The dissociative chemisorption of cyclopropane on Ir(110)

Kelly, D.; Weinberg, W. H.
October 1996
Journal of Chemical Physics;10/22/1996, Vol. 105 Issue 16, p7171
Academic Journal
We have employed molecular beam techniques to investigate the dissociative chemisorption of cyclopropane on Ir(110) as a function of beam translational energy, Ei, from 1.5 to 48 kcal/mol, and surface temperature, Ts, from 85 to 1200 K. For Ts=85 K, c-C3H6 is molecularly adsorbed on Ir(110) with a trapping probability, ξ, of 0.97 at Ei=1.5 kcal/mol and ξ=0.90 at Ei=5 kcal/mol. For Ei≤5 kcal/mol, c-C3H6 is dissociatively adsorbed through a mechanism of trapping-mediated chemisorption, with initial probabilities of chemisorption, Pa, decreasing with increasing surface temperature from the intrinsic trapping probability at Ts=150 K, to Pa<0.05 above Ts=1000 K. The activation energy for trapping-mediated chemisorption of c-C3H6, referenced to the bottom of the physically adsorbed well and attributed to C–C bond cleavage, is 3.6±0.2 kcal/mol. For Ei≥10 kcal/mol, direct dissociative chemisorption increasingly contributes to the overall measured initial probability of chemisorption of cyclopropane. The initial probability of direct dissociative chemisorption of c-C3H6 increases approximately linearly from Pa=0.1 at Ei=10 kcal/mol, to Pa=0.5 at Ei=45 kcal/mol. No isotope effect is observed for the direct dissociative chemisorption of c-C3D6 for beam translational energies of 17 to 48 kcal/mol, indicating that C–C bond cleavage is the initial reaction coordinate for direct chemisorption of cyclopropane on Ir(110). © 1996 American Institute of Physics.


Related Articles

  • Supersonic molecular beam studies of the dissociative chemisorption of GeH4 and Ge2H6 on the Ge(100) and Ge(111) surfaces. Jones, M. E.; Roadman, S. E.; Lam, A. M.; Eres, G.; Engstrom, J. R. // Journal of Chemical Physics;10/22/1996, Vol. 105 Issue 16, p7140 

    The reaction probabilities of GeH4 and Ge2H6 on the Ge(100) and Ge(111) surfaces have been measured as a function of substrate temperature, incident kinetic energy, and angle of incidence employing supersonic molecular beam scattering techniques. At sufficiently large incident kinetic energies...

  • A molecular beam investigation into the dynamics and kinetics of dissociative O2 adsorption on Pt{100}-(1×1). Bradley, J. M.; Guo, X.-C.; Hopkinson, A.; King, D. A. // Journal of Chemical Physics;3/15/1996, Vol. 104 Issue 11, p4283 

    The dissociative chemisorption of oxygen on Pt{100}-(1×1) has been investigated using supersonic molecular beams with incident translational energies between 0.04 and 0.90 eV over the surface temperature range 300 to 380 K. The adsorption process on the Pt{100}-(1×1) surface is found to...

  • Vacuum ultraviolet laser spectra of ICl. Lipson, R. H.; Hoy, A. R. // Journal of Chemical Physics;6/15/1989, Vol. 90 Issue 12, p6821 

    Vacuum ultraviolet fluorescence excitation spectra of jet cooled ICl have been recorded between 158 and 166 nm using a VUV ‘‘laser’’ generated by four-wave sum-mixing in Mg vapor. An unambiguous vibrational analysis of the spectra has shown that transitions from...

  • Dissociative resonance activation of cyclopropane monolayers on copper: Evidence for CH and CC... Martel, Richard; McBreen, Peter H. // Journal of Chemical Physics;11/22/1997, Vol. 107 Issue 20, p8619 

    Studies the dissociative resonance activation of cyclopropane monolayers on copper. Use of the electron beam intrinsic to a high resolution electron energy loss spectrometer to perform the energy selective electron beam modification of cyclopropane on copper and single crystal surfaces.

  • Dynamics of dissociative methane adsorption on metals: CH[sub 4] on Pt{110}(1x2). Walker, A. V.; Walker, A.V.; King, D. A.; King, D.A. // Journal of Chemical Physics;3/8/2000, Vol. 112 Issue 10 

    Supersonic molecular beams have been used to study methane dissociative adsorption on Pt{110}(1x2) at incident translational energies of 20 to 700 meV, incident vibrational temperatures of 300 to 800 K and surface temperatures from 400 to 1000 K. At E[sub t]≤100 meV, the initial...

  • Real-time dynamics of clusters. I. I2Xn (n=1). Willberg, D. M.; Gutmann, M.; Breen, J. J.; Zewail, A. H. // Journal of Chemical Physics;1/1/1992, Vol. 96 Issue 1, p198 

    Vibrational predissociation of I2Xn (X=Ne, Ar) van der Waals clusters are studied in real-time using picosecond pump–probe (LIF) and molecular beam techniques. The state-to-state rates of vibrational predissociation are measured for specific vibrational levels v’i by monitoring the...

  • Molecular beam study of dissociative sticking of methane on Ni(100). Holmblad, P. M.; Wambach, J.; Chorkendorff, I. // Journal of Chemical Physics;5/22/1995, Vol. 102 Issue 20, p8255 

    This paper reports a detailed molecular beam study of the dissociative sticking of methane incident on clean Ni(100). It is demonstrated that the sticking coefficient depends strongly on the translational energy of the molecule. It is also observed that an increase in the vibrational energy of...

  • A crossed laser-molecular beam study of the one and two photon dissociation dynamics of ferrocene at 193 and 248 nm. Ray, Urmi; Hou, Hui Qi; Zhang, Zhvangjian; Schwarz, Wolfgang; Vernon, Matt // Journal of Chemical Physics;4/15/1989, Vol. 90 Issue 8, p4248 

    A crossed laser-molecular beam study of the one and two photon dissociation mechanism of bis (cyclopentadienyl) iron (ferrocene, FeCp2) has been performed at 193 and 248 nm. By combining electron bombardment mass spectroscopy with time-of-flight (TOF) measurements, the photodissociation...

  • On the concept and distribution of reactive sites in dissociative chemisorption. Kara, Abdelkader; DePristo, Andrew E. // Journal of Chemical Physics;5/1/1990, Vol. 92 Issue 9, p5653 

    We present results of classical stochastic molecular dynamics simulations of dissociative chemisorption in two different model systems, H2 /Ni(100) and N2 /W(110). Based upon the separation of time scales between dissociation and translations and rotations, we determine: (1) the location of the...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics