An extension of the sudden approximation for atom surface scattering with large parallel momentum transfers

TY - JOUR

T1 - An extension of the sudden approximation for atom surface scattering with large parallel momentum transfers

AU - Hinch, B. J.

PY - 1989/10/3

Y1 - 1989/10/3

N2 - A modified sudden approximation is introduced for the calculation of elastic atom scattering intensities from surfaces. On the basis of a comparison with the limit of hard wall interaction potentials, this new sudden approximation will have an extended range of validity for scattering into final states with larger parallel momentum exchange. As for any coordinate representation sudden approximation, the method is equally applicable to both periodic and non-periodic surfaces. This paper reports the preliminary results of an investigation of the atom-surface interaction potentials at step edge defects using the new approximation. Comparisons with experimental data of diffuse scattering of He atoms from monatomic steps, on an otherwise perfect Pt(111) crystalline surface, indicate the presence of an attractive well in the vicinity of the step.

AB - A modified sudden approximation is introduced for the calculation of elastic atom scattering intensities from surfaces. On the basis of a comparison with the limit of hard wall interaction potentials, this new sudden approximation will have an extended range of validity for scattering into final states with larger parallel momentum exchange. As for any coordinate representation sudden approximation, the method is equally applicable to both periodic and non-periodic surfaces. This paper reports the preliminary results of an investigation of the atom-surface interaction potentials at step edge defects using the new approximation. Comparisons with experimental data of diffuse scattering of He atoms from monatomic steps, on an otherwise perfect Pt(111) crystalline surface, indicate the presence of an attractive well in the vicinity of the step.

UR - http://www.scopus.com/inward/record.url?scp=25544467525&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=25544467525&partnerID=8YFLogxK

U2 - 10.1016/0039-6028(89)90585-2

DO - 10.1016/0039-6028(89)90585-2

M3 - Article

SN - 0039-6028

VL - 221

SP - 346

EP - 364

JO - Surface Science

JF - Surface Science

IS - 1-2

ER -