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Polfer NC, Oomens J, Dunbar RC.  2008.  Alkali metal complexes of the Dipeptides PheAla and AlaPhe : IRMPD spectroscopy. Chem Phys Chem. 9:579-589. Abstract
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Zou S, Oomens J, Polfer NC.  2012.  Competition between diketopiperazine and oxazolone formation in water loss products from protonated ArgGly and GlyArg. International Journal of Mass Spectrometry. 316:12-17. Abstract
Chen X, Tirado M, Steill JD, Oomens J, Polfer NC.  2011.  Cyclic peptide as reference system for b ion structural analysis in the gas phase. Journal of Mass Spectrometry. 46:1011-1015. Abstract
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Polfer NC, Valle JJ, Moore DT, Oomens J, Eyler JR, Bendiak B.  2006.  Differentiation of isomers by wavelength-tunable infrared multiple-photon dissociation-mass spectrometry: Application to glucose-containing disaccharides. Analytical Chemistry. 78:670-679.
Dunbar RC, Steill JD, Polfer NC, Oomens J.  2009.  Dimeric Complexes of Tryptophan with M2+ Metal Ions. Journal of Physical Chemistry A. 113:845-851. Abstract
Tirado M, Rutters J, Chen X, Yeung A, van Maarseveen J, Eyler JR, Berden G, Oomens J, Polfer NC.  2012.  Disfavoring Macrocycle b Fragments by Constraining Torsional Freedom: The "Twisted" Case of QWFGLM b(6). Journal of the American Society for Mass Spectrometry. 23:475-482. Abstract
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Chen X, Yu L, Steill JD, Oomens J, Polfer NC.  2009.  Effect of Peptide Fragment Size on the Propensity of Cyclization in Collision-Induced Dissociation: Oligoglycine b(2)-b(8). Journal of the American Chemical Society. 131:18272-18282. Abstract
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Dunbar RC, Steill JD, Polfer NC, Oomens J.  2009.  Gas-phase infrared spectroscopy of the protonated dipeptides H(+)PheAla and H(+)AlaPhe compared to condensed-phase results. International Journal of Mass Spectrometry. 283:77-84. Abstract
Pagel K, Kupser P, Bierau F, Polfer NC, Steill JD, Oomens J, Meijer G, Koksch B, von Helden G.  2009.  Gas-phase IR spectra of intact alpha-helical coiled coil protein complexes. International Journal of Mass Spectrometry. 283:161-168. Abstract
Dunbar RC, Polfer NC, Oomens J.  2007.  Gas-phase zwitterion stabilization by a metal dication,. Journal of the American Chemical Society. 129
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Contreras CS, Polfer NC, Chung AC, Oomens J, Eyler JR.  2010.  Hydrogen/deuterium exchange of phenylalanine analogs studied with infrared multiple photon dissociation. International Journal of Mass Spectrometry. 297:162-169. Abstract
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Polfer NC, Paizs B, Snoek LC, Compagnon I, Suhai S, Meijer G, von Helden G, Oomens J.  2005.  Infrared fingerprint spectroscopy and theoretical studies of potassium ion tagged amino acids and peptides in the gas phase. Journal of the American Chemical Society. 127:8571-8579.
Polfer NC, Oomens J, Suhai S, Paizs B.  2007.  Infrared spectroscopy and theoretical studies on gas-phase protonated leu-enkephalin and its fragments: Direct experimental evidence for the mobile proton. Journal of the American Chemical Society. 129:5887-5897.
Forbes MW, Bush MF, Polfer NC, Oomens J, Dunbar RC, Williams ER, Jockusch RA.  2007.  Infrared spectroscopy of arginine cation complexes: direct observation of gas-phase zwitterions. Journal of Physical Chemistry A. 111:11759-11770.
Bush MF, Forbes MW, Jockusch RA, Oomens J, Polfer NC, Saykally RJ, Williams ER.  2007.  Infrared spectroscopy of cationized lysine and epsilon-N-methyllysine in the gas phase: Effects of alkali-metal ion size and proton affinity on zwitterion stability. Journal of Physical Chemistry A. 111:7753-7760.
Polfer NC, Oomens J, Moore DT, von Helden G, Meijer G, Dunbar RC.  2006.  Infrared spectroscopy of phenylalanine Ag(I) and Zn(II) complexes in the gas phase. Journal of the American Chemical Society. 128:517-525.
Polfer NC, Oomens J, Dunbar RC.  2006.  IRMPD spectroscopy of metal-ion/tryptophan complexes. Physical Chemistry Chemical Physics. 8:2744-2751.
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Dunbar RC, Steill JD, Polfer NC, Oomens J.  2013.  Metal Cation Binding to Gas-Phase Pentaalanine: Divalent Ions Restructure the Complex. Journal of Physical Chemistry A. 117:1094-1101. Abstract
Dunbar RC, Polfer NC, Berden G, Oomens J.  2012.  Metal ion binding to peptides: Oxygen or nitrogen sites? International Journal of Mass Spectrometry. 330:71-77. Abstract
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Polfer NC, Dunbar RC, Oomens J.  2007.  Observation of Zwitterion formation in the gas-phase H/D-exchange with CH3OD: Solution-phase structures in the gas phase. Journal of the American Society for Mass Spectrometry. 18:512-516.