A TEMPERATURE-PROGRAMMED X-RAY PHOTOELECTRON SPECTROSCOPY STUDY OF THE DECOMPOSITION REACTIONS OF UNSATURATED HYDROCARBONS ON Ni(100)

Abstract

We present a temperature-programmed X-ray photoelectron spectroscopy study of the thermal chemistry of acetylene, ethylene and propene on Ni(100) using synchrotron radiation. The use of a third generation light source makes it possible to measure high resolution photoemission spectra within a few seconds approaching the ideal of real-time analysis. The evolution of the C 1s core level spectra has been monitored in situ as a function of sample temperature from 90 to 530 K. Analysis of binding energies and changes in intensities and correlation with previous data from the literature have allowed us to distinguish the surface intermediates formed during the thermal reactions. The resultant temperature-dependent intensity curves clarify the dehydrogenation mechanisms of acetylene and ethylene and provide new insight into the decomposition of propene.

Ultrafast x-ray photoelectron spectroscopy in the microsecond time domain

“…[21][22][23][24] In addition to the mentioned applications, which all make use of synchrotron radiation in the "multi-bunch mode," for pump and probe-type experiments with much shorter timescales in the nanosecond regime or below the synchrotron facility must be operated in the single bunch mode, i.e., the pulsed time structure of the synchrotron radiation is made use of Ref. 25.…”