Adsorbate structure and vibrations on the Bi/Si(001)-(1x2) surface.

Journal Article · Mon Apr 01 04:00:00 EST 1996 · Physica B

DOI:https://doi.org/10.1016/0921-4526(95)00962-0· OSTI ID:937788

Lyman, P F; Qian, Y; Lee, T -L; Bedzyk, M J

X-ray standing wave measurements were undertaken to determine the bonding position and vibrational amplitude (normal to the surface plane) of Bi ad-dimers on the Bi-saturated Si(001)-(1 x 2) surface. Using the (004) Bragg reflection, we find that the center of the Bi ad-dimers lies 1.72 Angstroms above the bulk-like Si(004) surface atomic plane. Using the (008) Bragg reflection, we find that the room temperature root-mean-square vibrational amplitude of the Bi adatoms normal to the surface plane is 0.13 Angstroms. This direct determination of the adsorbate vibrational dynamics verifies earlier assumptions regarding the magnitude of adsorbate surface vibrations on Si surfaces, and suggests that the vibrational amplitude of dimerized group V/Si(001)-(1 x 2) structures is independent of the mass of the adsorbate.

• Research Organization: Argonne National Laboratory (ANL)
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 937788
• Report Number(s): ANL/MSD/JA-19760
• Journal Information: Physica B, Journal Name: Physica B Journal Issue: 1-4 ; Apr. 1996 Vol. 221; ISSN 0921-4526; ISSN PHYBE3
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

36 MATERIALS SCIENCE
BISMUTH
BRAGG REFLECTION
SILICON
SORPTIVE PROPERTIES
STANDING WAVES
X RADIATION