@article{pronschinske_bruce_lewis_chen_calzolari_buongiorno-nardelli_shultz_you_dougherty_2013, title={Iron(ii) spin crossover films on Au(111): scanning probe microscopy and photoelectron spectroscopy}, volume={49}, ISSN={1359-7345 1364-548X}, url={http://dx.doi.org/10.1039/C3CC44904A}, DOI={10.1039/c3cc44904a}, abstractNote={The growth of films of [H2B(pz)2]Fe(ii)(bpy) on Au(111) is characterized from the bilayer film to multilayer film regime. Scanning tunneling microscopy shows a transition from a well-ordered, uniform bilayer film to a poorly-ordered film at larger thicknesses. Previous local tunneling spectroscopy and conductance mapping in bilayer films permit the identification of coexisting molecular spin-states at all temperatures. New ultraviolet photoelectron spectroscopy is consistent with this picture and in agreement with the density of states calculated by density functional theory. In thicker films with a polycrystalline morphology, evidence for a more bulk-like change in spin composition as a function of temperature is obtained by observing the reduction in intensity of Fe 2p core level satellites in X-ray photoelectron spectra.}, number={89}, journal={Chemical Communications}, publisher={Royal Society of Chemistry (RSC)}, author={Pronschinske, Alex and Bruce, Robert C. and Lewis, Geoff and Chen, Yifeng and Calzolari, Arrigo and Buongiorno-Nardelli, Marco and Shultz, David A. and You, Wei and Dougherty, Daniel B.}, year={2013}, pages={10446} }
 @article{pronschinske_chen_lewis_shultz_calzolari_buongiorno nardelli_dougherty_2013, title={Modification of Molecular Spin Crossover in Ultrathin Films}, volume={13}, ISSN={1530-6984 1530-6992}, url={http://dx.doi.org/10.1021/nl304304e}, DOI={10.1021/nl304304e}, abstractNote={Scanning tunneling microscopy and local conductance mapping show spin-state coexistence in bilayer films of Fe[(H2Bpz2)2bpy] on Au(111) that is independent of temperature between 131 and 300 K. This modification of bulk behavior is attributed in part to the unique packing constraints of the bilayer film that promote deviations from bulk behavior. The local density of states measured for different spin states shows that high-spin molecules have a smaller transport gap than low-spin molecules and are in agreement with density functional theory calculations.}, number={4}, journal={Nano Letters}, publisher={American Chemical Society (ACS)}, author={Pronschinske, Alex and Chen, Yifeng and Lewis, Geoffrey F. and Shultz, David A. and Calzolari, Arrigo and Buongiorno Nardelli, Marco and Dougherty, Daniel B.}, year={2013}, month={Mar}, pages={1429–1434} }
 @article{pronschinske_mardit_dougherty_2011, title={Modeling the constant-current distance-voltage mode of scanning tunneling spectroscopy}, volume={84}, ISSN={["2469-9969"]}, DOI={10.1103/physrevb.84.205427}, abstractNote={We demonstrate the relationship between sample density of electronic states and constant-current distance-voltage spectra starting from the usual expressions for tunneling current in scanning tunneling microscopy experiments. First-order differential equations are derived for the tip position as a function of voltage drop across the tunnel junction for both square and trapezoidal barrier transmission functions. Numerical solutions of the square barrier equation are carried out for different sample density of states and compared with self-consistent integration of the tunneling integral equation. It is shown that normalization of the distance vs voltage spectra by taking logarithmic derivatives reproduces the peak positions in the sample density of states usually to within 0.1 eV. The use of differential equations is proposed as an accurate method for analyzing experimental data and applied to the example case of the \ensuremath{\pi}${}^{*}$ orbital of the $c$(8 \ifmmode\times\else\texttimes\fi{} 2) phase of benzoate on Cu(110).}, number={20}, journal={PHYSICAL REVIEW B}, author={Pronschinske, Alex and Mardit, Daniel J. and Dougherty, Daniel B.}, year={2011}, month={Nov} }
 @article{wang_pronschinske_dougherty_2011, title={Scanning tunneling microscopy of a disordered Alq3-metal interface}, volume={12}, ISSN={["1878-5530"]}, DOI={10.1016/j.orgel.2011.07.020}, abstractNote={Scanning tunneling microscopy is used to observe the structure of the first monolayer of Alq3 on Cu(1 1 0). Individual molecules can be resolved at very low coverage where there is also evidence of significant surface mobility. As Alq3 surface coverage increases, molecules aggregate by forming pairs and chain-like structures without ever establishing long range order. Interfacial disorder is maintained even after annealing to 590 K. The tendency to form chain-like aggregates is attributed to anisotropic intermolecular interactions. Anisotropies in these interactions are implicated in chain formation by illustrative density functional theory calculations and the role of direct dipolar interactions, anisotropic van der Waals interactions, and substrate-mediated interactions is discussed.}, number={11}, journal={ORGANIC ELECTRONICS}, author={Wang, Zhengang and Pronschinske, Alex and Dougherty, Daniel B.}, year={2011}, month={Nov}, pages={1920–1926} }
 @article{pronschinske_dougherty_2010, title={Impact of Local Molecular Environment on the Decay of Image Potential States}, volume={1}, ISSN={["1948-7185"]}, DOI={10.1021/jz100854g}, abstractNote={Image potential-derived states of upright chemisorbed benzoate molecules on a Cu(110) surface have been measured with scanning tunneling spectroscopy. The widths of image-derived features for these adsorbates are sensitive to the presence of coexisting flat-lying benzoate molecules. This dependence is attributed to the different couplings between image potential state wave functions and bulk metal states that result from differences in substrate-mediated intermolecular interactions. The comparative trends are semiquantitatively modeled using a dielectric continuum approach.}, number={17}, journal={JOURNAL OF PHYSICAL CHEMISTRY LETTERS}, author={Pronschinske, Alex and Dougherty, Daniel B.}, year={2010}, month={Sep}, pages={2613–2617} }
 @article{sandin_pronschinske_rowe_dougherty_2010, title={Incomplete screening by epitaxial graphene on the Si face of 6H-SiC(0001)}, volume={97}, ISSN={["1077-3118"]}, DOI={10.1063/1.3484966}, abstractNote={A biased scanning tunneling microscope (STM) tip is used to study the ability of carriers in graphene to screen external electrostatic fields by monitoring the effect of tunneling-junction width on the position of image potential-derived surface states. These states are unusually sensitive to local electric fields due to the STM tip in both single layer and bilayer epitaxial graphene. This is attributed to the incomplete screening of applied fields in epitaxial graphene on SiC(0001). Our observations imply that charged impurity scattering is likely to be a dominant factor in the transport properties of epitaxial graphene on SiC.}, number={11}, journal={APPLIED PHYSICS LETTERS}, author={Sandin, Andreas and Pronschinske, Alex and Rowe, J. E. and Dougherty, Daniel B.}, year={2010}, month={Sep} }
 @article{bharath_pimputkar_pronschinske_pearl_2008, title={Liquid crystal deposition on poled, single crystalline lithium niobate}, volume={254}, ISSN={["1873-5584"]}, DOI={10.1016/j.apsusc.2007.08.040}, abstractNote={For the purpose of elucidating the mechanisms for molecular organization at poled ferroelectric surfaces, single crystalline lithium niobate (LN), 'Z-cut' along the (0 0 0 1) plane, has been prepared and characterized and subsequently exposed to liquid crystal molecules. As a model system we chose to study the anchoring of 4-n-octyl-4′-cyanobiphenyl (8CB) to LN. Liquid crystalline films are of interest because of their useful electronic and optical properties as well as chemical sensing attributes. Low-energy electron diffraction (LEED), atomic force microscopy (AFM), surface contact angle measurements (CA), and X-ray photoelectron spectroscopy (XPS) were used to characterize the surface of lithium niobate as well as the nature of 8CB films grown on the surface. Atomically flat LN surfaces were prepared as a support for monolayer thick, 8CB molecular domains. 8CB liquid crystal molecules were deposited by an ambient vaporization technique and the films were analyzed using XPS and CA. Understanding electrostatic anchoring mechanisms and thin film organization for this molecule on uniformly poled surfaces allows for a fuller appreciation of how molecular deposition of other polarizable molecules on periodically poled and patterned poled lithium niobate surfaces would occur.}, number={7}, journal={APPLIED SURFACE SCIENCE}, author={Bharath, S. C. and Pimputkar, K. R. and Pronschinske, A. M. and Pearl, T. P.}, year={2008}, month={Jan}, pages={2048–2053} }