2143-69-3Relevant academic research and scientific papers
Photodissociation of Vinyl Chloride: Formation and Kinetics of Vinylidene H2CC(3B2)
Fahr, Askar,Laufer, Allan H.
, p. 2906 - 2909 (1985)
The primary photodissociation processes in the photolysis of vinyl chloride have been investigated by using the flash photolysis-kinetic spectroscopic technique.Concentrations and temporal profiles of product H2CC(3B2), HCl, and C2H2 are monitored by their absorption in the vacuum ultraviolet at 137, 139, and 151 nm, respectively.HCl and H2CC(3B2) are formed with the same time history via a 1,1 elimination from excited C2H3Cl.Rate constants for the interaction of H2CC(3B2) with He, 1.07 +/= 0.17E-14 cm3 molecule-1 s-1, and C2H3Cl, 3.5E-11 cm3 molecule-1 s-1, have been obtained.
Photodissociation of ethylene at 193 nm
Balko, B. A.,Zhang, J.,Lee, Y. T.
, p. 935 - 942 (1992)
The photodissociation of ethylene at 193 nm was studied by measuring the product translational energy distributions for the H + C2H3 and H2 + C2H2 channels.In agreement with previous workers, it was determined that atomic and molecular elimination occur in relatively equal amounts.Using 1,1 D2CCH2 and 1,2 cis HDCCDH, it was shown that both acetylene and vinylidene are formed and that the acetylene/vinylidene ratio is approximately 2/3 in the molecular elimination.This H2 elimination channel has a translational energy distribution peaked at around 20 kcal/mol, indicating that it is a concerted process with a substantial exit barrier.It was found that the H atom elimination channel is best described as a simple bond rupture occurring after internal conversion of the electronically excited molecule to the vibrationally excited ground state ethylene.Some of the primary C2H3 product has sufficient internal energy to spontaneously decompose to H + HCCH.At higher laser intensity a large fraction of the C2H3, however, absorbs another photon and fragments to H + H2C=C: (1A1 and 3B2).
193 nm photolysis of vinyl bromide: Nascent product distribution of the C2H3Br→C2H2 (vinylidene)+HBr channel
Liu,Letendre,Dai
, p. 1734 - 1741 (2001)
The internal energy content of fragment HBr and C2H2 following photolysis of the precursor, vinyl bromide, at 193 nm was determined using time-resolved Fourier transform spectroscopy (TR FTS). Data taken 1 μs after the laser photolys
Site-specific dissociation dynamics of ethylene at 157 nm: atomic and molecular hydrogen elimination
Lin, Jim J.,Wang, Chia C.,Lee, Yuan T.,Yang, Xueming
, p. 9668 - 9677 (2000)
Photodissociation of five ethylene isotopomers at 157 nm was studied using a molecular beam apparatus. From this study, complete and interesting information on the site and isotope effects on the molecular hydrogen elimination processes from ethylene were also detected. Using the new improved experimental technique, dynamical differences between different microchannels of molecular hydrogen elimination processes from ethylene were also detected. Site and isotopic effects on the molecular hydrogen elimination processes were also clearly observed.
Photodissociation of acrylonitrile at 193 nm: A photofragment translational spectroscopy study using synchrotron radiation for product photoionization
Blank, David A.,Suits, Arthur G.,Lee, Yuan T.,North, Simon W.,Hall, Gregory E.
, p. 5784 - 5794 (2007/10/03)
We have investigated the photodissociation of acrylonitrile (H2CCHCN) at 193 nm using the technique of photofragment translational spectroscopy. The experiments were performed at the Chemical Dynamics Beamline at the Advanced Light Source and used tunable vacuum ultraviolet synchrotron radiation for product photoionization. We have identified four primary dissociation channels including atomic and molecular hydrogen elimination. HCN elimination, and CN elimination. There is significant evidence that all of the dissociation channels occur on the ground electronic surface following internal conversion from the initially optically prepared state. The product translational energy distributions reflect near statistical simple bond rupture for the radical dissociation channels, while substantial recombination barriers mediate the translational energy release for the two molecular elimination channels. Photoionization onsets have provided additional insight into the chemical identities of the products and their internal energy content.
Kinetics of reactions of chlorinated vinyl radicals CH2CCl and C2Cl3 with molecular oxygen
Russell,Seetula,Gutman,Senkan
, p. 1934 - 1938 (2007/10/02)
The kinetics of the reactions of CH2CCl and C2Cl3 radicals with O2 have been studied in a tubular flow reactor coupled to a photoionization mass spectrometer in the temperature range 298-648 K. Radicals were produced by the homogeneous photolysis of a suitable precursor using an excimer laser. The observed or indicated reaction mechanisms as well as the rate constants, which were measured as a function of density and temperature, suggest that both of these reactions proceed via the formation of a short-lived bound RO2 intermediate that can either decompose back to the original reactants or form new oxygen-containing products following internal rearrangement of the adduct.
