Adsorption structures of NO/Pt(111) investigated by scanning tunneling microscopy

The adsorption structure of nitric oxide (NO) on Pt(111) was studied at 10 and 70 K by scanning tunneling microscopy (STM). The island growth modes at both temperatures are similar except for the domain size of the 2×2 structure. In these low temperature region, two phases can coexist at medium coverages. These phases are assigned to the two NO species occurring at different stretching-vibrational frequencies observed in the previous vibrational spectroscopic studies. The relative location of two different species observed by STM and its stretching-vibrational frequencies suggests that the adsorption sites of NO on the Pt(111) surface at low and high coverages correspond to the hollow and the on-top sites, respectively.

[1]  P. Sautet,et al.  VIBRATIONAL FREQUENCY AND CHEMISORPTION SITE : A DFT-PERIODIC STUDY OF NO ON PD (111) AND RH (111) SURFACES , 1998 .

[2]  D. King,et al.  Energetics, geometry and spin density of NO chemisorbed on Pt{111} , 1998 .

[3]  Masatoki Ito,et al.  Scanning Tunneling Microscopy Study of C(2×4)-NO/Pt(001) , 1997 .

[4]  K. Hata,et al.  Origin of the symmetric dimers in the Si(100) surface , 1997 .

[5]  G. Ertl,et al.  Identification of the "Active Sites" of a Surface-Catalyzed Reaction , 1996, Science.

[6]  K. Hata,et al.  Phase Transition between c (4×2) and p (2×2) Structures of the Si(100) Surface at 6 K Caused by the Fluctuation of Phase Defects on Dimer Rows due to Dimer Flip-Flop Motion , 1996 .

[7]  P. Sautet,et al.  STM and chemistry: a qualitative molecular orbital understanding of the image of CO on a Pt surface , 1996 .

[8]  M. Kawai,et al.  ADSORPTION AND DIMER FORMATION OF NITROGEN MONOXIDE ON PT(111) AT LOW TEMPERATURE , 1995 .

[9]  G. Graham,et al.  Why Rhodium in Automotive Three-Way Catalysts? , 1994 .

[10]  F. Komori,et al.  Laser-induced desorption and etching at surfaces , 1994 .

[11]  M. Hove,et al.  Dynamical LEED analyses of the Pt(111)-p(2× 2)-NO and the Ni(111)-c(4 × 2)-2NO structures: substrate relaxation and unexpected hollow-site adsorption , 1994 .

[12]  K. Taylor.  Nitric oxide catalysis in automotive exhaust systems , 1993 .

[13]  N. Kruse,et al.  Adsorption and reaction of CO, NO and mixtures of CO/NO on Rh{110} , 1992 .

[14]  D. Eigler,et al.  Atomic and Molecular Manipulation with the Scanning Tunneling Microscope , 1991, Science.

[15]  W. Ranke.  Low temperature adsorption and condensation of O2, H2O and NO on Pt(111), studied by core level and valence band photoemission , 1989 .

[16]  B. Hayden.  An infra-red reflection absorption study of the adsorption of NO on Pt(111) , 1983 .

[17]  J. Hylden,et al.  Infrared spectra of NO adlayers on Pt; their interpretation in terms of a vibrational-coupling model , 1982 .

[18]  B. Sexton,et al.  Nitric oxide adsorption on the Pt(111) surface , 1980 .

[19]  H. Ibach,et al.  Analysis of adsorption processes and surface reactions by vibration spectroscopy: adsorption of no on Pt(111) , 1978 .