John Bartmess's Chemistry Homepage

Link to Exact Mass of the Elements project for ASMS Measurements & Standards committee.

Chemistry 553 Graduate Organic Chemistry Fall 2007 Mass Spec lectures

Born: Cincinnati OH, 11 Nov 1948
Business Phone: (865) 974-6578
Business Fax: (865) 974-3454
Email: bartmess@utk.edu

Education

Secondary: Anderson High School, Cincinnati OH, 1966
Undergraduate: Rice University, Houston, TX, B.A. (Chemistry/ACS Certified) 1970
Graduate: Northwestern University, Evanston IL. Ph.D. (Organic Chemistry) 1975, Professor F.G. Bordwell, Research Advisor

Academic Positions

Instructor, Organic Chemistry, Northwestern University, 1974-1975
Postdoctoral Research, University of California Irvine, Irvine CA, with Professor R.T. McIver, Jr., 1975-1977
Assistant Professor, Department of Chemistry, Indiana University, Bloomington IN, Aug 1977 - July 1984
Department of Chemistry, University of Tennessee, Knoxville TN,
     Assistant Professor, Aug 1984 - Jul 1986
     Associate Professor, Aug 1986 - Aug 1993
     Professor, Sept 1993 -

Professional Societies and Activities

American Chemical Society (ACS), 1971-
  East Tennessee Section, ACS
    Secretary, 1985-86
    Alternate Councilor, 1990-92
    Nominating Committee, 1996,1999,2000
    Member-at-Large, 1997-99
American Society for Mass Spectrometry (ASMS), 1976-
  Measurements and Standards Committee, ASMS 1991-2001,2004-
  Chair, Fundamentals Interest Group, ASMS, 1993-95,2003-05
  Manager, Listserver, Mass Spectrometry Discussions Groups, 1994-95
East Tennessee Mass Spectrometry Discussion Group 1989-
  President, 1992-94
  Treasurer, 2001-2005
Alpha Chi Sigma 1980-
Editor, "Current Awareness Profile on Gas Phase Ion/Molecule Reactions", 1978-1993.
List Manager, mailing of Usenet group sci.techniques.mass-spec 1995-

Fields of Research Interest

Gas phase ion/molecule reactions
Negative Ion thermochemistry Solvation thermochemistry & heats of formation by solution calorimetry
including maintenance of the NIST Webbook data on gas phase negative ions.
Computational chemistry, especially of negative ions
Generation of negative ions by electron attachment/dissociative attachment
Reaction mechanisms
Instrumentation development of ICR spectrometry
Development of Fast Atom Bombardment mass spectrometry, using electrochemical techniques
Safety and environmental issues in chemistry, especially dealing with hazardous waste releases to the environment

Abstract of Current Research Efforts

The goal of my research program is to gain insight into the role of the solvent in determining how chemicals react. When analyzing structure- reactivity relationships, chemists have a tendency to consider only the simple valence bond pictures of the reactants, that we can draw easily, and often will ignore solvent effects unless forced to consider them by the evidence. We are investigating the effect of both aspects, by examining "well-known" condensed phase reactions in the gas phase, where no solvent is present. It turns out the the large effects of solvents (and counter-ions) are on reactions of ions.

To examine such reactions, we use a modified mass spectrometer, called an ion cyclotron resonance (ICR) spectrometer. This allows gaseous ions to be trapped in a magnetic field for milliseconds to seconds, allowing them to bump into neutral molecules and react to form other ions and neutrals. We have shown that some reactions have the same mechanisms in the gas phase as in solution, while other reactions require at least one molecule of solvent to occur. Extensive scales of gas phase acidities and hydrogen bonding strengths have been measured.

Computational chemistry is used as an additional tool to explain and interpret the experimental results. Solution calorimetry is used to relate the gas phase thermochemistry to the condensed phase, obtaining ionic heats of solvation. Development of the ICR instrumentation, involving better methods of pressure measurement at the ICR cell, and more accurate methods of determining ion intensity, is underway.

List of Publications

List of Presentations