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Creator | Title | Description | Subject | Date |
176 |
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Miller, Joel Steven | Synthesis of layered (2-D) V-based bimetallic oxalates from non-aqueous media that cannot be synthesized from aqueous media | The reaction of (NBu4)3[VIII(ox)3] (1, ox = oxalate) and M(II) (M= Fe, Co, Ni, Cu) ions in MeCN, leads to the isolation of V-based coordination polymers of [N(n-Bu)4][FeIIVIII(ox)3]? 0.30{[N(n-Bu)4](BF4)} (2), [N(n-Bu)4][CoIIVIII(ox)3]?0.75{[N(n-Bu)4](BF4)} (3), [N(n-Bu)4][NiIIVIII(ox)3]?0.20{[N(n... | Magnetic; Coupling; Diffraction | 2006 |
177 |
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Morse, Michael David | Optical spectroscopy of tungsten carbide (WC) | Resonant two-photon ionization spectroscopy has been used to study the diatomic transition-metal carbide, WC. A low-resolution scan revealed a five-member vibrational progression beginning with the 0-0 band at 17 585 cm-1. Analysis of this progression yielded a vibrational frequency of ?'e8(184W12C)... | | 2002 |
178 |
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Morse, Michael David | Rotationally resolved spectroscopy of jet-cooled NbMo | Rotationally resolved resonant two-photon ionization spectra of jet-cooled NbMo are reported for the first time. A vibronic spectrum of NbMo was recorded in the 17 300?22 300 cm?1 spectral region. Although the observed bands could not be grouped into electronic band systems, four excited vibronic le... | | 2007 |
179 |
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Morse, Michael David | Interaction of an aluminum atom with an alkaline earth atom: spectroscopic and ab initio investigations of AICa | A spectroscopic analysis of diatomic AlCa generated by laser vaporization of a 2:1 AI:Ca metal alloy followed by supersonic expansion has been completed using resonant two-photon ionization spectroscopy. Four excited electronic states have been identified and investigated in the energy region from 1... | | 1994 |
180 |
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Armentrout, Peter B. | C+(2P)+H2(D2,HD)→CH+(CD+)+H(D). I. Reaction cross sections and kinetic isotope effects from threshold to 15eV c.m. | Total cross sections for the reactions of carbon (1 + ) ions with isotopic molecular hydrogen (H2, D2, and HD) to form methyliumylidene (CH+ and CD+) have been measured using guided ion beam techniques. Cross sections are reported as a function of the translational energy of the reactants from th... | Methyliumylidene; Endothermic reactions; Isotope effect; Threshold energy | 1986 |
181 |
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Poulter, Charles Dale | Farnesyl diphosphate synthetase: molecular cloning, sequence, and expression of an essential gene from Saccharomyces cerevisiae | Farnesyl diphosphate (FPP) synthetase is a key enzyme in isoprenoid biosynthesis which supplies C15 precursors for several classes of essential metabolites including sterols, dolichols, and ubiquinones. The structural gene for FPP synthetase was isolated on a 4.5-kilobase EcoRI genomic restriction f... | Genetics; Transferases; Dimethylallyltranstransferase/biosynthesis | 1989-11-15 |
182 |
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Morse, Michael David | Resonant two-photon ionization spectroscopy of coinage metal trimers: Cu?Ag, Cu?Au, and CuAgAu | The jet-cooled coinage metal triatomic molecules Cu, Ag, Cu, Au, and CuAgAu have been investigated using resonant two-photon ionization spectroscopy. One band system, labeled as the ?-x system, has been observed for each species, with origin bands at 13 188, 17 217, and 17 470 cm -?, respectively. ... | | 1991 |
183 |
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Miller, Joel Steven; Epstein, Arthur J. | Complex ac susceptibility studies of the disordered molecular based magnets V(TCNE)x: role of spinless solvent | The effect of different spinless solvents on the magnetism of V(TCNE)x . y(solvent) (TCNE= tetracyanoethylene) is studied by temperature (T) dependent ac susceptibility above 2.3 K. Though V(TCNE)x.y(CH2Cl2) has a critical temperature Tc -400 K, for V(TCNEx.y(C4H8O), Tc -205 K and the coercive field... | Magnetization; Spin; Temperature | 1993 |
184 |
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Armentrout, Peter B. | Threshold collision-induced dissociation of Sr2+ (H2 O) x complexes (x=1-6): an experimental and theoretical investigation of the complete inner shell hydration energies of Sr2+ | The sequential bond energies of Sr2+(H2O)x complexes, where x=1-6, are determined by threshold collision-induced dissociation using a guided ion beam tandem mass spectrometer equipped with an electrospray ionization source. The electrospray source produces an initial distribution of Sr2+(H2O)x compl... | | 2010 |
185 |
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Morse, Michael David | Resonant two-photon ionization spectroscopy of jet-cooled PdSi | The spectra of diatomic PdSi have been investigated for the first time, using the technique of resonant two-photon ionization spectroscopy. A number of vibronic transitions have been observed in the 20 400?22 000 cm?1 range. It is difficult to group the bands into band systems, although one likely... | | 2011 |
186 |
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Miller, Joel Steven; Epstein, Arthur J. | Optical properties of the 1:2 compound of dimethylferrocenium with tetracyanoquinodimethanide: [(Me2Fc)(TCNQ)2] | We present the results of a study of the room-temperature polarized reflectance of (1:2) 1,1'-dimethylferrocenium ditetracyanoquinodimethanide [(Me2Fc)(TCNQ)2] over the range between the far infrared and the near ultraviolet. Kramers-Kronig analysis of the reflectance is used to determine the optica... | Reflectance; Electrons ; Molecules | 1987 |
187 |
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Armentrout, Peter B. | Guided ion-beam studies of the reactions of Con + (n=2-20) with O2: cobalt cluster-oxide and -dioxide bond energies | The kinetic-energy dependence for the reactions of Con + (n=2-20) with O2 is measured as a function of kinetic energy over a range of 0 to 10 eV in a guided ion-beam tandem mass spectrometer. A variety of Com+ , ComO+, and ComO2 + (m<n) product ions is observed, with the dioxide cluster ions domina... | Metal clusters; Cobalt ions; Collision-induced dissociation; Bond energies; Exothermic reactions; Endothermic reactions | 2005 |
188 |
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Armentrout, Peter B. | Threshold behavior of endothermic reactions: C+(2P) + H2 → CH+ + H | The reaction C+(2p) + H2 → CH+ + H (1) and its deuterium analog is a model system in ion-molecule chemistry. It is of interest due to its astrophysical significance, because it is an endothermic process, and because the interaction involves several potential energy surfaces. Experimental work ha... | Endothermic reactions; Translational energy; Threshold behavior | 1984 |
189 |
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Armentrout, Peter B. | Methane activation by nickel cluster cations, Nin+ (n=2-16): reaction mechanisms and thermochemistry of cluster-CHx (x=0-3) complexes | The kinetic energy dependences of the reactions of Nin+ (n=2-16) with CD4 are studied in a guided ion beam tandem mass spectrometer over the energy range of 0-10 eV. The main products are hydride formation NinD1, dehydrogenation to form NinCD2 1 , and double dehydrogenation yielding NinC1. | Nickel ions; Metal clusters; Deuterated methane; Collision-induced dissociation; Endothermic reactions; Bond energies; Dehydrogenation | 2004 |
190 |
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Miller, Joel Steven; Epstein, Arthur J. | Ferromagnetism in molecular materials: decamethylferrocenium tetracyanoethanide [DMeFc][TCNE] (invited) | Ferromagnetism has only recently been observed in molecular materials. We present here a summary of the ferromagnetic phenomena observed in the molecular charge transfer salt, decamethylferrocenium tetracyanoethanide (DMeFc) (TCNE), and related compounds. A spontaneous magnetization is observed i... | Magnetic; Magnetization | 1988 |
191 |
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Miller, Joel Steven; Epstein, Arthur J. | Tetracyanoethylene-based organic magnets | Several classes of organic magnets based upon the tetracyanoethenide radical anion, [TCNE](.-), either unbound, (u), and (u4) bonded to zero, two and four metal sites have been reported. The putative (u4) bonded V(TCNE)x room temperature magnet has been extended to include M(TCNE)x(M = Mn, Fe, Co,... | Magnetization; Magnetic ordering; Oxidation | 1998 |
192 |
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Armentrout, Peter B. | Hydrogen atom transfer reactions of He+ and Ne+ with H2, D2, and HD | The hydrogen atom transfer reactions of helium (1 +) and neon(1+) ions with isotopic molecular hydrogen (H2 , D2 , and HD) are investigated using guided ion beam techniques. These reactions are exothermic, but are known to be extremely slow at thermal energies. The cross sections for formation of... | Transfer reactions; Ion-molecule reactions; Exothermic reactions; Hydrogen; Helium ions; Neon ions; Threshold behavior; Isotope effects | 1987 |
193 |
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Morse, Michael David | Resonant two-photon ionization spectroscopy of jet-cooled OsN: 520?418 nm | The optical transitions of supersonically cooled OsN have been investigated in the range from 19 200 to 23 900 cm?1 using resonant two-photon ionization spectroscopy. More than 20 vibronic bands were observed, 17 of which were rotationally resolved and analyzed. The ground state is confirmed to be 2... | | 2011 |
194 |
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Miller, Joel Steven; Epstein, Arthur J. | Solitons in nearly commensurate organic charge transfer crystals | X-ray diffuse scattering, magnetic, and conductivity studies of (N-methylphenazinium)x (phenazine)1-x (tetracyanoquinodimethan) [(NMPx(Phen)1-x (TCNQ)] show the formation of defect states for 0.50≤x≤0.54. These results are in agreement with the formation of solitons in a highly correlated quasi-... | Charge-transfer salts | 1983 |
195 |
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Morse, Michael David | Rotationally resolved spectra of jet-cooled VMo | The Author's report the first gas-phase spectroscopic investigation of diatomic vanadium molybdenum (VMo). The molecules were produced by laser ablation of a VMo alloy disk and cooled in a helium supersonic expansion. The jet-cooled VMo molecules were studied using resonant two-photon ionization sp... | | 2007 |
196 |
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Morse, Michael David | Electronic structure of the 4 d transition metal carbides: dispersed fluorsecence spectroscopy of MoC, RuC, and PdC | Dispersed fluorescence studies of the diatomic molecules MoC, RuC, and PdC are reported. New states identified in MoC and RuC are the [...]2??12??, ?,??? states and the [...]2??12??, ??? state, respectively. Five states are observed by dispersed fluorescence in PdC. The ground state is found to be [... | | 2011 |
197 |
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Armentrout, Peter B. | Guided ion beam studies of the reactions of Nin+ (n=2-18) with O2: nickel cluster oxide and dioxide bond energies | The kinetic energy dependences of the reactions of Nin + (n=2 - 18) with O2 are studied in a guided ion beam tandem mass spectrometer. A variety of NimO2+, NimO+, and Nim+ product ions, where m<n, are observed, with the dioxide cluster ions dominating the products for all larger reactant cluster io... | Metal clusters; Nickel oxide; Nickel dioxide; Bond energies; Collision-induced dissociation; Exothermic reactions | 2003 |
198 |
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Wight, Charles Albert | Thermal analysis of high explosives: liquid state decomposition of RDX | Nonisothermal thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) have been applied to the thermal decomposition of RDX. Model-free isoconversional analysis of TGA and DSC traces show that RDX primarily evaporates in an open pan with an activation energy of Eα -100 kJ ... | RDX; Plastic explosives; Decomposition; Thermogravimetric analysis; Differential scanning calorimetry | 2000 |
199 |
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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 |
200 |
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Miller, Joel Steven; Epstein, Arthur J. | Ferromagnetic behavior of decamethylchromocenium tetracyanoethenide, [CrCp*2][TCNE] | Studies on the magnetic properties of decamethylchromocenium tetracyanoethanide, [CrCp*2][TCNE] are reported herein. Near-zero field (H= 150 mG) data indicates a ferromagnetic transition with T(c)=3.65 K. The temperature dependence below T(c) can be fit to a mean-field result M=M(o)(1 - T(o))(1/2)... | Magnetic; Magnetization; Transition | 1993 |