Electron energy loss spectroscopy (EELS) of CH/sub 3/NH/sub 2/ adsorbed on Ni(100), Ni(111), Cr(100), and Cr(111)

Journal Article · Sun Dec 01 04:00:00 EST 1985 · J. Chem. Phys.; (United States)

OSTI ID:6464509

Baca, A G; Schulz, M A; Shirley, D A

Adsorbed CH/sub 3/NH/sub 2/ has been studied on Ni(100), Ni(111), Cr(100), and Cr(111) at 300 K using electron energy loss spectroscopy. The vibrational spectra indicate that molecular CH/sub 3/NH/sub 2/ exists on all four surfaces with bonding through the nitrogen lone pair, although a substantial amount of dissociation also occurs on the chromium surfaces. Approximately one monolayer of surface species is the stable coverage on each surface at 300 K. The possible existence of coadsorbed dissociation products CH/sub x/ and NH/sub x/ is discussed. The CN stretch is anomalously broad on Ni (100) and Ni(111) but not detectably broadened on Cr(100), indicating a strong sensitivity of this bond to interactions with the Ni surfaces. A multiplicity of sites is indicated on Cr(111) by the breadth of all the peaks. The loss spectra exhibit striking intensity differences, which can be attributed partly to impact scattering and partly to intrinsic differences in the interaction of CH/sub 3/NH/sub 2/ with the different surfaces. A model explaining the linewidth and intensity differences is proposed.

• Research Organization: Materials and Molecular Research Division, Lawrence Berkeley Laboratory, and Department of Chemistry, University of California, Berkeley, California 94720
• OSTI ID: 6464509
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 83:11; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION
CHEMICAL BONDS
CHROMIUM
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
METALS
NICKEL
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
SORPTION
SORPTIVE PROPERTIES
SPECTROSCOPY
SURFACE PROPERTIES
TRANSITION ELEMENTS
VIBRATIONAL STATES