74488-01-0Relevant academic research and scientific papers
Photochemistry of Diacetylene
Glicker, S.,Okabe, H.
, p. 437 - 440 (1987)
Adsorption coefficients of C4H2 have been measured in the 183-260-nm wavelength region.The photochemistry of diacetylene has been studied at 147.0, 184.9, 228.8, and 253.7 nm.The primary dissociative processes at 147 nm, deduced from the photolysis of C4H2 and D2 mixtures, are, in order of decreasing importance, C4H2 + hν -> C4H + H, C4H2 + hν -> C2H2 + C2, and C4H2 + hν -> 2C2H with quantum yields of 0.2, 0.1, and 0.03, respectively.In addition, the quantum yields of products and of reactant disappearance were measured in neat C4H2 and C4H2 and N2 mixtures.It is concuded that (1) reactions involving metastable excited states, C4H2** + C4H2 -> C8H2 + H2, are the main disappearance processes at three other wavelengths and (2) the C4H2** sates are stable toward collisions with N2.The excited-state reactions may be the predominant photochemical processes of C4H2 in Titan's stratosphere.
An Experimental Study of the Reactions of OH Radicals with 1,3-Butadiyne, Propyne, 1-Butyne and 2-Butyne in the Gas Phase
Bartels, M.,Heinemann-Fiedler, P.,Hoyermann, K.
, p. 189 - 208 (2007/10/02)
The reactions of OH/OD radicals with butadiyne, propyne, 1-butyne and 2-butyne have been studied at low temperature (295 K) in low pressure reactors (0.1-15 mbar).Samples were withdrawn continuously by a molecular beam device and analyzed by a mass spectrometer.The detection sensitivity was enhanced by modulation techniques and single ion counting.The primary reaction products are described mainly by an addition mechanism.For the reaction of butadiyne with OH radicals the mechanism and a rate constant of 1.2(+/-0.6)E13 cm3/mol s were found.The reactions of the adduct with the alkynes were found to be very fast.Complementary studies of the reactions of H/D + C4H2 and F + C4H2 are reported. - Keywords: Chemical kinetics / Elentary reactions / Mass spectrometry
