Filters: Publisher:"American Institute of Physics (AIP)" School Or College:"College of Science" Collection:"ir_uspace"
| Title | Creator | Description | Subject | Date | ||
|---|---|---|---|---|---|---|
| 1 |  | Rotational analysis of the 30 1 band of the Ã6Σ+ ← X̃6Σ + system of CrCCH | Morse, Michael David | The spectrum of chromium acetylide, CrCCH, has been investigated in the near-infrared region (10 500-14 500 cm−1) and an intense band system is observed. The 310 band of this system has been investigated at high resolution (0.025 cm−1) and this system is identified as the ˜A6 + ← ˜X6 + syste... | 2014-01-01 | |
| 2 |  | Atomic scale trap state characterization by dynamic tunneling force microscopy | Williams, Clayton C. | Dynamic tunneling force microscopy (DTFM) is applied to the study of point defects in an inter-layer dielectric film. A recent development enables simultaneous acquisition of DTFM, surface potential, and topographic images while under active height feedback control. The images show no clear correlat... | 2014-01-01 | |
| 3 |  | The bond energy of ReO+: Guided ion-beam and theoretical studies of the reaction of Re+ (7S) with O2 | Armentrout, Peter B. | The kinetic-energy dependence of the Re+ + O2 reaction is examined using guided ion-beam mass spectrometry. The cross section for ReO+ formation from ground state Re+ (7S) is unusual, exhibiting two endothermic features. The kinetic energy dependence for ReO+ formation is analyzed to determine D0(Re... | 2013-01-01 | |
| 4 |  | A contribution to the many-fermion problem | Mattis, Daniel C. | In this work we reexamine the many-fermion problem in arbitrary dimensions. It is shown that in two dimensions or higher, the Hamiltonian of interacting fermions can be separated into individual nonintersecting sectors labeled by the wave-vector q. Within each sector the Hamiltonian maps onto a gene... | 2012-01-01 | |
| 5 |  | Magnetic-field dependent differential capacitance of polymer diodes | Rogachev, Andrey | Using admittance spectroscopy, we found that bipolar organic diodes based on pi-conjugated polymer, 2-methoxy-5-(20-ethylhexyloxy), MEH-PPV, have strong divergent contribution to the device differential capacitance. It is positive at low bias voltages, turns negative at intermediate biases, and beco... | 2012-01-01 | |
| 6 |  | Admittance spectroscopy study of polymer diodes in small magnetic fields | Rogachev, Andrey | We performed a systematic study of bipolar and unipolar organic diodes based on the p-conjugated polymer, 2-methoxy-5-(20-ethylhexyloxy) (MEH-PPV), using electronic and magneto-transport measurements with magnetic field in the range 0-180mT and admittance spectroscopy in the frequency range 1 Hz<f<1... | 2012-01-01 | |
| 7 |  | The lsing model and critical behavior of transport in binary composite media | Golden, Kenneth M. | We present a general theory for critical behavior of transport in binary composite media. The theory holds for lattice and continuum percolation models in both the static case with real parameters and the quasi-static case (frequency dependent) with complex parameters. Through a direct, analytic cor... | 2012-01-01 | |
| 8 |  | Probing the electrode-polymer interface in conjugated polymer devices with surface-enhanced Raman scattering | Lupton, John Mark | A crucial consideration in organic devices is the role of the interface between a metal electrode and the active polymer material. Here, we use the conjugated polymer poly[2-methoxy-5-(2-ethylhexyl-oxy)-1,4-phenylene-vinylene] (MEH-PPV) with model gold and silver electrodes to perform surface-enhanc... | 2012-01-01 | |
| 9 |  | Guided ion beam and theoretical study of the reactions of Hf+ with H2, D2, and HD | Armentrout, Peter B. | The kinetic energy dependences of reactions of the third-row transition metal cation Hf+ with H2, D2, and HD were determined using a guided ion beam tandem mass spectrometer. A flow tube ion source produces Hf+ in its 2D (6s25d1) electronic ground state level. Corresponding state-specific reaction c... | 2010-01-01 | |
| 10 |  | Self-switching Q-damping circuit for reducing transmitter ringdown time in high power pulse NMR | Ailion, David Charles | In this paper we describe a circuit for reducing the transmitter ringdown time and thereby improving the recovery time in pulse NMR experiments. The circuit uses only solid state devices and requires no external switching. For transmitter voltages less than 0.5 V peak to peak the effective resista... | Circuits; NMR experiments; Rf pulse | 1970 |
| 11 |  | Quantitative assessment of the accuracy of centroid molecular dynamics for the calculation of the infrared spectrum of liquid water | Voth, Gregory Alan | A detailed analysis of the infrared lineshapes corresponding to the intramolecular bond vibrations of HOD in either H2O or D2O is presented here in order to quantitatively assess the accuracy of centroid molecular dynamics in reproducing the correct features of the infrared spectrum of water at amb... | 2010 | |
| 12 |  | Quantitative two-dimensional dopant profile measurement and inverse modeling by scanning capacitance microscopy | Williams, Clayton C.; Huang, Yufeng | Quantitative dopant profile measurements are performed on a nanometer scale by scanning capacitance microscopy (SCM). An atomic force microscope is used to position a nanometer scale tip at a semiconductor surface, and local capacitance change is measured as a function of sample bias. A new feedback... | Dopant profile; Capacitance change; Scanning capacitance microscopy; Feedback control | 1995 |
| 13 |  | Quest for a polymeric ferromagnet: a new polymorph of 1,4-bis(2,2,6,6-tetramethyl-4-oxy-4-piperidyl-1-oxy)butadiyne (invited) | Miller, Joel Steven; Epstein, Arthur J. | A new polymorph of 1,4-bis(2,2,6,6-tetramethyl-4-oxy-4-piperidyl-l-oxy) butadiyne has been prepared and characterized by x-ray diffraction, infrared and Raman spectroscopies, and magnetic susceptibility. Unlike t h e Pccn-a phase, the B phase belongs to the Pca2y1 space group [a = 14.265(1) A(o),b ... | Molecular; Magnetic; Thermal | 1988 |
| 14 |  | Direct ab initio dynamics studies of N + H2<-->NH + H reaction | Truong, Thanh | Kinetics of the N+H2<-->NH+H reaction have been studied using a direct ab initio dynamics method. Potential energy surface for low electronic states have been explored at the QCISD/ cc-pVDZ level of theory. We found the ground-state reaction is N(4S)+H2-->NH(3Σ-)+H. Thermal rate constants for this ... | Ab initio dynamics; Potential energy surfaces; Minimum energy path; Ground-state reaction; Rate constants | 2000 |
| 15 |  | Direct comparison of cross-sectional scanning capacitance microscope dopant profile and vertical secondary ion-mass spectroscopy profile | Williams, Clayton C.; Huang, Yufeng | The scanning capacitance microscope (SCM) has been shown to be useful for quantitative 2D dopant profiling near the surface of silicon. An atomic force microscope is used to position a nanometer scale tip at a silicon surface, and local capacitance change is measured as a function of sample bias. A ... | Oxide capacitance; Dopant profile; Oxide layer; Scanning capacitance microscopy | 1996-01 |
| 16 |  | Direct imaging of SiO2 thickness variation on Si using modified atomic force microscope | Williams, Clayton C. | Fabrication techniques of metal-oxide-semiconductor ~(MOS) transistors have been improved very rapidly during the last several decades. With this trend, scaling down of MOS transistors is necessary to improve the speed of circuits and the packing density of discrete devices. Both lateral and vertic... | Silicon dioxide; Oxide layer; Phosphorus ions; Oxide capacitance; Dopant profile | 1996-03-01 |
| 17 |  | Directional emission from asymmetric microlaser resonators of ∏-conjugated polymers | Vardeny, Zeev Valentine | A ∏-conjugated polymer film was fabricated into an asymmetric microlaser resonator having a quadrapole deformation with irregular boundaries and a Q factor of 600. At high excitation intensities above the threshold for lasing, we observed multimode laser emission spectra and directional emission a... | Directional emission; Asymmetric microlaser resonators; pi-conjugated polymers; DOO-PPV; poly(dioctyloxy) phenylene vinylene | 2004 |
| 18 |  | 3He spin exchange cells for magnetic resonance imaging | Saam, Brian | We present a protocol for the consistent fabrication of glass cells to provide hyperpolarized (HP) 3He for pulmonary magnetic resonance imaging. The method for producing HP 3He is spin-exchange optical pumping. The valved cells must hold of order 1 atm.L of gas at up to 15 atm pressure. Because char... | 3He; Spin exchange cells; Hyperpolarized 3He; Pulmonary magnetic resonance imaging; Spin-exchange optical pumping; SEOP; Glass cells | 2002 |
| 19 |  | Photodissociation measurements of bond dissociation energies: Ti?+, V?+, Co?+, and Co?+ | Morse, Michael David | The bond dissociation energies of Ti2+, V+2 , Co+2, and Co: have been measured from the sudden onset of predissociation in the photodissociation spectra of these molecules, yielding values of D?(Ti+2)=2.435+0.002 eV, D?(V+2)=3.140?0.002 eV, D?(Co+2)=2.7651?0.001 eV, and D?(Co+3)=2.086?0.002 eV. Thes... | 1993 | |
| 20 |  | Resonant two-photon ionization spectroscopy of jet-cooled Pt? | Morse, Michael David | The gas phase optical spectrum of jet-cooled Pt? has been investigated over the range of 11 300 to 26 300 cm -1 using resonant two-photon ionization spectroscopy in combination with time-of-flight mass spectrometry. Numerous vibronic bands are observed. Analysis of the data gives the location of som... | 1988 | |
| 21 |  | Interaction of an aluminum atom with a closed subshell metal atom: spectroscopic analysis of AIZn | Morse, Michael David | Resonant two-photon ionization spectroscopy has been employed to investigate diatomic AlZn produced by laser vaporization of a 1:2 Al:Zn alloy target disk in a supersonic expansion of helium. Several discrete transitions are reported in the energy range from 18 400 to 19 100 cm-?. Most of these are... | 1994 | |
| 22 |  | Spectroscopic studies of jet-cooled AINi | Morse, Michael David | 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 | |
| 23 |  | Guided ion beam and theoretical studies of the reaction of Ag+ with CS2: gas-phase thermochemistry of AgS+ and AgCS+ and insight into spin-forbidden reactions | Armentrout, Peter B. | The gas-phase reactivity of the atomic transition metal cation, Ag+, with CS2 is investigated using guided-ion beam mass spectrometry. Endothermic reactions forming AgS+ and AgCS+ are observed but are quite inefficient. This observation is largely attributed to the stability of the closed shell Ag+(... | 2010 | |
| 24 |  | Guided ion beam studies of the reaction of Nin+ (n=2-16) with D2: nickel cluster-deuteride bond energies | Armentrout, Peter B. | The kinetic-energy dependences of the reactions of Nin+ (n=2-16) with D2 are studied in a guided ion beam tandem mass spectrometer. The products observed are NinD+ for all clusters and NinD2 + for n=5-16. Reactions for formation of NinD+ are observed to exhibit thresholds, whereas cross sections for... | Metal clusters; Nickel ions; Bond energies; Deuterides; Collision-induced dissociation; Endothermic reactions | 2002 |
| 25 |  | Guided ion beam studies of the reactions of Crn + (n=2-18) with O2: chromium cluster oxide and dioxide bond energies | Armentrout, Peter B. | The kinetic energy dependence of the reactions of Crn+ (n=2-18) with O2 are studied in a guided ion beam mass spectrometer. A variety of CrmO2+, CrmO+, and Crm+ product ions, where m≤n, are observed, with the dioxide cluster ions dominating the products for all larger reactant cluster ions. React... | Metal clusters; Chromium ions; Oxygen; Oxygen; Bond energies; Exothermic reactions | 1998 |