Publications

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Journal Article
N.C Polfer, J. Oomens, R.C DunbarAlkali metal complexes of the Dipeptides PheAla and AlaPhe : IRMPD spectroscopy, ChemPhysChem 49 (2008) 579-589.
S. Zou, J. Oomens, N.C PolferCompetition between diketopiperazine and oxazolone formation in water loss products from protonated ArgGly and GlyArg, Int. J. Mass Spectrom. 316 (2012) 12-17.
X. Chen, M. Tirado, J.D Steill, J. Oomens, N.C PolferCyclic peptide as reference system for b ion structural analysis in the gas phase, J. Mass Spectrom. 46 (2011) 1011-1015.
N.C Polfer, J.J Valle, D.T Moore, J. Oomens, J.R Eyler, B. BendiakDifferentiation of isomers by wavelength-tunable infrared multiple-photon dissociation-mass spectrometry: Application to glucose-containing disaccharides, Analytical Chemistry 378 (2006) 670-679.
R.C Dunbar, J.D Steill, N.C Polfer, J. OomensDimeric Complexes of Tryptophan with M2+ Metal Ions, J. Phys. Chem. A 5113 (2009) 845-851.
M. Tirado, J. Rutters, X. Chen, A. Yeung, J. van Maarseveen, J.R Eyler, G. Berden, J. Oomens, N.C PolferDisfavoring Macrocycle b Fragments by Constraining Torsional Freedom: The "Twisted" Case of QWFGLM b(6), J. Am. Soc. Mass Spectrom. 323 (2012) 475-482.
X. Chen, L. Yu, J.D Steill, J. Oomens, N.C PolferEffect of Peptide Fragment Size on the Propensity of Cyclization in Collision-Induced Dissociation: Oligoglycine b(2)-b(8), J. Am. Chem. Soc. 51131 (2009) 18272-18282.
R.C Dunbar, J.D Steill, N.C Polfer, J. OomensGas-phase infrared spectroscopy of the protonated dipeptides H(+)PheAla and H(+)AlaPhe compared to condensed-phase results, Int. J. Mass Spectrom. 1-3283 (2009) 77-84.
K. Pagel, P. Kupser, F. Bierau, N.C Polfer, J.D Steill, J. Oomens, G. Meijer, B. Koksch, G. von HeldenGas-phase IR spectra of intact alpha-helical coiled coil protein complexes, Int. J. Mass Spectrom. 1-3283 (2009) 161-168.
R.C Dunbar, N.C Polfer, J. OomensGas-phase zwitterion stabilization by a metal dication,, Journal of the American Chemical Society 14562-14563129 (2007) 
C.S Contreras, N.C Polfer, A.C Chung, J. Oomens, J.R EylerHydrogen/deuterium exchange of phenylalanine analogs studied with infrared multiple photon dissociation, Int. J. Mass Spectrom. 1-3297 (2010) 162-169.
N.C Polfer, B. Paizs, L.C Snoek, I. Compagnon, S. Suhai, G. Meijer, G. von Helden, J. OomensInfrared fingerprint spectroscopy and theoretical studies of potassium ion tagged amino acids and peptides in the gas phase, Journal of the American Chemical Society 23127 (2005) 8571-8579.
N.C Polfer, J. Oomens, S. Suhai, B. PaizsInfrared 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 18129 (2007) 5887-5897.
M.W Forbes, M.F Bush, N.C Polfer, J. Oomens, R.C Dunbar, E.R Williams, R.A JockuschInfrared spectroscopy of arginine cation complexes: direct observation of gas-phase zwitterions, Journal of Physical Chemistry A 111 (2007) 11759-11770.
M.F Bush, M.W Forbes, R.A Jockusch, J. Oomens, N.C Polfer, R.J Saykally, E.R WilliamsInfrared 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 32111 (2007) 7753-7760.
N.C Polfer, J. Oomens, D.T Moore, G. von Helden, G. Meijer, R.C DunbarInfrared spectroscopy of phenylalanine Ag(I) and Zn(II) complexes in the gas phase, Journal of the American Chemical Society 2128 (2006) 517-525.
N.C Polfer, J. Oomens, R.C DunbarIRMPD spectroscopy of metal-ion/tryptophan complexes, Physical Chemistry Chemical Physics 238 (2006) 2744-2751.
R.C Dunbar, J.D Steill, N.C Polfer, J. OomensMetal Cation Binding to Gas-Phase Pentaalanine: Divalent Ions Restructure the Complex, J. Phys. Chem. A 117 (2013) 1094-1101.
R.C Dunbar, N.C Polfer, G. Berden, J. OomensMetal ion binding to peptides: Oxygen or nitrogen sites? Int. J. Mass Spectrom. 330–332 (2012) 71-77.
N.C Polfer, R.C Dunbar, J. OomensObservation 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 318 (2007) 512-516.

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