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Creator | Title | Description | Subject | Date |
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Armentrout, Peter B. | Collision-induced dissociation of Fen+ (n=2-10) with Xe: ionic and neutral iron binding energies | Cross sections for collision-induced dissociation (CID) of Fen+ with Xe, 2≤n≤10, are presented. Experiments were performed on a newly constructed guided ion beam mass spectrometer, the design and capabilities of which are described in detail. The single mechanism for dissociation of iron cluster... | | 1989 |
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Morse, Michael David | Laser excitation spectroscopy of the A and B states of jet-cooled copper dimer: evidence for large electronic isotope shifts | Fluorescence excitation spectra recorded for the A-X system of jet-cooled Cu2 show conclusive evidence of a ?? = 0 transition, and the A state is thereby definitively assigned as ??u+. A previous assignment of the B state as ??u+ is confirmed, but the vibrational levels of this state are complicated... | | 1989 |
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Miller, Joel Steven; Epstein, Arthur J. | Optical properties of quinolinium tetracyanoquinodimethanide, [Qn(TCNQ)2] and (N-methylphenazinium)x(phenazine)1-x (tetracyanoquinodimethane) [(NMP)x(Phen)1-x(TCNQ)] | We present here optical-absorption data of quinolinium ditetracyanoquinodimethanide [Qn(TCNQ)2] and (N-methylphenazinium)x(phenazine)1-x(tetracyanoquinodimethanide) [(NMP)x(Phen)1-x(TCNQ)] for 0.5 <_x<_ 0.6. These materials span the range of electronic structure from commensurate, to commensurate ... | Commensurate; Lattice; Electron | 1989 |
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Armentrout, Peter B. | Oxidation reactions at variably sized transition metal centers: Fen+ and Nbn+ + O2 (N=1-3) | Cross sections for the reactions of Fen+ and Nbn+ (n = 1-3) with 02 are measured as a function of kinetic energy over a range of 0 to > 10 eV. In all systems, analysis yields insight into the kinetics and thermochemistry of the oxidation processes. Nbn+ reaction with 02 exothermically near the Lange... | Metal clusters; Nobium ions; Iron ions; Exothermic reactions | 1989 |
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Armentrout, Peter B. | Reactions of Ar+, Ne+, and He+ with SiF4 from thermal energy to 50 eV c.m. | Guided ion-beam techniques are used to measure the cross sections for reaction of SiF4 with Ar+, Ne+, and He+ from thermal to 50 eV. Charge transfer followed by loss of F atoms are the sole processes observed. All SiFx + (x = 0-4) products are observed, except for SiF4 + from reaction with Ne+ and ... | Ion-molecule reactions; Tetrafluorosilane; Rare gas ions; Endothermic reactions; Plasma systems | 1989 |
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Morse, Michael David | Resonant two-photon ionization spectroscopy of jet-cooled NiPt | Resonant two-photon ionization spectroscopy of jet-cooled NiPt has been used to investigate the possibility of <f-electron contributions to the bonding in this species. Based on an abrupt onset of predissociation, the bond strength of NiPt is assigned as D0 (NiPt) = 2.798 ? 0.003 eV. Comparisons of ... | | 1989 |
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Miller, Joel Steven; Epstein, Arthur J. | Specific heat of decamethylferrocenium tetracyanoethanide (DMeFc)(TCNE) | We report the specific heat C(T) of (DMeFc)(TCNE) for temperatures 3 K < T < 50 K. We observe an anomaly at Tc-4.82 K corresponding to a transition to a three-dimensional (3D) macroscopic ferromagnet. A broad maximum at = 15 K corresponds to an exchange interaction of J = 35 K along the chain axis. ... | Temperature; Ferromagnetic; Magnetic | 1989 |
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Morse, Michael David | Spectroscopy and electronic structure of jet-cooled GaAs | An optical spectrum, obtained by resonant two-photon ionization spectroscopy, is reported for jet-cooled diatomic gallium arsenide. The ground state is identified as X??-, deriving from a ??rr? molecular configuration, and is characterized by ?" = 215 cm-1, ?"exe" = 3 cm-1, and r0' = 2.53 ? 0.02 ?. ... | | 1989 |
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Armentrout, Peter B. | Spin-orbit state-selected reactions of Xe+(2P3/2 and 2P1/2) with H2, D2, and HD | Spin-orbit state-selected reactions of X e + (2Pj ), j = 3/2 and 1/2, with isotopic molecular hydrogen (H2 , D2 , and HD) to form X e H + and XeD + are studied using guided ion beam mass spectrometry. Reaction cross sections are determined as a function of reactant kinetic energy from near thermal ... | Spin-orbit; Xenon ions; Hydrogen isotopes; Isotope effects; Ion-molecule reactions | 1989 |
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Miller, Joel Steven | Structural and magnetic characterization of a- and B-2,4-hexadiyne-1,6-diyl Bis(2,2,5,5-tetramethyl-1-oxyl-3-pyrroline-3-carboxylate) and its thermal degradation product | The search for ferromagnetic organic compounds and polymers is the focus of contemporary research.1 - 5 Polymerization of di-iminoxyl diacetylene monomers has been suggested as a means to prepare a high spin potentially ferromagnetically coupled polymers3 and the thermal, photochemical, and glow di... | Ferromagnetic; Magnetization; Polymers | 1989 |