The initial kinetic energy of 0 ions produced by dissociative attachment in 02 at an electron energy of 6.9 e.v. may be determined from Equation 4 to be 1.64 e.v. using values of 1.465 e.v. (1) for A(0) and 5.09 e.v. (7) for D(O—O). The residence time for 0 ions calculated from Equation 1 is 6.0 X 10 7 sec. at 10 volts repeller potential. Rate constants for Reaction 6 determined from data at varying Vr are shown in Table I and are seen to increase sharply with increasing repeller potential, as expected for an endothermic process. [Pg.41]

Consideration of work by Buchel nikova (4) on the dissociative attachment of electrons to HC1 leads to the conclusion that k4 is given approximately by k4 10-10 e 20 mtRT cm.3 molecule-1 sec.-1 Since K 4 2 X 10-3 el8 miRT at 2000°K., 4 10 13 cm.3 molecule-1 sec.-1 This is considerably smaller than rate constants for other exothermal ion-molecule reactions, which probably reflects the importance of participation of molecular vibrational energy in such reactions. Remember, however, that the uncertainty in 4 is probably at least an order of magnitude. [Pg.318]

The complex-potential model originated as a qualitative explanation of dissociative attachment [18]. A fixed-nuclei electronic resonance is described by a complex potential whose width goes to zero at the crossing point with the molecular ground-state potential, and remains zero if the resonance potential remains below the target [Pg.163]

Bardsley, J.N., Herzenberg, A. and Mandl, F. (1966). Vibrational excitation and dissociative attachment in the scattering of electrons by hydrogen molecules, Proc. Phys. Soc. (London) 89, 321-340. [Pg.206]

Nesbet, R.K. (1996). Nonadiabatic phase-matrix method for vibrational excitation and dissociative attachment in electron-molecule scattering, Phys. Rev. A 54, [Pg.161]

Schneider, B.I., LeDourneuf, M. and Burke, P.G. (1979). Theory of vibrational excitation and dissociative attachment an R-matrix approach, J. Phys. B 12, L365-L369. [Pg.220]

Domcke, W. and Miindel, C. (1985). Calculation of cross sections for vibrational excitation and dissociative attachment in HC1 and DC1 beyond the local complex potential approximation, J. Phys. B 18, 4491 1509. [Pg.208]

Martel R, Avouris Ph and Lyo l-W 1996 Molecularly adsorbed oxygen species on Si(111)-(7 7) STM-induced dissociative attachment studies Science 272 385 [Pg.319]

Dimensionless amplitude, 141 Directional bremsstrahlung, 131 Displacive excitation of coherent phonons (DECP), 27, 56 Dissociative attachment, 103 Double plasma mirror (DPM), 194 Dual energy subtraction imaging, 178 [Pg.209]

Miindel, C. and Domcke, W. (1984). Nuclear dynamics in resonant electron-molecule scattering beyond the local approximation model calculations on dissociative attachment and vibrational excitation, J. Phys. B 17, 3593-3616. [Pg.216]

Since under Green s conditions, a 10-7 cm.3 molecule-1 sec.-1 (unpublished experiments at AeroChem), n+ ne- 1011 cm.-3, /iH2o 3 X 1017 cm.-3, and n0h- 109 cm.-3, then kz 3 X 10-16 cm.3 molecule-1 sec.-1 This is some three orders of magnitude greater than the maximum value of kz calculated on the basis of Buchel nikova s data. Therefore, dissociative attachment of electrons to water is too slow to account for the observed concentrations of negative ions. [Pg.300]

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