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Association reactions by femtosecond laser filamentation in gaseous C 2 H 4 were studied by time-of-flight mass spectrometry of neutral reaction products. Direct sampling from the reaction cell to a mass spectrometer via a differential pumping stage allowed the identification of various hydrocarbon molecules C  n  H  m  with n = 3-7 and m = 4-7, which includes species not observed in the previous studies. It was found that products containing three and four carbon atoms dominate the mass spectrum with smaller yields for higher-mass species, suggesting that carbon chain growth proceeds through the reaction with C 2 H 4 in the reaction cell. The product distribution showed a clear dependence on the laser pulse energy for filamentation.

Association Reaction of Gaseous C2H4 in Femtosecond Laser Filaments Studied by Time-of-Flight Mass Spectrometry

Association Reaction of Gaseous C₂H₄ in Femtosecond Laser Filaments Studied by Time-of-Flight Mass Spectrometry