Photoactive High Explosives: Substituents Effects on Tetrazine Photochemistry and Photophysics
| Autor: | Shawn McGrane, Cynthia Bolme, R. J. Scharff, David E. Chavez, Margo T. Greenfield, Susan K. Hanson |
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| Rok vydání: | 2016 |
| Předmět: |
Chemistry
Infrared spectroscopy Quantum yield 02 engineering and technology Nanosecond 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Photobleaching Fluorescence 0104 chemical sciences Photoexcitation Tetrazine chemistry.chemical_compound Irradiation Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | The journal of physical chemistry. A. 120(6) |
| ISSN: | 1520-5215 |
| Popis: | High explosives that are photoactive, i.e., can be initiated with light, offer significant advantages in reduced potential for accidental electrical initiation. We examined a series of structurally related tetrazine based photoactive high explosive materials to detail their photochemical and photophysical properties. Using photobleaching infrared absorption, we determined quantum yields of photochemistry for nanosecond pulsed excitation at 355 and 532 nm. Changes in mass spectrometry during laser irradiation in vacuum measured the evolution of gaseous products. Fluorescence spectra, quantum yields, and lifetimes were measured to observe radiative channels of energy decay that compete with photochemistry. For the 6 materials studied, quantum yields of photochemistry ranged from10(-5) to 0.03 and quantum yield of fluorescence ranged from10(-3) to 0.33. In all cases, the photoexcitation nonradiatively relaxed primarily to heat, appropriate for supporting photothermal initiation processes. The photochemistry observed was dominated by ring scission of the tetrazine, but there was evidence of more extensive multistep reactions as well. |
| Databáze: | OpenAIRE |
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