Accession Number : ADA262589


Title :   Photoelectron Spectroscopy of MoS2 at the Sulfur 2p Absorption Edge


Descriptive Note : Technical rept.


Corporate Author : AEROSPACE CORP EL SEGUNDO CA TECHNOLOGY OPERATIONS


Personal Author(s) : Didziulis, Stephen V ; Lince, Jeffrey R ; Shuh, D K ; Durbin, T D ; Yarmoff, J A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a262589.pdf


Report Date : 15 Oct 1992


Pagination or Media Count : 27


Abstract : The sulfur 2p absorption edge and valence band resonant photoelectron spectra of molybdenum disulfide (MoS2), obtained using synchrotron radiation, are compared to the Mo 4p edge results from previous work. A pre-edge feature in the S 2p data shows transitions to unoccupied, dominantly Mo 4d antibonding levels, indicating that significant covalent interactions exist between Mo and S valence orbitals. Resonant enhancement of valence band photoelectron shake-up peaks is observed at the S 2p - Mo 4d excitation energies, while the sulfur L sub 2,3VV Auger peak dominates the spectrum when the S 2p ionization threshold is reached. Antiresonant intensity modulation of main valence band peaks is observed at photon energies corresponding to the S 2p - Mo 4d pre-edge feature. The results show that the principal decay channel after the S 2p- Mo 4d excitation leads to the enhancement of final states having S 3p sup 4 Mo 4d sup 3 electron configurations.... Photoelectron spectroscopy, Molybdenum disulfide, Solid lubricant, Resonant photoelectron spectroscopy.


Descriptors :   *MOLYBDENUM , *SOLID LUBRICANTS , *SULFUR , *SULFIDES , *PHOTOELECTRON SPECTRA , PEAK VALUES , SPECTROSCOPY , INTERACTIONS , EDGES , EXCITATION , ADHESION , AUGMENTATION , INTENSITY , CHEMICAL BONDS , ELECTRONS , VALENCE BANDS , CONFIGURATIONS , RESONANCE , WEAR , IONIZATION , PHOTONS , TRANSITIONS , ABSORPTION , MODULATION , FRICTION , DECAY , AUGERS , CHANNELS , LUBRICANTS , SYNCHROTRON RADIATION


Subject Categories : Inorganic Chemistry
      Physical Chemistry
      Nuclear Physics & Elementary Particle Physics


Distribution Statement : APPROVED FOR PUBLIC RELEASE