Open Access. Powered by Scholars. Published by Universities.®
Physical Sciences and Mathematics Commons™
Open Access. Powered by Scholars. Published by Universities.®
- Institution
-
- University of Nebraska - Lincoln (3584)
- Selected Works (2697)
- Missouri University of Science and Technology (2142)
- Utah State University (1868)
- Old Dominion University (1589)
-
- TÜBİTAK (1336)
- Syracuse University (889)
- California Polytechnic State University, San Luis Obispo (879)
- University of Kentucky (847)
- Air Force Institute of Technology (813)
- University of Central Florida (608)
- Portland State University (567)
- William & Mary (552)
- University of Tennessee, Knoxville (543)
- University of Nevada, Las Vegas (537)
- City University of New York (CUNY) (535)
- Technological University Dublin (526)
- University of Texas Rio Grande Valley (506)
- Wright State University (472)
- University of South Carolina (447)
- Brigham Young University (408)
- Michigan Technological University (400)
- University of New Mexico (385)
- Chapman University (351)
- SelectedWorks (327)
- Virginia Commonwealth University (327)
- Cleveland State University (307)
- Florida Institute of Technology (295)
- University of Arkansas, Fayetteville (262)
- University of Dayton (260)
- Keyword
-
- Physics (872)
- Department of Physics (244)
- Optics (184)
- Spectroscopy (177)
- Gravitational waves (162)
-
- Scattering (152)
- Graphene (147)
- Galaxies (133)
- Plasma (133)
- Thin films (133)
- Simulation (130)
- Nanoparticles (124)
- Electron (123)
- Polarization (123)
- Superconductivity (119)
- Radiation (109)
- Pure sciences (105)
- Condensed matter (102)
- Ionization (102)
- Quantum physics (99)
- Photoluminescence (98)
- CMS (96)
- Laser (95)
- Semiconductors (95)
- Cosmology (89)
- Energy (89)
- Ionosphere (88)
- Thermodynamics (87)
- Magnetism (86)
- Temperature (86)
- Publication Year
- Publication
-
- Physics Faculty Publications (1883)
- Physics Faculty Research & Creative Works (1742)
- Turkish Journal of Physics (1336)
- Faculty Publications (1154)
- Theses and Dissertations (1078)
-
- Physics (897)
- Physics and Astronomy Faculty Publications (772)
- Electronic Theses and Dissertations (679)
- All Physics Faculty Publications (652)
- Physics - All Scholarship (553)
- Physics Faculty Publications and Presentations (497)
- Doctoral Dissertations (495)
- Physics and Astronomy Faculty Publications and Presentations (451)
- Articles (392)
- Physics Publications (378)
- Department of Physics and Astronomy: Faculty Publications (371)
- Kenneth Bloom Publications (368)
- Masters Theses (365)
- Dissertations, Theses, and Masters Projects (361)
- Publications and Research (313)
- Mathematics, Physics, and Computer Science Faculty Articles and Research (311)
- Peter Dowben Publications (284)
- David Sellmyer Publications (278)
- Aerospace, Physics, and Space Science Faculty Publications (275)
- International Building Physics Conference 2018 (255)
- Physics & Astronomy ETDs (245)
- Dissertations (242)
- Anthony F. Starace Publications (229)
- Electrical and Computer Engineering Faculty Publications (192)
- Robert Katz Publications (191)
- Publication Type
Articles 35491 - 35520 of 36527
Full-Text Articles in Physical Sciences and Mathematics
Negative Muon Depolarization In Liquid Helium And Several Hydrocarbons, David C. Buckle
Negative Muon Depolarization In Liquid Helium And Several Hydrocarbons, David C. Buckle
Dissertations, Theses, and Masters Projects
No abstract provided.
Measurement Of Positive And Negative Pion Total Cross-Sections On Helium-3, Beryllium-9, And Carbon-12 Over The 3/2, 3/2 Resonance Region, Charles Bailey Spence Jr.
Measurement Of Positive And Negative Pion Total Cross-Sections On Helium-3, Beryllium-9, And Carbon-12 Over The 3/2, 3/2 Resonance Region, Charles Bailey Spence Jr.
Dissertations, Theses, and Masters Projects
No abstract provided.
Nmr Detection Of Ionized Arsenic Vacancy Production In Gallium Arsenide, Richard K. Hester
Nmr Detection Of Ionized Arsenic Vacancy Production In Gallium Arsenide, Richard K. Hester
Dissertations, Theses, and Masters Projects
No abstract provided.
…Y La Junta De Energía Nuclear, Habló, Aldemaro Romero Jr.
…Y La Junta De Energía Nuclear, Habló, Aldemaro Romero Jr.
Publications and Research
No abstract provided.
Comments On 'Fluctuations In Guiding Center Plasma In Two Dimensions', George Vahala, Linda L. Vahala, David Montgomery, Glenn Joyce
Comments On 'Fluctuations In Guiding Center Plasma In Two Dimensions', George Vahala, Linda L. Vahala, David Montgomery, Glenn Joyce
Electrical & Computer Engineering Faculty Publications
It is stated that the principal result of the paper by Taylor and Thompson (see abstr. A14511 of 1973) on autocorrelations in density for the electrostatic guiding center plasma in two dimensions is wrong owing to an incorrect integration. It is further stated that there is no meaningful distinction between an `interaction cutoff' and a `fluctuation cutoff'.
Erratum: Radiative And Predissociative Lifetimes Of The A ²Σ+ State Of Oh, Richard A. Anderson, R. A. Sutherland
Erratum: Radiative And Predissociative Lifetimes Of The A ²Σ+ State Of Oh, Richard A. Anderson, R. A. Sutherland
Physics Faculty Research & Creative Works
No abstract provided.
Properties Of Microwave Cavities Containing Magnetic Resonant Samples, Kathy A. Rages, Robert E. Sawyer, Edward Boyd Hale
Properties Of Microwave Cavities Containing Magnetic Resonant Samples, Kathy A. Rages, Robert E. Sawyer, Edward Boyd Hale
Physics Faculty Research & Creative Works
Properties of TE011 cylindrical, microwave cavities containing cylindrical samples of various radii and dielectric constants are calculated. The properties considered are the resonant frequency, quality factor (Q), relevant magnetic filling factor for spin transitions (ε), and a signal sensitivity factor (Qε) for a lossless sample. Sample sizes range from zero radius to full cavity radius with some experimental data on less than full length samples. The choice of dielectric constants ranges from one to sixteen. The data are presented in dimensionless form since they will be of use to other ESR experimentalists. It is shown that use of large samples …
A Photographic Study Of The Infrared Oh Airglow, G. C. Loos
A Photographic Study Of The Infrared Oh Airglow, G. C. Loos
Physics & Astronomy ETDs
OH airglow is due to the rotational-vibrational transitions of the hydroxyl radical. Previous efforts to find the airglow's emission height in the atmosphere are discussed. Photography of the infrared airglow with a fast 35mm camera and Eastman Kodak high speed infrared film is described and a method for triangulating emission heights by two station photography is explained. The techniques for reduction of film data to height measurements and velocity measurements are presented. Observations are reported concerning the frequency of occurrence of bright spots and other features on the OH background and the intensity of the airglow as a function of …
Electron Spin Resonance In Argon-Ion-Implanted Silicon, Keh Chang Chu, Weiler R. Hurren, Edward Boyd Hale, John Reigle
Electron Spin Resonance In Argon-Ion-Implanted Silicon, Keh Chang Chu, Weiler R. Hurren, Edward Boyd Hale, John Reigle
Physics Faculty Research & Creative Works
A new paramagnetic center with g = 2.0029 is observed, in both n- and p-type silicon after they are heavily implanted (higher than 1017 ions/cm2) with 150-keV argon ions. © 1973 American Institute of Physics.
Spectroscopic Determinations Using Resonance Spin-Flip In 12C (P,P1) 12C And 50Ti (P,P1) 50Ti, Lee Robert Baumann
Spectroscopic Determinations Using Resonance Spin-Flip In 12C (P,P1) 12C And 50Ti (P,P1) 50Ti, Lee Robert Baumann
Masters Theses
No abstract provided.
A Direct Measurement Of The Ratio Of The Reaction Cross Sections For Two-Photon And Three-Photon Positron Annihilation In Aluminum And Silver, Robert Maurice Heavenrich
A Direct Measurement Of The Ratio Of The Reaction Cross Sections For Two-Photon And Three-Photon Positron Annihilation In Aluminum And Silver, Robert Maurice Heavenrich
Masters Theses
The probability of annihilation of a positron with its antiparticle, an electron, is spin dependent. Since both particles have spin component one -half, there are two possible relative orientations of their spins they can either be aligned (parallel) in the 3S, triplet, state with total spin component │Sz│= ½ n - ½ n = 1 n or they can be opposite (antiparallel) in the 1S; singlet, state with│Sz│= ½ n - ½ n = 0. To conserve energy and angular momentum, annihilation from the triplet state must result in the creation of an odd …
Field Radiation Of Spin I Massless Particle, Ralph Alvin Mudgett
Field Radiation Of Spin I Massless Particle, Ralph Alvin Mudgett
Masters Theses
No abstract provided.
Self‐Focusing Of Laser Light In The Isotropic Phase Of A Nematic Liquid Crystal, D.V.G.L.N. Rao, S. Jayaraman
Self‐Focusing Of Laser Light In The Isotropic Phase Of A Nematic Liquid Crystal, D.V.G.L.N. Rao, S. Jayaraman
Physics Faculty Publications
Self‐focusing of ruby laser light is studied as a function of sample length and temperature in the isotropic phase of nematic liquid‐crystal MBBA. The critical power for self‐focusing, 0.36 kW, observed near the phase transition temperature is a factor of 20 times less than that for CS2. The corresponding nonlinear index 4.4 × 10−10 esu is the largest value known so far for any material.
Dissociative Attachment From The O2 (A1 Δ G) State, P.D. Burrow
Dissociative Attachment From The O2 (A1 Δ G) State, P.D. Burrow
Paul Burrow Publications
The dissociative attachment cross section for production of O- by electron impact on the metastable O2 (a1 Δ g) state is studied. The cross section is found to be 4.6 ± 1.3 × 10-18 cm2 at its maximum. From the measured energy dependence, we infer that the dissociative attachment process takes place through the O2̅ (2 Пu) state as in the case of O- production from the O2 ground state. The information thus obtained is used to estimate the portion of the cross section for excitation of the …
X-Ray Scattering From Gaseous 3he And 4he At Small Momentum Transfer, Robert Hallock
X-Ray Scattering From Gaseous 3he And 4he At Small Momentum Transfer, Robert Hallock
Robert Hallock
Several experiments are described in which the structure factor S(k) was determined for gaseous 3He and 4He at temperatures near 5 K. In the momentum-transfer range 0.15
Hyperfine Interactions In The Intramolecular Antiferromagnet (Fe Salen C1)2, R. Lechan, C. Nicolini, C. R. Abeledo, Richard B. Frankel
Hyperfine Interactions In The Intramolecular Antiferromagnet (Fe Salen C1)2, R. Lechan, C. Nicolini, C. R. Abeledo, Richard B. Frankel
Physics
Magnetic hyperfine interactions in (Fe salen C1)2 have been studied using the Mössbauer effect in external magnetic fields up to 80 kOe and for 4.2 ≤ T ≤ 80 °K. The low‐temperature results are adequately described by a simple intramolecular exchange model with J = 7.0 cm−1 and a hyperfine interaction constant of −180 kOe per unit spin. At higher temperature the effective field approximation breaks down. Data for (Fe salen)2O are also briefly reported.
Orbital Ground State Inversion In [Fe(H2O)6](Clo4)2, W. M. Reiff, Richard B. Frankel, C. R. Abeledo
Orbital Ground State Inversion In [Fe(H2O)6](Clo4)2, W. M. Reiff, Richard B. Frankel, C. R. Abeledo
Physics
Mössbauer spectroscopy in external magnetic fields has been used to measure the signs of the principal components of the electric field gradient Vzz in the two forms of [Fe(H2O)6)(Cl04)2. The signs are Vzznegative for low temperature form (A) with quadrupole splitting ΔEA = 3.4 mm/sec, and Vzz positive for high temperature form (B) with ΔEB = 1.4 mm/sec. This implies a trigonally distorted ligand field and the transition (A) → (B) corresponds to compression → elongation with respect to the trigonal axis.
Raman Spectrum Of Gadolinium Molybdate Above And Below The Ferroelectric Transition, Frank Ullman, B. J. Holden, B. N. Ganguly, John R. Hardy
Raman Spectrum Of Gadolinium Molybdate Above And Below The Ferroelectric Transition, Frank Ullman, B. J. Holden, B. N. Ganguly, John R. Hardy
John R. Hardy Papers
90 °-scattered Raman spectra of single-domain gadolinium molybdate have been obtained at room temperature and above the 159 °C ferroelectric transition on several crystal orientations. Lines in the 0-200-cm-1 range can all be associated with Raman-active phonons and are identified by symmetry considerations, scattering-efficiency calculations, and comparison of spectra for different crystal orientations. Lines in the 200-1000-cm-1 range can be identified with coupled vibrations of tetrahedral molybdate ions. Spectra for frequencies above 1000 cm-1 originate from impurity flourescence. The effect of the presence of multiple domains on the spectra was determined; the observed differences between single-domain and …
On The Reactions Of N2 With O, John B. Delos
On The Reactions Of N2 With O, John B. Delos
Arts & Sciences Articles
Unimolecular decomposition of N2O, quenching of O(1D) by N2, and vibrational relaxation of N2 in the presence of O(3P) are all believed to occur by the same curve crossing mechanism. This mechanism is examined making use of a complete theory of curve crossings that we have developed earlier. Good agreement with experiment is found for the unimolecular decomposition rate. The simple curve crossing mechanism does not explain the observed O(1D) quenching rate; this rate must be due to complex formation and/or additional crossings. At high temperatures, the calculated vibrational relaxation time …
Orbital Ground State Reversal In The High‐Spin Complex Fe(Ii) (N, N′‐Dicyclohexylthiourea)6(Clo4)2, R. Latorre, C. R. Abeledo, Richard B. Frankel, J. A. Costamagna, W. M. Reiff, E. Frank
Orbital Ground State Reversal In The High‐Spin Complex Fe(Ii) (N, N′‐Dicyclohexylthiourea)6(Clo4)2, R. Latorre, C. R. Abeledo, Richard B. Frankel, J. A. Costamagna, W. M. Reiff, E. Frank
Physics
Mössbauer spectroscopy of iron (II)(N, N′‐Dicyclohexylthiourea)6 (ClO4)2 shows the existence of two isomers. At low temperatures (T < 200°K) a form A with quadrupole splitting ΔE = 3.31 mm∕sec is stable. At and above room temperature a form B with ΔE = 1.32 mm∕sec is stable. For 200 °K < T < 300°K both forms are observed with the B∕A ratio increasing with increasing temperature. The values of ΔE are typical of Fe2+ with an orbital singlet and an orbital doublet ground state for A and B, respectively. The isomer shift and magnetic susceptibility results indicate that both …
Lattice Dynamics Of A Rigid-Ion Model For Gadolinium Molybdate, L. L. Boyer, John R. Hardy
Lattice Dynamics Of A Rigid-Ion Model For Gadolinium Molybdate, L. L. Boyer, John R. Hardy
John R. Hardy Papers
Results of lattice-dynamical calculations are presented which support the view that the ferroelectric phase transition in gadolinium molybdate (GMO) arises from the softening and ultimate instability of a doubly degenerate zone-edge mode of the high-temperature paraelectric phase. We have used a rigid-ion model in which the short-range force constants are obtained from a detailed knowledge of the crystal structure together with the conditions imposed by the requirement that the crystal must be in static equilibrium under the combined influence of both Coulomb and short-range forces. Our results show that this type of approach is very useful when one is dealing …
Magnetic Interactions And High-Field Magnetization In Dilute Magnetic Alloys , J.M. Franz, David J. Sellmyer
Magnetic Interactions And High-Field Magnetization In Dilute Magnetic Alloys , J.M. Franz, David J. Sellmyer
David Sellmyer Publications
Magnetic interactions have been investigated in Cu(Mn) and Cu(Fe) alloys with concentrations ranging from several hundred to several thousand ppm. In each system two sets of alloys were prepared in different ways to test for sensitivity to structrual modifications. In the Cu(Mn) alloys there was very little difference in magnetic properties of the two sets of alloys which is consistent with the expectation that the Cu(Mn) alloys form good random solid solutions. The magnetic properties were compared with the recent mean-random-field theory of Klein in the low-temperature limit. It was found that the theory is able to explain the concentration …
High Magnetic Field Behavior Of Iron Impurities In Chromium, Richard B. Frankel, N. A. Blum
High Magnetic Field Behavior Of Iron Impurities In Chromium, Richard B. Frankel, N. A. Blum
Physics
Mössbauer measurements in 57Fe in dilute FeCr alloys in external magnetic fields up to 140 kOe are presented. The magnetic hyperfine interactions are compared with results obtained by Herbert, Clark and Wilson and are discussed in terms of a model due to Housley and Dash.
15th Annual Rocky Mountain Spectroscopy Conference
15th Annual Rocky Mountain Spectroscopy Conference
Rocky Mountain Conference on Magnetic Resonance
Program and abstracts from the 15th annual meeting of the Rocky Mountain Spectroscopy Conference, sponsored by the Rocky Mountain Section of the Society for Applied Spectroscopy. Held in Denver, Colorado, August 20-21, 1973.
Synthetic Analogs Of The Active Sites Of Iron-Sulfur Proteins. Structure And Properties Of Bis[O-Xylyldithiolato-Μ2-Sulfidoferrate(Iii)], An Analog Of The 2fe-2s Proteins, J. J. Mayerle, Richard B. Frankel, R. H. Holm, James A. Ibers, W. D. Phillips, J. F. Weiher
Synthetic Analogs Of The Active Sites Of Iron-Sulfur Proteins. Structure And Properties Of Bis[O-Xylyldithiolato-Μ2-Sulfidoferrate(Iii)], An Analog Of The 2fe-2s Proteins, J. J. Mayerle, Richard B. Frankel, R. H. Holm, James A. Ibers, W. D. Phillips, J. F. Weiher
Physics
The synthetic analog approach has been applied to a clarification of the active sites of 2Fe-2S* proteins. The compound (Et4N)2[FeS(SCH2)2C6H4]2, derived from o-xylyl-α,α′-dithiol, has been prepared and its structure has been determined by x-ray diffraction. The centrosymmetric anion contains two tetrahedrally coordinated ferric ions bridged by two sulfide ions and separated by 2.70 Å. Comparison of electronic, Mössbauer, and proton magnetic resonance spectra and magnetic susceptibility of the anion with the corresponding properties of the oxidized forms of the proteins reveals …
Hot Electron Injection Into Dense Argon, Nitrogen, And Hydrogen, Pavel Smejtek, M. Silver, K. S. Dy, David G. Onn
Hot Electron Injection Into Dense Argon, Nitrogen, And Hydrogen, Pavel Smejtek, M. Silver, K. S. Dy, David G. Onn
Physics Faculty Publications and Presentations
Hot electrons have been injected into very dense argon, nitrogen, and hydrogen gases and liquids. The current‐voltage characteristics are experimentally determined for densities (N) of argon, nitrogen, and hydrogen ranging from about 10²⁰ to 10²² cm⁻³ and applied fields (E) ranging from about 10 to 10⁴ V cm⁻¹. The argon data show a square root E∕N dependence of the current. The nitrogen and hydrogen data show a complicated dependence of the current on E∕N due to the rapid thermalization in the region of the image potential of the injected electrons through inelastic collision processes not present in argon. A hydrodynamic‐two‐fluid …
Determination Of (N, 2n) Reaction Isomeric Cross Section For 87rb, 112cd, 138bz, And 186w Using 14 Mev Neutrons, Hsiao-Chueh Kao
Determination Of (N, 2n) Reaction Isomeric Cross Section For 87rb, 112cd, 138bz, And 186w Using 14 Mev Neutrons, Hsiao-Chueh Kao
Masters Theses & Specialist Projects
The purpose of this investigation was to measure the cross section for each of the reactions 87Rb(n, 2n) 86mRb, 112Cd(n, 2n)111mCd, 138Ba(n, 2n) 137mBa and 186W(n, 2n) 185mW at 14.7 ± 0.03 MeV incident neutron energy. The incident neutron flux was determined during each irradiation from the activity produced in copper or aluminum disks between which the isotopically enriched sample was sandwiched. The 63Cu(n, 2n)62Cu and 27Al(n, p)27Mg reaction cross sections were assumed to be 593 ± 45 mb and 73 ± 5 …
Comment On "Length And Velocity Formulas In Approximate Oscillator-Strength Calculations", Anthony F. Starace
Comment On "Length And Velocity Formulas In Approximate Oscillator-Strength Calculations", Anthony F. Starace
Anthony F. Starace Publications
A previous paper by Starace showed that the length formula for the electric-dipole matrix element is the only consistent one for calculations that solve for the exact eigenfunctions of an approximate Hamiltonian containing a nonlocal potential. It is emphasized here that disagreement between such a length-formula calculation and experiment indicates inadequacy of the approximate Hamiltonian and not that the velocity formula may be preferable.
Angular Distributions Of Protons From The 28Si(∝,P)31P Reaction, Susan Mary Allen
Angular Distributions Of Protons From The 28Si(∝,P)31P Reaction, Susan Mary Allen
Masters Theses
No abstract provided.
Properties Of 1‾ Excited States Of Complex Nuclei, Carlos Ignacio Calle
Properties Of 1‾ Excited States Of Complex Nuclei, Carlos Ignacio Calle
Masters Theses
No abstract provided.