|
|
Creator | Title | Description | Subject | Date |
251 |
|
Stang, Peter J. | Self-selected formation of single discrete supramolecules with flexible, bidentate ligands in the coordination-driven self-assembly | Flexible donor ligands like 1,2-bis(3-pyridyl)ethyne or 1,4-bis(3-pyridyl)-1,3-butadiyne selfassemble into discrete 2-D supramolecules instead of infinite networks upon combination with organoplatinum 90, 120, and 180 degree acceptor units. These systems are unique examples of versatile pyridine... | Bidentate ligands; Flexible donor ligands; Supramolecules; Coordination-driven self-assembly | 2008 |
252 |
|
Armentrout, Peter B. | Sequential bond energies and barrier heights for the water loss and charge separation dissociation pathways of Cd2+(H2O)n, n 3-11 | The bond dissociation energies for losing one water from Cd2+(H2O)n complexes, n=3?11, are measured using threshold collision-induced dissociation in a guided ion beam tandem mass spectrometer coupled with a thermal electrospray ionization source. Kinetic energy dependent cross sections are obtained... | | 2011 |
253 |
|
Armentrout, Peter B. | The simplest b 2 + ion: determining its structure from its energetics by a direct comparison of the threshold collision-induced dissociation of protonated oxazolone and diketopiperazine | Energy-resolved collision-induced dissociation of b2 + ions derived from protonated GGG and GAG are compared with that of protonated diketopiperazine (H+DKP). Absolute dissociation cross sections are obtained using a guided ion beam tandem mass spectrometer and analyzed using statistical methods. T... | | 2012 |
254 |
|
Armentrout, Peter B. | 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 | Energy-resolved collision-induced dissociation of b2 + ions derived from protonated GGG and GAG are compared with that of protonated diketopiperazine (H+DKP). Absolute dissociation cross sections are obtained using a guided ion beam tandem mass spectrometer and analyzed using statistical methods. Th... | | 2012-01-01 |
255 |
|
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 |
256 |
|
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 |
257 |
|
Morse, Michael David | Spectroscopic analysis of jet-cooled AICu | Diatomic AlCu has been interrogated using resonant two-photon ionization spectroscopy in a supersonic expansion of helium. The ground state is shown to be X l?+, deriving from the 3&3dgd configuration, in agreement with theoretical predictions. The closed-shell nature of this molecule results in a l... | | 1993 |
258 |
|
Morse, Michael David | Spectroscopic analysis of the open 3 d subshell transition metal aluminides: AIV, AICr, and AICo | Three open 3d subshell transition metal aluminides, AlV, AICr, and AlCo, have been investigated by resonant two-photon ionization spectroscopy to elucidate the chemical bonding in these diatomic molecules. The open nature of the 3d subshell results in a vast number of excited electronic states in th... | | 1994 |
259 |
|
Morse, Michael David | Spectroscopic studies of jet-cooled AgAu and Au? | Resonant two-photon ionization spectroscopy has been applied to the jet-cooled Au? and AgAu molecules. Three new band systems of Au? and two new systems of the poorly characterized AgAu molecule have been observed. Excited state lifetime measurements have been made, and assignments of the excited s... | | 1991 |
260 |
|
Morse, Michael David | Spectroscopic studies of jet-cooled AINi | Resonant two-photon ionization spectroscopy has been used to interrogate diatomic AlNi produced by laser vaporization of a 1:l alloy target in a supersonic molecular beam of helium. Although a large density of states in this molecule prohibits a concise elucidation of its electronic structure, the p... | | 1993 |
261 |
|
Morse, Michael David | Spectroscopic studies of jet-cooled CuAg | Resonant two-photon ionization spectroscopy has been applied to jet-cooled diatomic CuAg. Four band systems have been observed, three of which have been rotationally resolved and analyzed. The ground state is X ??+ in symmetry, deriving from the 3d??cu4d??Ag?? molecular configuration. Its bond lengt... | | 1991 |
262 |
|
Morse, Michael David | Spectroscopic studies of the jet-cooled aluminum trimer | Gas phase spectroscopic investigations of the jet-cooled aluminum trimer are reported using the technique of resonant two-photon ionization with mass spectrometric detection. A discrete band system in the 5200-6100 ? region is observed, consisting of an extended vibrational progression in a single ... | | 1987 |
263 |
|
Morse, Michael David | Spectroscopy and electronic structure of jet-cooled Al? | Resonant two-photon ionization spectroscopy has been used to study the jet-cooled Al? molecule. The ground state has been conclusively demonstrated to be of 3IIu symmetry, deriving from the ???rr?u electronic configuration. High resolution studies have established the bond length of the X?IIu state ... | | 1990 |
264 |
|
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 |
265 |
|
Morse, Michael David | Spectroscopy and electronic structure of jet-cooled NiCu | Diatomic nickel-copper, NiCu, has been investigated by resonant two-photon ionization spectroscopy in a jet-cooled molecular beam. Six band systems have been identified over the range 11 500-16 500 cm-1. The ground state of NiCu has been determined to be X 2?5/2, with ?"e = 273.01 ? 1.15 cm-1, ?"exe... | | 1988 |
266 |
|
Morse, Michael David | Spectroscopy and electronic structure of jet-cooled NiPd and PdPt | Resonant two-photon ionization spectroscopy of jet-cooled NiPd and PdPt has revealed a dense vibronic spectrum for NiPd and a much more sparse spectrum for PdPt. Four vibrational progressions have been identified for NiPd, and three have been located for PdPt. High resolution investigations of NiPd... | | 1990 |
267 |
|
Morse, Michael David | Spectroscopy of AlAr and AlKr from 31 000 cm-1 to the ionization limit | Spectra of jet-cooled AlAr and AlKr have been collected over the range from 31 000 cm -? to the ionization limit, using the technique of resonant two-photon ionization spectroscopy with mass spectrometric detection. Adiabatic ionization potentials have been accurately measured for both molecules, an... | | 1992 |
268 |
|
Morse, Michael David | Spectroscopy of diatomic ZrF and ZrCl: 760 ? 555 nm | The optical spectrum of diatomic ZrF has been investigated, with transitions recorded in the range from 14 700 to 18 000 cm?1. Many bands have been observed, several of which can be grouped into three band systems. Rotationally resolved investigations are hampered by perturbations that are rampant ... | | 2011 |
269 |
|
Morse, Michael David | Spectroscopy of mixed early-late transition metal diatomics: ScNi, YPd, and ZrCo | Resonant two-photon ionization spectroscopy has been employed to investigate the spectra of the jet-cooled transition metal diatomics ScNi, YPd, and ZrCo, which are isovalent species which possess ~or are thought to possess! an X 2?+ ground state. Several electronic band systems have been observed f... | | 1994 |
270 |
|
Morse, Michael David | Spectrosopic studies of jet-cooled NiAu and PtCu | Spectroscopic investigations of NiAu and PtCu have revealed that both molecules possess 2?5/2 ground electronic states, and are in this respect analogous to the isovalent molecule NiCu. The ground-state bond lengths (r?) have been measured as 2.351?0.001 ? and 2.335?0.001 ? for NiAu and PtCu, respe... | | 1992 |
271 |
|
Morse, Michael David | Spectrsocopy of Jet-cooled YCu | Optical spectra of jet-cooled diatomic YCu have been recorded using resonant two-photon ionization spectroscopy in a supersonic expansion of helium. The ground state is shown experimentally to be of 1?+ symmetry, with a measured bond length of re"=2.6197(6) ? and a vibrational frequency of 193.21(24... | | 1995 |
272 |
|
Miller, Joel Steven | Spin crossover behavior of [FeII(isoxazole)6][BF4]2--a structural study | [FeII(isoxazole)6][BF4]2 undergoes two reversible spin crossover transitions at 91 and 192 K and the single crystal structure determination reveals two different iron sites, Fe1 and Fe2, in a 1 : 2 ratio, with Fe1 attributed to the 91 K transition, and Fe2 attributed to the 192 K transition. This is... | Transition; Magnetic; Temperature | 1999 |
273 |
|
Miller, Joel Steven; Epstein, Arthur J. | Spin dilution in a ferromagnetic chain | We have systematically introduced spinless defects in the quasi-one-dimensional ferromagnetic system decamethylferrocenium tetracyanoethanide, [FeCp(2*)] [TCNE]. The three-dimensional ordering temperature Tc decreases rapidly with the concentration of spinless sites. The rate of decrease of Tc with... | Magnetic; Magnetization; Spinless | 1992 |
274 |
|
Miller, Joel Steven; Epstein, Arthur J. | Spin frustration and metamagnetic behavior in a molecular-based quasi 1-D-ferrimagnetic chain: (MnTPP)(TCNE) | We report an experimental observation of spin frustration and metamagnetic behavior in a quasi-1D ferrimagnetic chain, (MnTPP) + (TCNE) -. Metastability, hysteresis effects, and irreversibility of thermal and magnetic histories are observed in magnetization measurements. The "memory" phenomenon is ... | Magnetic; Magnetization; Anisotropy | 1993 |
275 |
|
Morse, Michael David | Spin-forbidden c??+??X??+ band system of YF | Optical spectra of jet-cooled diatomic YF have been recorded using resonant two-photon ionization spectroscopy. A vibrational progression corresponding to the c 3?1+?X 1?+ system has been identified. The vibrational frequency ?e' and anharmonicity ?'exe' of the c 3?+ state are 546.70 and 2.45 cm?1,... | | 2007 |