. Time-of-flight mass spectrometry reveals that a metastable species is among the products, suggesting that excited electronic states are involved in the ablation process. Experiments with a reference material, i.e., polyimide, for which a photothermal ablation mechanism has been suggested, exhibited pronounced differences. These results strongly suggest that, in case of designed polymers which contain photochemically active groups, a photochemical part in the ablation mechanism cannot be neglected. Various potential applications for laser ablation and the special photopolymers were evaluated and it became clear that the potential of laser ablation and specially designed material is in the field of microstructuring. Laser ablation can be used to fabricate three-dimensional elements, e.g., microoptical elements.Keywords Laser ablation · Ablation mechanism · Photopolymers · Polyimide · Spectroscopy This was not always true, of course. For many years, the laser was viewed as "an answer in search of a question". That is, it was seen as an elegant device, but one with no real useful application outside of fundamental scientific research. In the last two to three decades however, numerous laser applications have moved from the laboratory to the industrial workplace or the commercial market. Lasers are unique energy sources characterized by their spectral purity, spatial and temporal coherence, and high average peak intensity. Each of these characteristics has led to applications that take advantage of these qualities: -Spatial coherence: e.g., remote sensing, range finding and many holographic techniques. -Spectral purity: e.g., atmospheric monitoring based on high-resolution spectroscopies. -and of course the many other applications in communication and storage, e.g., CDs.All of these high-tech applications have come to define everyday life in the late twentieth century. One property of lasers, however, that of high intensity, did not immediately lead to "delicate" applications but rather to those requiring "brute force". That is, the laser was used in applications for removing material or heating. The first realistic applications involved cutting, drilling, and welding, and the laser was little more advanced than a saw, a drill, or a torch. In a humorous vein A.L. Schawlow proposed and demonstrated the first "laser eraser" in 1965 [4], using the different absorptivities of paper and ink to remove the ink without damaging the und...

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“…Figure 2. Absorption spectrum of l-(4-nitrophenyl)-3,3-diethyltriazene (19). The experimental spectrum (solid line) is compared with the transition energies and oscillator strengths calculated using the AMI parametrization (stick spectrum, upper diagram) and using the PM3 parametrization (stick spectrum, lower diagram).…”

Section: Discussionmentioning

confidence: 99%