Application of high-resolution electron energy loss spectroscopy to the adsorption and the photoreaction of CH2I2 and CD3OD on a MoOx thin film

Abstract

Highresolution electron energy loss spectroscopy and infrared spectroscopy of polymer surfaces: Highresolution and orientation effects of polytetrafluoroethylene films J. Vac. Sci. Technol. A 14, 95 (1996); 10.1116/1.579886 Adsorption and reaction of formic acid on NiO(100) films on Mo(100): Temperature programmed desorption and high resolution electron energy loss spectroscopy studiesThe adsorption and the photoreaction of CH 2 I 2 and CD 3 OD on sublimated molybdenum oxide surfaces have been studied using high-resolution electron energy loss spectroscopy combined with thermal and photoinduced desorption spectroscopy. The energy loss peaks for ͑C-H͒, ͑C-D͒, ͑C-O͒ and ␦ ͑CH 2 ͒ are detected for CH 2 I 2 and CD 3 OD adsorbed on the MoO x thin film, where the energy losses of the ͑C-H͒ stretch and ͑C-D͒ stretch are mainly caused by impact scattering. CD 3 OH adsorbed on the MoO x thin film surface photodesorbs as CD 3 OD and CD 2 O due to illumination by ultraviolet ͑UV͒ light. CH 2 I 2 adsorbs on the MoO x thin film without dissociation at room temperature, but undergoes photodissociation upon illumination by UV light via the production of intermediate vCH 2 ͑a͒ species.

Infrared study of the adsorption of CO and CH3 on silica-supported MoO3 and Mo2C catalysts

“…The band due to CH 3(a) Similarly to the above results ethylene formation (T p = 520 K) was experienced from Mo 2 C/Mo(1 1 1) single crystal surface after adsorption of CH 3 I at 300 K [26]. Ethylene was not evolved from CH 2(a) produced by CH 2 I 2 adsorption on Mo(1 0 0) and oxygen-covered Mo(1 0 0) [27], and on MoO x thin film [28].…”

Synthesis, characterization and surface reactivity of tungsten carbide (WC) PVD films

“…For the PVD films, count rates in the elastic peak were typically in the range of 1.5 · 10 3 to 1.5 · 10 3 cps, and the spectral resolution was between 50 and 70 cm À1 FWHM (full-width at half maximum). Although the intensity and spectral resolutions are significantly degraded as compared to those on single crystal surfaces, the HREELS results from the PVD WC films are adequate to determine the reaction pathways of cyclohexene [18][19][20][21][22][23]. For TPD and HREELS experiments the WC film was heated with a linear heating rate of 1.5 K/s.…”