Peter B. Armentrout
PHYSICAL & ANALYTICAL CHEMISTRY
Distinguished Professor and Cannon Fellow
B.S. Case Western Reserve University, 1975
Phone: (801) 581-7885
Office: 3402 HEB-S
Activities & Awards
- Presidential Young Investigator, National Science Foundation, 1984-89
- Alfred P. Sloan Research Fellow, 1986-1990
- Camille and Henry Dreyfus Teacher-Scholar, 1987-1992
- Fellow, AAAS, 1992; APS, 1994; JSPS, 1999
- Buck-Whitney Award, ACS Eastern New York Section, 1993
- University of Utah Distinguished Research Award, 1994
- Mack Memorial Award Lecturer, Dept. of Chem., Ohio State University, 1997
- Biemann Medal, Am. Soc. Mass Spectrometry, 2001
- Utah Award of Chemistry, American Chemical Society, 2002
- Cannon Fellow, Chemistry Department, University of Utah, 2003-present
- Phi Kappa Phi Honor Society, 2004
- Outstanding Alumnus of the Year, Dept. Chem., Case Western Reserve University, 2004
- Field and Franklin Award in Mass Spectrometry, American Chemical Society, 2009
- U of U Rosenblatt Prize for Excellence, 2011
- Editorial Board: current, Int. J. Mass Spectrom., formerly, J. Am. Chem. Soc., J. Chem. Phys., J. Phys. Chem., Organometallics, J. Am. Soc. Mass Spectrom.; J. Cluster Science
Our research provides a detailed understanding of the thermochemistry, kinetics, and dynamics of simple and complex chemical reactions. Our group seeks to understand, from a fundamental viewpoint, reactions involved in biological chemistry, catalysis, surface chemistry, organometallic chemistry, and plasma chemistry. Techniques involved include mass spectrometry, ion beams, molecular beams, laser spectroscopy, and ab initio theory.
Chemistry of state-selected atomic metal ions. Transition metals have an abundance of low-lying electronic states that we have shown for 1st-row metals can have very different reactivity. We have recently developed a novel ion mobility source that should permit such studies to be extended to the 2nd- and 3rd- row metals where spin-orbit interactions become important.
Chemistry of unsaturated organometallic complexes. By varying the number and types of ligands attached to metal ions, we study periodic trends, the influence of ligand substitution, and the effects of metal oxidation state on reactivity. These studies provide quantitative thermodynamic data and qualitative electronic information on unsaturated organometallic complexes: the key intermediates in homogeneous catalysis.
Chemistry of solvated ions. Gas-phase solvated ions are important species in the atmosphere and in aerosols and provide a bridge between phenomena in condensed phases and the gas phase. Detailed experiments on such species yield quantitative information that cannot be obtained easily in the condensed phase.
Thermochemistry of metal ions and protons interacting with biological molecules. Our work includes some of the first measurements of the binding energies of Li+, Na+ K+, and Rb+ with the nucleic acid bases, amino acids, and small peptides. The thermochemistry of protonated peptides is also being examined.
Chemistry of metal cluster ions. Laser vaporization, supersonic expansion techniques generate cold transition metal cluster ions that can be size-selected using mass spectrometry. We measure the thermodynamic stabilities of these clusters and their reactivity with a variety of molecules. These studies provide quantitative data relevant to surface chemistry and heterogeneous catalysis.
Environmental chemistry. A long standing interest has involved an investigation of the thermochemistry of systems having potential importance in the clean up of nuclear waste sites.
Threshold behavior: theory and experiment. A theoretical understanding of the kinetic energy dependence of reaction cross sections is in its infancy. We are developing theoretical models that include application of statistical theories, reaction dynamics, and non-adiabatic effects.
Ab initio theory. We consistently apply ab initio theory to provide structures, molecular parameters, and bond energies for use in the analysis and interpretation of our experimental results.
- 409. "Infrared Spectroscopy of Divalent Zinc and Cadmium Crown Ether Systems" Cooper, T. E.; Carl, D. R.; Oomens, J.; Steill, J. D.; Armentrout, P. B. J. Phys. Chem. A, 2011, 115, 5408-5422. doi: 10.1021/jp202646y
- 411. "Collision-induced Dissociation of MO+ and MO2+ (M = Ta and W): Metal Oxide and Dioxide Cation Bond Energies" Hinton, C. S.; Citir, M.; Manard, M.; Armentrout, P. B. Int. J. Mass Spectrom. (John R. Eyler Honor Issue) 2011, 308, 265- 274. doi:10.1016/j.ijms.2011.06.011
- 413. "Structural Elucidation of Biological and Toxicological Complexes: Investigation of Monomeric and Dimeric Complexes of Histidine with Multiply Charged Transition Metal (Zn and Cd) Cations using IR Action Spectroscopy" Hofstetter, T. E.; Howder, C.; Berden, G.; Oomens, J.; Armentrout, P. B. J. Phys. Chem. B 2011, 115, 12648-12661. doi:10.1021/jp207294b
- 414. "Guided Ion Beam and Theoretical Study of the Reactions of Os+ with H2, D2, and HD" Hinton, C. S.; Citir, M.; Armentrout, P. B. J. Chem. Phys. 2011, 135, 234302. doi:10.1063/1.3669425
- 415. "Infrared Multiple Photon Dissociation Spectroscopy of Cationized Histidine: Effects of Metal Cation Size on Gas-Phase Conformation" Citir, M.; Hinton, C. S.; Oomens, J.; Steill, J. D.; Armentrout, P. B. J. Phys. Chem. A 2012, 116, 1532-1541. doi:10.1021/jp209636a
- 416. "Thermodynamics and Mechanisms of Protonated Diglycine Decomposition: A Computational Study" Armentrout, P. B.; Heaton, A. L. J. Am. Soc. Mass Spectrom. 2012, 23, 621-631. doi:10.1007/s13361-011-0224-7
- 417. "Thermodynamics and Mechanisms of Protonated Diglycine Decomposition: A Guided Ion Beam Study" Armentrout, P. B.; Heaton, A. L. J. Am. Soc. Mass Spectrom. 2012, 23, 632-643. doi:10.1007/s13361-011-0225-6
- 418. "The Simplest b2+ Ion: Determining Its Structure from Its Energetics by a Direct Comparison of the Threshold Collision-induced Dissociation of Protonated Oxazolone and Diketopiperazine" Armentrout, P. B.; Clark, A. A. Int. J. Mass Spectrom. 2012, 316-318, 182-191. doi:10.1016/j.ijms.2012.01.004
- 419. "Experimental investigation of the complete inner shell hydration energies of Ca2+: Threshold collision-induced dissociation of Ca2+(H2O)x complexes (x = 2 - 8)" Carl, D. R.; Armentrout, P. B. J. Phys. Chem. A 2012, 116, 3802-3815. doi:10.1021/jp301446v
- 420. "Metal Cation Dependence of Interactions with Amino Acids: Bond Energies of Cs+ to Gly, Pro, Ser, Thr, and Cys" Armentrout, P. B.; Chen, Y.; Rodgers, M. T. J. Phys. Chem. A 2012, 116, 3989-3999. doi:10.1021/jp3012766