2008 Publications

• Bush, M. F.; Saykally, R. J.; Williams, E. R. Reactivity and Infrared Spectroscopy of Gaseous Hydrated Trivalent Metal Ions Journal of the American Chemical Society 2008, , DOI: 10.1021/ja801894d. web
• O'Brien, J. T.; Williams, E. R. Hydration of Gaseous Copper Dications Probed by IR Action Spectroscopy. Journal of Physical Chemistry A 2008, , DOI: 10.1021/jp7115643. web
• Holm, A. I. S.; Larson, M. K.; Panja, S.; Hvelplund, P.; Nielson, S. B.; Leib, R. D.; Donald, W. A.; Williams, E. R.; Hao, C.; Turecek, F. Electron capture, femtosecond electron transfer and theory: A study of noncovalent crown ether 1,n-diammonium alkane complexes. International Journal of Mass Spectrometry 2008, , DOI: 10.1016/j.ijms.2008.04.021. web
• O'Brien, J. T.; Prell, J. S.; Holm, A. I. S. Williams, E. R. Effects of Electron Kinetic Energy and Ion-Electron Inelastic Collisions in Electron Capture Dissociation Measured Using Ion Nanocalorimetry. Journal of American Society for Mass Spectrometry 2008, 19, 772-779. web
• Bush, M. F.; Oomens, J.; Saykally, R. J.; Williams, E. R. Effects of Alkaline Earth Metal Ion Complexation on Amino Acid Zwitterion Stability: Results from Infrared Action Spectroscopy. Journal of the American Chemical Society 2008, 130, 6463-6471 web
• Donald, W. A.; Williams, E. R. Evaluation of Different Implementations of the Thomson Liquid Drop Model: Comparison to Monovalent and Divalent Cluster Ion Experimental Data. Journal of Physical Chemistry A 2008, 112, 3515-3522. web
• Donald, W. A.; Leib, R. D.; O'Brien, J. T.; Bush, M. F.; Williams, E. R. Absolute Standard Hydrogen Electrode Potential Measured by Reduction of Aqueous Nanodrops in the Gas Phase. Journal of the American Chemical Society 2008, 130, 3371-3381. web

2007 Publications

• Forbes, M. W.; Bush, M. F.; Polfer, N. C; Oomens, J.; Dunbar, R. C.; Williams, E. R.; Jockusch, R. A. Infrared Spectroscopy of Arginine Cation Complexes: Direct Observation of Gas-Phase Zwitterions. Journal of Physical Chemistry A. 2007, 111, 11759-11770. web
• Bush, M. F.; Prell, J. S; Saykally, R. J.; Williams, E. R. One Water Molecule Stabilizes the Cationized Arginine Zwitterion. Journal of the American Chemical Society 2007, 129, 13544-13553. web
• Bush, M. F.; Saykally, R.J.; Williams, E. R. Hydration of the Calcium Dication: Direct Evidence for Second Shell Formation from Infrared Spectroscopy. ChemPhysChem 2007, 8, 2245 - 2253. web
• Holm, A. I. S.; Hvelplund, P.; Kadhane, U.; Larsen, M. K.; Liu, B.; Nielsen, S. B.; Panja, S.; Pedersen, J. M.; Skrydstrup, T.; Stochkel, K.; Williams, E. R.; Worm, E. S. On the Mechanism of Electron-Capture-Induced Dissociation of Peptide Dications from ¹⁵N-Labeling and Crown-Ether Complexation. Journal of Physical Chemistry A. 2007, doi: 10.1021/jp075943y. web
• Bush, M. F.; Forbes, M.W.; Jockusch, R.A; Oomens, J.; Polfer, N.C; Saykally, R.J.; Williams, E. R. Infrared Spectroscopy of Cationized Lysine and e-N-methyllysine in the Gas Phase: Effects of Alkali-Metal Ion Size and Proton Affinty on Zwitterion Stability. Journal of Physical Chemistry A. 2007, 111, 7753-7760. web
• Leib, R. D.; Donald, W. A.; O'Brien, J. T.; Bush, M. F.; Williams, E. R. Reduction Energy of 1 M Aqueous Ruthenium(III) Hexaammine in the Gas Phase: A Route toward Establishing an Absolute Electrochemical Scale. Journal of the American Chemical Society. 2007, 129, 716-7717. web
• Leib, R. D.; Donald, W. A.; Bush, M. F.; O'Brien, J. T.; Williams, E. R. Nonergodicity in Electron Capture Dissociation Investigated Using Hydrated Ion Nanocalorimetry. Journal of the American Society for Mass Spectrometry. 2007, 18, 1217-1231. web
• Leib, R. D.; Donald, W. A.; Bush, M. F.; O'Brien, J. T.; Williams, E. R. Internal Energy Deposition in Electron Capture Dissociation Measured Using Hydrated Divalent Metal Ions as Nanocalorimeters . Journal of the American Chemical Society. 2007, 129, 4894-4895. web
• Bush, M. F., Saykally, R. J. and Williams, E. R. Evidence for Water Rings in the Hexahydrated Sulfate Dianion from IR Spectroscopy. Journal of the American Chemical Society. 2007, 129, 2220-2221.  web
• Bush, M. F., O'Brien, J. T., Prell, J. S., Saykally, R. J. and Williams, E. R. Infrared Spectroscopy of Cationized Arginine in the Gas Phase: Direct Evidence for the Transition from Nonzwitterionic to Zwitterionic Structure. Journal of the American Chemical Society. 2007, 129, 1612-1622. web 
• Robinson, E.W.; Sellon, R.E.; Williams, E.R. Peak deconvolution in high-field asymmetric waveform ion mobility spectrometry (FAIMS) to characterize macromolecular conformations. International Journal of Mass Spectrometry 2007, 259, 87-95. web

2006 Publications

• Bush, M. F., Saykally, R. J. and Williams, E. R. Formation of Hydrated Triply Charged Metal Ions from Aqueous Solutions using Nanodrop Mass Spectrometry. International Journal of Mass Spectrometry. 2006, 252, 256-262. web
• Robinson, E. W., Leib, R. D. and Williams, E. R. The Role of Conformation on Electron Capture Dissociation of Ubiquitin. Journal of the American Society for Mass Spectrometry. 2006, 17, 1470-1480. web
• Robinson, E. W., Garcia, D. E., Leib, R. D. and Williams, E. R. Enhanced Mixture Analysis of Poly(ethylene glycol) Using High-Field Asymmetric Waveform Ion Mobility Spectrometry Combined with Fourier Transform Ion Cyclotron Resonance Mass Spectrometry. Analytical Chemistry. 2006, 78, 2190-2198. web
• Lemoff, A. S., Bush, M. F., O'Brien, J. T. and Williams, E. R. Structures of Lithiated Lysine and Structural Analogues in the Gas Phase: Effects of Water and Proton Affinity on Zwitterionic Stability. Journal of Physical Chemistry A. 2006, 110, 8433-8442. web
• Lemoff, A. S., Wu, C.-C., Bush, M. F. and Williams, E. R. Binding Energies of Water to Doubly Hydrated Cationized Glutamine and Structural Analogues in the Gas Phase. Journal of Physical Chemistry A. 2006, 110, 3662-3669. web
• Krishnaswamy, S. R., Williams, E. R. and Kirsch, J. F. Free energies of protein-protein association determined by electrospray ionization mass spectrometry correlate accurately with values obtained by solution methods. Protein Science. 2006, 15, 1465-1475. web
• Kamariotis, A., Boyarkin, O. V., Mercier, S., Beck, R. D., Bush, M. F., Williams, E. R. and Rizzo, T. R. Infrared Spectroscopy of hydrated amino acids in the gas phase: protonated and lithiated valine.. Journal of the American Chemical Society. 2006, 128, 905-916. web
• Chakraborty, T., Holm, A. I. S., Hvelplund, P., Nielsen, S. B., Poully, J.-C., Worm, E. S. and Williams, E. R. On the Survival of Peptide Cations After Electron Capture: Role of Internal Hydrogen Bonding and Microsolvation. Journal of the American Society for Mass Spectrometry. 2006, 17, 1675-1680. web

2005 Publications

• Wong, R. L., Williams, E. R., Counterman, A. E. and Clemmer, D. E. Evaluation of ion mobility spectroscopy for determining charge-solvated versus salt-bridge structures of protonated trimers. Journal of the American Society for Mass Spectrometry. 2005, 16, 1009-1019. web
• Robinson, E. W. and Williams, E. R. Multidimensional Separations of Ubiquitin Conformers in the Gas Phase: Relating Ion Cross Sections to H/D Exchange Measurements. Journal of the American Society for Mass Spectrometry. 2005, 16, 1427-1437. web
• Lemoff, A. S., Bush, M. F. and Williams, E. R. Structures of cationized proline analogues: Evidence for the Zwitterionic form. Journal of Physical Chemistry A. 2005, 109, 1903-1910. web
• Lemoff, A. S., Bush, M. F., Wu, C. C. and Williams, E. R. Structures and hydration enthalpies of cationized glutamine and structural analogues in the gas phase. Journal of the American Chemical Society. 2005, 127, 10276-10286. web

2004 Publications

• Wong, R. L., Robinson, E. W. and Williams, E. R. Activation of Protonated Peptides and Molecular Ions of Small Molecules Using Heated Filaments in Fourier-Transform Ion Cyclotron Resonance Mass Spectrometry. International Journal of Mass Spectrometry. 2004, 234, 1-9. web
• Wong, R. L., Paech, K. and Williams, E. R. Blackbody Infrared Radiative Dissociation at Low Temperature: Hydration of X²⁺(H₂O)_n, for X = Mg, Ca. International Journal of Mass Spectrometry. 2004, 232, 59-66. web
• Williams, E. R., Jurchen, J. C., Garcia, D. E., Lemoff, A. S. and Bush, M. F. Noncovalent Biomolecule Complexes Both Large and Small. Advances in Mass Spectrometry. 2004, 16, 79-94.
• Lemoff, A. S. and Williams, E. R. Binding energies of water to lithiated valine: Formation of solution-phase structure in vacuo. Journal of the American Society for Mass Spectrometry. 2004, 15, 1014-1024. web
• Iavarone, A. T., Udekwu, O. A. and Williams, E. R. Buffer loading for counteracting metal salt-induced signal suppression in electrospray ionization. Analytical Chemistry. 2004, 76, 3944-3950. web
• Jurchen, J. C., Garcia, D. E. and Williams, E. R. Further studies on the origins of asymmetric charge partitioning in protein homodimers. Journal of the American Society for Mass Spectrometry. 2004, 15, 1408-1415. web
• Iavarone, A. T., Paech, K. and Williams, E. R. The Effects of Charge State and Cationizing Agent on the Electron Capture Dissociation of a Peptide. Analytical Chemistry. 2004, 76, 2231-2238. web

2003 Publications

• Wong, R. L. and Williams, E. R. Dissociation of SO4^2-(H₂O)_n clusters, n=3-17. Journal of Physical Chemistry A. 2003, 107, 10976-10983. web
• Paech, K., Jockusch, R. A. and Williams, E. R. Slow infrared laser dissociation of biomolecules in the rapid energy exchange limit (vol 106A, pg 9763, 2002). Journal of Physical Chemistry A. 2003, 107, 2596-2596. web
• Lemoff, A. S., Bush, M. F. and Williams, E. R. Binding energies of water to sodiated valine and structural isomers in the gas phase: The effect of proton affinity on zwitterion stability. Journal of the American Chemical Society. 2003, 125, 13576-13584. web
• Iavarone, A. T. and Williams, E. R. Mechanism of charging and supercharging molecules in electrospray ionization. Journal of the American Chemical Society. 2003, 125, 2319-2327. web
• Kelley, W. P., Wolters, A. M., Sack, J. T., Jockusch, R. A., Jurchen, J. C., Williams, E. R., Sweedler, J. V. and Gilly, W. F. Characterization of a novel gastropod toxin (6-bromo-2-mercaptotryptamine) that inhibits shaker K channel activity. Journal of Biological Chemistry. 2003, 278, 34934-34942. web
• Jurchen, J. C. and Williams, E. R. Origin of asymmetric charge partitioning in the dissociation of gas-phase protein homodimers. Journal of the American Chemical Society. 2003, 125, 2817-2826. web
• Jurchen, J. C., Cooper, R. E. and Williams, E. R. The role of acidic residues and of sodium ion adduction on the gas-phase H/D exchange of peptides and peptide dimers. Journal of the American Society for Mass Spectrometry. 2003, 14, 1477-1487. web
• Jurchen, J. C., Garcia, D. E. and Williams, E. R. Gas-phase dissociation pathways of multiply charged peptide clusters. Journal of the American Society for Mass Spectrometry. 2003, 14, 1373-1386. web
• Iavarone, A. T. and Williams, E. R. Collisionally activated dissociation of supercharged proteins formed by electrospray ionization. Analytical Chemistry. 2003, 75, 4525-4533. web

2002 Publications

• Williams, E. R. and Wysocki, V. H. Special issue: Structure of biological molecules - Foreword. International Journal of Mass Spectrometry. 2002, 219, VII-VIII. web
• Paech, K., Jockusch, R. A. and Williams, E. R. Slow infrared laser dissociation of molecules in the rapid energy exchange limit. Journal of Physical Chemistry A. 2002, 106, 9761-9766. web
• Iavarone, A. T. and Williams, E. R. Supercharging in electrospray ionization: effects on signal and charge. International Journal of Mass Spectrometry. 2002, 219, 63-72. web

2001 Publications

• Strittmatter, E. F. and Williams, E. R. The role of proton affinity, acidity, and electrostatics on the stability of neutral versus ion-pair forms of molecular dimers. International Journal of Mass Spectrometry. 2001, 212, 287-300. web
• Rodriguez-Cruz, S. E. and Williams, E. R. Gas-phase reactions of hydrated alkaline earth metal ions, M2+(H2O)(n) (M = Mg, Ca, Sr, Ba and n=4-7), with benzene. Journal of the American Society for Mass Spectrometry. 2001, 12, 250-257. web
• Jockusch, R. A., Lemoff, A. S. and Williams, E. R. Hydration of valine-cation complexes in the gas phase: On the number of water molecules necessary to form a zwitterion. Journal of Physical Chemistry A. 2001, 105, 10929-10942. web
• Jockusch, R. A., Lemoff, A. S. and Williams, E. R. Effect of metal ion and water coordination on the structure of a gas-phase amino acid. Journal of the American Chemical Society. 2001, 123, 12255-12265. web
• Iavarone, A. T., Jurchen, J. C. and Williams, E. R. Supercharged protein and peptide lone formed by electrospray ionization. Analytical Chemistry. 2001, 73, 1455-1460. web

2000 Publications

• Strittmatter, E. F., Wong, R. L. and Williams, E. R. Gas-phase basicity of (CH3)(3)N+-C6H4-COO- zwitterions: A new class of organic super bases. Journal of the American Chemical Society. 2000, 122, 1247-1248. web
• Strittmatter, E. F. and Williams, E. R. Structures of protonated arginine dimer and bradykinin investigated by density functional theory: Further support for stable gas-phase salt bridges. Journal of Physical Chemistry A. 2000, 104, 6069-6076. web
• Strittmatter, E. F., Lemoff, A. S. and Williams, E. R. Structure of cationized glycine, gly center dot M2+ (M = Be, Mg, Ca, Sr, Ba), in the gas phase: Intrinsic effect of cation size on zwitterion stability. Journal of Physical Chemistry A. 2000, 104, 9793-9796. web
• Strittmatter, E. F., Wong, R. L. and Williams, E. R. Effects of gas-phase basicity on the proton transfer between organic bases and trifluoroacetic acid in the gas phase: Energetics of charge solvation and salt bridges. Journal of Physical Chemistry A. 2000, 104, 10271-10279. web
• Jockusch, R. A., Paech, K. and Williams, E. R. Energetics from slow infrared multiphoton dissociation of biomolecules. Journal of Physical Chemistry A. 2000, 104, 3188-3196. web
• Iavarone, A. T., Jurchen, J. C. and Williams, E. R. Effects of solvent on the maximum charge state and charge state distribution of protein ions produced by electrospray ionization. Journal of the American Society for Mass Spectrometry. 2000, 11, 976-985. web

pre-2000 Publications

Site created and maintained by Matthew F. Bush.