The Interaction of HCN/DCN with Si(100)-2x1
Abstract
We have investigated the spectroscopy and reaction of HCN (DCN) adsorbed on Si(100)-2xl at T sub s greater than or equal to 100 K using high resolution electron energy loss spectroscopy (HREELS), X-ray photoelectron spectroscopy (XPS), and ultraviolet photoelectron spectroscopy (UPS). HCN (DCN) formed dimers and/or polymers on the surface at 100 K and higher dosages (D > 4 L). The HREEL spectrum obtained after warming a 4.5 L HCN dosed surface to 200 K resembles that obtained with a lower HCN dosage (D < 0.6 L). Two major species, HCNH and CN, could be identified from this spectrum. The former species showed peaks at 160, 368, and approx. 400 meV for HC=NH, CH, and NH stretching vibrations, respectively, while the latter showed a peak at 263 meV due to the C triple bonds N stretching vibration. In the corresponding DCN experiment, the DC=ND stretching mode was observed at 124 meV. Annealing the sample at 560 K appeared to cause the reorientation of the CN radical from an 'end-on' to a 'side-on' adsorption geometry as evidenced by HREELS, UPS, and XPS analyses. At 600-800 K, the breaking of CH, NH and CN bond occurred on the surface. Above 1000 K, only C and N species remained on the surface following the complete dissociation of CH, NH, and CN bonds and the desorption of H species.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1992
- Accession Number
- ADA260837
Entities
People
- Lang Ma
- Lin Ming-chang
- Yuheng Bu
Organizations
- Emory University