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The adsorption/desorption of ethene (C2H4), also commonly known as ethylene,on Fe3O4(001) was studied under ultrahigh vacuum conditions using temperatureprogrammed desorption (TPD), scanning tunneling microscopy, x-ray photoelectronspectroscopy, and density functional theory (DFT) based computations. Tointerpret the TPD data, we have employed a new analysis method based onequilibrium thermodynamics. C2H4 adsorbs intact at all coverages and interactsmost strongly with surface defects such as antiphase domain boundaries and Feadatoms. On the regular surface, C2H4 binds atop surface Fe sites up to acoverage of 2 molecules per (rt2xrt2)R45{\deg} unit cell, with every second Feoccupied. A desorption energy of 0.36 eV is determined by analysis of the TPDspectra at this coverage, which is approximately 0.1-0.2 eV lower than thevalue calculated by DFT + U with van der Waals corrections. Additionalmolecules are accommodated in between the Fe rows. These are stabilized byattractive interactions with the molecules adsorbed at Fe sites. The totalcapacity of the surface for C2H4 adsorption is found to be close to 4 moleculesper (rt2xrt2)R45{\deg} unit cell.

A Multi-Technique Study of C2H4 Adsorption on Fe3O4(001)