Ultrafast X-ray absorption near edge spectroscopy has been carried out for photo excited iron pentacarbonyl in ethanol with 2 picosecond resolution. A temporal resolution limited dissociation process was observed, followed by the formation of the mono-substituted complex Fe(CO)(4)EtOH within a few tens of picoseconds. The measurements have been carried out with a newly developed X-ray absorption instrument at station 7 ID-C of the Advanced Photon Source. The results show that single picosecond temporal resolution can be achieved at a synchrotron beam line.

Mass absorption coefficient spectra were measured between λ = 500 nm and 840 nm for nine forms of highly-absorbing carbonaceous aerosol: five samples generated from gas-, liquid-and solid-fueled flames; spark-discharge fullerene soot; graphene and reduced graphene oxide (rGO) crumpled nanosheets; and fullerene (C 60 ) assemblies. Aerosol absorption spectra were measured for size-and mass-selected particles and found to be dependent on fuel type and formative conditions. Flame-generated particles had morphologies consistent with freshly emitted black carbon (BC) with mass absorption coefficients (MAC) ranging between 3.8 m 2 g -1 and 8.6 m 2 g -1 at λ = 550 nm. Absorption Ångström exponents (AAE) -i.e. MAC spectral dependence -ranged between 1.0 and 1.3 for flame-generated particles and up to 7.5 for C 60 . The dependence of MAC and AAE on mobility diameter and particle morphology was also investigated. Lastly, the current data were compared to all previously published MAC measurements of highly-absorbing carbonaceous aerosol. Mass absorption coefficient spectra were measured between λ = 500 nm and 840 nm for nine 13 forms of highly-absorbing carbonaceous aerosol: five samples generated from gas-, liquid-and 14 solid-fueled flames; spark-discharge fullerene soot; graphene and reduced graphene oxide (rGO) 15 crumpled nanosheets; and fullerene (C 60 ) assemblies. Aerosol absorption spectra were measured 16 for size-and mass-selected particles and found to be dependent on fuel type and formative 17 conditions. Flame-generated particles had morphologies consistent with freshly emitted black 18 carbon (BC) with mass absorption coefficients (MAC) ranging between 3.8 m 2 g -1 and 8.6 m 2 g -1 19at λ = 550 nm. Absorption Ångström exponents (AAE) -i.e. MAC spectral dependence -ranged 20 between 1.0 and 1.3 for flame-generated particles and up to 7.5 for C 60 . The dependence of MAC 21 and AAE on mobility diameter and particle morphology was also investigated. Lastly, the current 22 M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 2 data were compared to all previously published MAC measurements of highly-absorbing 23 carbonaceous aerosol. 24

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