Reactive Beam Scattering

Introduction

One of our research interests is studying the kinetics and dynamics of surface reactions under controlled conditions in ultra-high vacuum (UHV). We are also interested in investigating the structure and vibrational spectra of atoms and molecules adsorbed on various substrates, using elastic and inelastic He scattering.

The machine consists of a UHV chamber and a differentially pumped source chamber where three independent molecular beams can be produced. All of the beams overlap at the position of the sample in the UHV chamber. Species scattered or desorbed from the sample are detected by a differentially-pumped mass spectrometer which rotates around the sample in a plane that contains the center beam. The sample polar angle  can also be changed so that the incident angle of the beams is variable. There are provisions to modulate the incident beams, and also a chopper mounted on the mass spectrometer to measure the velocity distributions of scattered and desorbed species.



Recent Results

Atomic Oxygen on Rh(111)
H20 on Rh(111) Xe/SAM




The Machine

Shown above is a schematic of the reactive beam scattering machine, for a rather incomprehensible picture click here.




References

39. "Kinetics of hydrogen oxidation to water on the Rh(111) surface using multiple source modulated molecular beam techniques"

D.F. Padowitz and S.J. Sibener, Surf. Sci. 254 125-143 (1991) Abstract

41. "New modulated molecular beam scattering methods for probing nonlinear and coverage-dependent reaction kinetics at surfaces" Abstract

D.F. Padowitz, K.A. Peterlinz, and S.J. Sibener, Langmuir 7 2566-2573 (1991)

42. "Coverage dependent desorption kinetics of CO from Rh(111) using time-resolved specular He scattering"

K.A. Peterlinz, T.J. Curtiss, and S.J. Sibener, J. Chem. Phys. 95 6972-6985 (1991) Abstract

48. "New molecular beam methods for coverage dependent kinetic measurements using time-resolved specular He scattering"

K.A. Peterlinz, T.J. Curtiss, and S.J. Sibener in: Surface Science of Catalysis, In Situ Probes and Reaction Kinetics,
D.J. Dwyer and F.M. Hoffmann eds., ACS Symposium Series 482 38-57 (ACS, Washington, 1992). Abstract

56. "Absorption, adsorption, and desorption studies of the oxygen/Rh(111) system using O2, NO, and NO2"

K.A. Peterlinz and S.J. Sibener, J. Phys. Chem. 99 2817-2825 (1995) Abstract

63. "CO oxidation on Rh(111): velocity and angular distributions of the CO2 product"

J.I. Colonell, K.D. Gibson, and S.J. Sibener, J. Chem. Phys. 103 6677-6690 (1995) Abstract

64. "Oxidation of H on Rh(111): H2O product velocity and angular distributions"

K.D. Gibson, J.I. Colonell, and S.J. Sibener, J. Chem. Phys. 103 6735-6739 (1995) Abstract

65. "Velocity distributions of recombinatively desorbed O2 originating from surface and subsurface oxygen/Rh(111)"

K.D. Gibson, J.I. Colonell, and S.J. Sibener, Surf. Sci. Lett. 343 L1151-L1155 (1995) Abstract

67. "Dynamics of NO reduction by H2 on Rh(111): velocity and angular distributions of the N2 product"

J.I. Colonell, K.D. Gibson, and S.J. Sibener, J. Chem. Phys. 104 6822-6833 (1996) Abstract

69. "Coverage dependence of the kinetics for H2 desorption from Rh(111)"

J.I. Colonell, T.J. Curtiss, and S.J. Sibener, Surf. Sci. 366 19-28 (1996) Abstract

74. "High density adsorbed oxygen on Rh(111) and enhanced routes to metallic oxidation using atomic oxygen"

K.D. Gibson, M. Viste, E.C. Sanchez, and S.J. Sibener, J. Chem. Phys. 110 2757-2760 (1999) Abstract

79. "The adsorption of water on clean and oxygen pre-dosed Rh(111): surface templating via (1x1)-O/Rh(111) induces formation of a novel high-density ice structure"

K.D. Gibson, M. Viste, and S.J. Sibener, J. Chem. Phys. 112 9582-9589 (2000) Abstract

80. "Physical and chemical properties of high-density atomic oxygen overlayers under UHV conditions: (1x1)-O/Rh(111)"

K.D. Gibson, M. Viste, E.C. Sanchez, and S.J. Sibener, J. Chem. Phys. 112 2470-2478 (2000) Abstract

83. "Heterogeneous combustion of benzene on Rh(111): kinetics and dynamics of CO and CO2 production"

M.E. Viste, K.D. Gibson, and S.J. Sibener, J. Catal. 191 237-244 (2000) Abstract


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