Part I. Fast atom bombardment mass spectrometry: Discrimination effects and matrix chemistry. Part II. High-energy collisional activation of fullerenes and alkaline earth monohalides

Miscellaneous · Wed Jan 01 00:00:00 EST 1992

OSTI ID:5518279

Caldwell, K A

This dissertation describes fundamental studies encompassing two areas of mass spectrometry: fast-atom bombardment (FAB) ionization and collisional activation. Mixture analysis by FAB-MS is hindered by concentration-dependent discrimination arising from differences in surface activity and micelle formation (Chapter 1). The use of a nonpolar matrix, N-dodecanol, reduced the discrimination effects in the analysis of mixtures of saturated fatty acids. The chemical and physical changes that occur in glycerol as a result of fast-atom bombardment were determined from accurate mass measurements and tandem mass spectrometry (Chapter 2). Proton transfer to ambient glycerol molecules from the glycerol radical cation and its fragments is proposed to account for bombardment-induced ion formation from neutral glycerol. The products of high-energy (keV) collisions of fullerene radical cations with noble gases, as well as D[sub 2], N[sub 2], NO, and O[sub 2] were investigated by using a three-sector and a four-sector tandem mass spectrometer (Chapter 3). Atomic target gases and D[sub 2] were captured directly, and the various endohedral ([open quotes]in the cage[close quotes]) complexes were observed as product ions. Analysis of the kinetic energies of the product ions produced from He and D[sub 2] collisions leads to the conclusion that the observed product ions from He and D[sub 2] collisions are fragments of the endohedral complexes. Abundant doubly charged product ions were detected in collisions with N[sub 2], NO, and O[sub 2] target gases, and the second ionization energies of the neutral fullerenes were determined from translational energy loss measurements.

• Research Organization: Nebraska Univ., Lincoln, NE (United States)
• OSTI ID: 5518279
• Resource Relation: Other Information: Thesis (Ph.D.)
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
ALKALINE EARTH METAL COMPOUNDS
MASS SPECTROSCOPY
FULLERENES
HALIDES
ION-MOLECULE COLLISIONS
EXPERIMENTAL DATA
GLYCEROL
ALCOHOLS
CARBON
COLLISIONS
DATA
ELEMENTS
HALOGEN COMPOUNDS
HYDROXY COMPOUNDS
INFORMATION
ION COLLISIONS
MOLECULE COLLISIONS
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
SPECTROSCOPY
400102* - Chemical & Spectral Procedures
360606 - Other Materials- Physical Properties- (1992-)