@article {95,
	title = {Surface Photochemistry of Adsorbed Nitrate: The Role of Adsorbed Water in the Formation of Reduced Nitrogen Species on α-Fe2O3 Particle Surfaces.},
	journal = {Journal of Physical Chemistry A},
	volume = {118},
	year = {2014},
	note = {CAPLUS AN 2013:1898077(Journal; Online Computer File)},
	pages = {158 - 166},
	publisher = {American Chemical Society},
	abstract = {The surface photochem. of nitrate, formed from nitric acid adsorption, on hematite (α-Fe2O3) particle surfaces under different environmental conditions is investigated using XPS.  Following exposure of α-Fe2O3 particle surfaces to gas-phase nitric acid, a peak in the N1s region is seen at 407.4 eV; this binding energy is indicative of adsorbed nitrate.  Upon broadband irradn. with light (λ > 300 nm), the nitrate peak decreases in intensity as a result of a decrease in adsorbed nitrate on the surface.  Concomitant with this decrease in the nitrate coverage, there is the appearance of two lower binding energy peaks in the N1s region at 401.7 and 400.3 eV, due to reduced nitrogen species.  The formation as well as the stability of these reduced nitrogen species, identified as NO- and N-, are further investigated as a function of water vapor pressure.  Addnl., irradn. of adsorbed nitrate on α-Fe2O3 generates three nitrogen gas-phase products including NO2, NO, and N2O.  As shown here, different environmental conditions of water vapor pressure and the presence of mol. oxygen greatly influence the relative photoproduct distribution from nitrate surface photochem.  The atm. implications of these results are discussed. [on SciFinder(R)]},
	keywords = {surface photochem nitrate nitric acid adsorbate iron oxide particle},
	isbn = {1089-5639},
	author = {Nanayakkara, Charith E. and Jayaweera, Pradeep M. and Rubasinghege, Gayan and Baltrusaitis, Jonas and Grassian, Vicki H.}
}
@article {159,
	title = {Sulfur Dioxide Adsorption on TiO2 Nanoparticles: Influence of Particle Size, Coadsorbates, Sample Pretreatment, and Light on Surface Speciation and Surface Coverage.},
	journal = {Journal of Physical Chemistry C},
	volume = {115},
	year = {2011},
	note = {CAPLUS AN 2010:1546849(Journal; Online Computer File)},
	month = {2011///},
	pages = {492 - 500},
	publisher = {American Chemical Society},
	abstract = {The adsorption of sulfur dioxide (SO2) on titanium dioxide (TiO2) nanoparticle surfaces at 296 K under a wide range of conditions has been investigated.  XPS is used to investigate the surface speciation and surface coverage of sulfur-contg. products on ca. 4 nm TiO2 anatase particles that remain on the surface following adsorption of SO2.  The effects of various environmental conditions of relative humidity, mol. oxygen, and broadband UV/vis irradn. as well as sample pretreatment were found to impact the speciation of adsorbed SO2 as well as the satn. coverage.  In particular, in the absence of light, the majority surface species upon SO2 adsorption is found to be adsorbed sulfite.  Broadband UV/vis irradn. during sulfur dioxide adsorption leads to an increase (nearly 2-fold) in the amt. of adsorbed sulfur species, as compared to expts. with no light, and results in the formation of adsorbed sulfate.  The formation of sulfate was quant. in the presence of mol. oxygen.  New surface species including chemisorbed mol. SO2 were obsd. on samples that have been reduced in vacuum through argon ion sputtering.  The total amt. of adsorbed sulfur was impacted by surface hydroxyl group coverage and molecularly adsorbed water layer.  Addnl., comparison of sulfur dioxide adsorption on 4 vs. 32 nm sized anatase nanoparticles showed that surface satn. coverages of adsorbed sulfite on the 4 nm particles was almost twice that of 32 nm particles as measured by the S2p:Ti2p peak area ratios, thus showing an increase in the inherent adsorption capacity of the smaller particles.  Proposed adsorption sites and mechanisms to account for the obsd. exptl. data are discussed. [on SciFinder(R)]},
	keywords = {adsorption sulfur dioxide titania nanoparticle surface speciation irradn},
	isbn = {1932-7447},
	author = {Baltrusaitis, Jonas and Jayaweera, Pradeep M. and Grassian, Vicki H.}
}
@article {170,
	title = {Reactions on Atmospheric Dust Particles: Surface Photochemistry and Size-Dependent Nanoscale Redox Chemistry.},
	journal = {Journal of Physical Chemistry Letters},
	volume = {1},
	year = {2010},
	note = {CAPLUS AN 2010:616561(Journal; General Review; Online Computer File)},
	month = {2010///},
	pages = {1729 - 1737},
	publisher = {American Chemical Society},
	abstract = {A review concerning new mechanisms and reaction pathways identified in lab. studies of atm. mineral dust and nano-dust (potential new source of metal-contg. dust from engineered nano-materials) components, particularly surface photochem. and size-dependent, nano-scale redox chem. is given. [on SciFinder(R)]},
	keywords = {review airborne dust nanodust reaction, size depended nanoscale redox chem airborne dust review, surface photochem airborne dust nanodust review},
	isbn = {1948-7185},
	url = {http://pubs.acs.org/doi/pdfplus/10.1021/jz100371d},
	author = {Rubasinghege, Gayan and Elzey, Sherrie and Baltrusaitis, Jonas and Jayaweera, Pradeep M. and Grassian, Vicki H.}
}
@article {176,
	title = {XPS study of nitrogen dioxide adsorption on metal oxide particle surfaces under different environmental conditions.},
	journal = {Physical Chemistry Chemical Physics},
	volume = {11},
	year = {2009},
	note = {CAPLUS AN 2009:1128237(Journal)},
	month = {2009///},
	pages = {8295 - 8305},
	publisher = {Royal Society of Chemistry},
	abstract = {The adsorption of nitrogen dioxide on gamma aluminum oxide (γ-Al2O3) and alpha iron oxide (α-Fe2O3) particle surfaces under various conditions of relative humidity, presence of mol. oxygen and UV light has been investigated.  XPS is used to monitor the different surface species that form under these environmental conditions.  Adsorption of NO2 on aluminum oxide particle surfaces results primarily in the formation of surface nitrate, NO3- with an oxidn. state of +5, as indicated by a peak with binding energy of 407.3 eV in the N1s region.  An addnl. minority species, sensitive to the presence of relative humidity and mol. oxygen, is also obsd. in the N1s region with lower binding energy of 405.9 eV.  This peak is assigned to a surface species in the +4 oxidn. state.  When irradiated with UV light, other species form on the surface.  These surface-bound photochem. products all have lower binding energy, between 400 and 402 eV, indicating reduced nitrogen species in the range of N oxidns. states spanning +1 to -1.  Co-adsorbed water decreases the amt. of these reduced surface-bound products while the presence of mol. oxygen completely suppresses the formation of all reduced nitrogen species on aluminum oxide particle surfaces.  For NO2 on iron oxide particle surfaces, photoredn. is enhanced relative to γ-Al2O3 and surface bound photoreduced species are obsd. under all environmental conditions.  Complementing the exptl. data, N1s core electron binding energies (CEBEs) were calcd. using DFT for a no. of nitrogen-contg. species in the gas phase and adsorbed on an Al8O12 cluster.  A range of CEBEs is calcd. for various nitrogen species in different adsorption modes and oxidn. states.  These calcd. values are discussed in light of the peaks obsd. in the XPS N1s region and the possible species that form following NO2 adsorption and photoreaction on metal oxide particle surfaces under different conditions of relative humidity, presence of mol. oxygen and UV light. [on SciFinder(R)]},
	keywords = {nitrogen dioxide adsorbed metal oxide surface species XPS, oxygen nitrogen dioxide adsorbed metal oxide surface species XPS, UV nitrogen dioxide adsorbed metal oxide surface species XPS, water nitrogen dioxide adsorbed metal oxide surface species XPS},
	isbn = {1463-9076},
	author = {Baltrusaitis, Jonas and Jayaweera, Pradeep M. and Grassian, Vicki H.}
}
