期刊
JOURNAL OF CHEMICAL PHYSICS
卷 136, 期 5, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3681258
关键词
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资金
- National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [0969322] Funding Source: National Science Foundation
We use spectral unmixing to determine the number of transient photoproducts and to track their evolution following the photo-excitation of 1,3-cyclohexadiene (CHD) to form 1,3,5-hexatriene (HT) in the gas phase. The ring opening is initiated with a 266 nm ultraviolet laser pulse and probed via fragmentation with a delayed intense infrared 800 nm laser pulse. The ion time-of-flight (TOF) spectra are analyzed with a simplex-based spectral unmixing technique. We find that at least three independent spectra are needed to model the transient TOF spectra. Guided by mathematical and physical constraints, we decompose the transient TOF spectra into three spectra associated with the presence of CHD, CHD+, and HT, and show how these three species appear at different times during the ring opening. (C) 2012 American Institute of Physics. [doi:10.1063/1.3681258]
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