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Potassium and hydrogen co-adsorption on a stepped tungsten (100) surface
A154 Surface Science 211/212 (1989) 923 930 North-Holland, Amsterdam
923
THE C O A D S O R P T I O N OF H Y D R O G E N A N D NITRIC OXIDE O N Pd(100) S T U D I E D BY EELS C. N Y B E R G and P. U V D A [ lkepartment ~[ Phr.s'lcs, Chahner.~ L nil,er~itv Of 7),chnolo~', .S" 412 ~t~ (;i~tehorg. .S'weden Received 22 June 1988: accepted fvr publication 23 September 1988 High resolution electron energy loss spectroscopy (EELS) and low energy electron diffraction (LEED) have been used to stud,, the coadsorption of hydrogen and nitric oxide on Pd(100). The NO molecules adsorb in the same >ires on the Pd(100)p(t × 1)H surface a,, on the clean Pd(100) surface. The NO adlayer forces the hydrogen atoms to move deeper into the substrate.
Surface Science 211/212 (1989) 931 939 North-Holland, Amsterdam
931
POTASSIUM AND HYDROGEN CO-ADSORPTION ON A S T E P P E D T U N G S T E N (100) SURFACE Z.Y. L1, R.N. LAMB *, W. A L L I S O N and R.F. WILLIS ** ('a~endish Laboratoi~v, Madingl
940
Surface Science 211/212 (1989) 940 947 North-Holland, Amsterdam
THE SCATTERING OF H 2 A N D D 2 F R O M Cu(100): VIBRATIONALLY A S S I S T E D DISSOCIATIVE A D S O R P T I O N M. H A N D and S. H O L L O W A Y Surface Science Research Centre, University of Liverpool, P.O. Box 147, Lit~erpool L69 3BX. UK Received 21 June 1988; accepted for publication 28 September 1988 The activated adsorption of H 2 on the Cu(100) surface has been modeled quantum mechanically using an ab initio potential energy surface. The time evolution of a molecular wavepacket has been calculated using the split operator method of Fleck, Morris and Feit. The dissociation probability, So and transition probabilities to excited vibrational states of the scattered molecules were calculated for various initial incident translational energies, E ± , vibrational states. The results are explained in terms of tunneling through an activation barrier in the vibrational coordinate. A comparison with results for S0 based on classical trajectory calculations is made.
923
THE C O A D S O R P T I O N OF H Y D R O G E N A N D NITRIC OXIDE O N Pd(100) S T U D I E D BY EELS C. N Y B E R G and P. U V D A [ lkepartment ~[ Phr.s'lcs, Chahner.~ L nil,er~itv Of 7),chnolo~', .S" 412 ~t~ (;i~tehorg. .S'weden Received 22 June 1988: accepted fvr publication 23 September 1988 High resolution electron energy loss spectroscopy (EELS) and low energy electron diffraction (LEED) have been used to stud,, the coadsorption of hydrogen and nitric oxide on Pd(100). The NO molecules adsorb in the same >ires on the Pd(100)p(t × 1)H surface a,, on the clean Pd(100) surface. The NO adlayer forces the hydrogen atoms to move deeper into the substrate.
Surface Science 211/212 (1989) 931 939 North-Holland, Amsterdam
931
POTASSIUM AND HYDROGEN CO-ADSORPTION ON A S T E P P E D T U N G S T E N (100) SURFACE Z.Y. L1, R.N. LAMB *, W. A L L I S O N and R.F. WILLIS ** ('a~endish Laboratoi~v, Madingl
940
Surface Science 211/212 (1989) 940 947 North-Holland, Amsterdam
THE SCATTERING OF H 2 A N D D 2 F R O M Cu(100): VIBRATIONALLY A S S I S T E D DISSOCIATIVE A D S O R P T I O N M. H A N D and S. H O L L O W A Y Surface Science Research Centre, University of Liverpool, P.O. Box 147, Lit~erpool L69 3BX. UK Received 21 June 1988; accepted for publication 28 September 1988 The activated adsorption of H 2 on the Cu(100) surface has been modeled quantum mechanically using an ab initio potential energy surface. The time evolution of a molecular wavepacket has been calculated using the split operator method of Fleck, Morris and Feit. The dissociation probability, So and transition probabilities to excited vibrational states of the scattered molecules were calculated for various initial incident translational energies, E ± , vibrational states. The results are explained in terms of tunneling through an activation barrier in the vibrational coordinate. A comparison with results for S0 based on classical trajectory calculations is made.