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  • 1
    Online Resource
    Online Resource
    Exploring the crossover between high-energy-density plasma and ultracold neutral plasma physics
    AIP Publishing ; 2019
    In:  Physics of Plasmas Vol. 26, No. 10 ( 2019-10-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 26, No. 10 ( 2019-10-01)
    Abstract: In this paper, we present ideas that were part of the miniconference on the crossover between High Energy Density Plasmas (HEDP) and Ultracold Neutral Plasmas (UNPs) at the 60th Annual Meeting of the American Physical Society Division of Plasma Physics, November 2018. We give an overview of UNP experiments with an emphasis on measurements of the time-evolving ion density and velocity distributions, the electron-ion thermalization rate, and plasma self-assembly—all just inside the strongly coupled plasma regime. We also present theoretical and computational models that were developed to understand a subset of HEDP experiments. However, because HEDP experiments display similar degrees of strong coupling, many aspects of these models can be vetted using precision studies of UNPs. This comparison is important because some statistical assumptions used for ideal plasmas are of questionable validity in the strongly coupled plasma regime. We summarize two theoretical approaches that extend kinetic theories into the strong-coupling regime and show good agreement for momentum transfer and self-diffusion. As capabilities improve, both computationally and experimentally, UNP measurements may help guide the ongoing development of HEDP-appropriate plasma models. Future opportunities in viscosity, energy relaxation, and magnetized plasmas are discussed.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/1.5119144
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 1472746-8
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  • 2
    Online Resource
    Online Resource
    Electronic Structure and Geometry of Hydrogen Cyanide
    AIP Publishing ; 1967
    In:  The Journal of Chemical Physics Vol. 46, No. 5 ( 1967-03-01), p. 1797-1803
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 46, No. 5 ( 1967-03-01), p. 1797-1803
    Abstract: The geometry and charge distribution of HCN in its ground state has been determined by means of many-electron, self-consistent-field molecular-orbital wavefunctions. LCAO MO SCF calculations and ones which split the AO's with linear variation coefficients yield properties and total energies reasonably close to the molecular Hartree—Fock limit. A linear molecule with bond distances correct to 1% of the microwave spectroscopy values is obtained. Walsh's orbital-energy diagrams are found to be almost independent of angle but with nearly compensating variations and for this molecule Walsh's orbital-energy summation criterion leads to a bent ground state. This result, however, is easily understood in terms of the relatively high ionic character of the H–CN bond. An empirical molecular bind energy correlation scheme based on diatomic molecular Hartree—Fock solutions is employed to analyze the difference between the computed (7.10 eV) and the experimental (13.53 eV) binding energy values.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.1840937
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1967
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 3
    Online Resource
    Online Resource
    Picosecond gain and saturation measurements in a KrF laser amplifier depumped by amplified spontaneous emission
    AIP Publishing ; 1991
    In:  Journal of Applied Physics Vol. 70, No. 10 ( 1991-11-15), p. 5238-5245
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 70, No. 10 ( 1991-11-15), p. 5238-5245
    Abstract: The input/output characteristic of a large aperture (270-mm diam) electron-beam-pumped KrF laser amplifier is obtained for pulses of 6- and 40-ps duration. The off-resonance absorption coefficient is estimated by measurement of loss at 268 nm. The gain-to-loss ratio is found to decrease from 8 to 6 as the specific pump rate is increased from 0.3 to 0.65 MW cm−3. Gain depumping due to amplified spontaneous emission (ASE) is treated by a simple 1D code and found to give good agreement with experiment. A 3D code incorporating wall reflections gives even better agreement. The spatial distribution of gain and ASE is recorded using visible and ultraviolet imaging.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.350233
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1991
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 4
    Online Resource
    Online Resource
    Internal Rotation Barriers for Hydrazine and Hydroxylamine from Ab Initio LCAO—MO—SCF Wavefunctions
    AIP Publishing ; 1967
    In:  The Journal of Chemical Physics Vol. 47, No. 3 ( 1967-08-01), p. 895-905
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 47, No. 3 ( 1967-08-01), p. 895-905
    Abstract: LCAO—MO—SCF ab initio wavefunctions with atomic basis orbitals of double-zeta accuracy have been constructed for N2H4 and NH2OH and the potential-energy curves versus internal-rotation angle have been determined. Similar wavefunctions for CH3CH3, CH3OH, CH3NH2, and H2O2, reported previously, showed a quantitatively useful correlation with experimental barrier heights and shapes. Since experimental information on the N2H4 and NH2OH barriers is incomplete or unknown, the theoretical results presented here may help guide experimental work. Decomposition of the total energy into one- and two-electron components has been found previously to help elucidate the physical origin of the rotational barrier, and results for the species studied here are given. The wavefunctions presented here (and those reported previously for the species noted above) are the most accurate available for molecules possessing a rotational barrier about a single bond, and comparison is made with the results of the other existing ab initio wavefunctions.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.1712054
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1967
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 5
    Online Resource
    Online Resource
    Development and modeling of a polar-direct-drive exploding pusher platform at the National Ignition Facility
    AIP Publishing ; 2018
    In:  Physics of Plasmas Vol. 25, No. 7 ( 2018-07-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 25, No. 7 ( 2018-07-01)
    Abstract: High-intensity laser facilities, such as the National Ignition Facility (NIF), enable the experimental investigation of plasmas under extreme, high-energy-density conditions. Motivated by validating models for collisional heat-transfer processes in high-energy-density plasmas, we have developed an exploding pusher platform for use at the NIF in the polar-direct-drive configuration. The baseline design employs a 3 mm-diameter capsule, an 18 μm-thick CH ablator, and Ar-doped D2 gas to achieve several keV electron-ion temperature separations with relatively low convergence ratios. In an initial series of shots at the NIF—N160920–003, -005, and N160921–001—the ratio of the laser intensity at different polar angles was varied to optimize the symmetry of the implosion. Here we summarize experimental results from the shot series and present pre- and post-shot analysis. Although the polar-direct-drive configuration is inherently asymmetric, we successfully tuned a post-shot 1D model to a set of key implosion performance metrics. The post-shot model has proven effective for extrapolating capsule performance to higher incident laser drive. Overall, the simplicity of the platform and the efficacy of the post-shot 1D model make the polar-direct-drive exploding pusher platform attractive for a variety of applications beyond the originally targeted study of collisional processes in high-energy-density plasmas.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/1.5025724
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 1472746-8
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  • 6
    Online Resource
    Online Resource
    Electron-Beam-Controlled Electrical Discharge as a Method of Pumping Large Volumes of CO2 Laser Media at High Pressure
    AIP Publishing ; 1972
    In:  Applied Physics Letters Vol. 20, No. 2 ( 1972-01-15), p. 56-60
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 20, No. 2 ( 1972-01-15), p. 56-60
    Abstract: An electron-beam-controlled discharge has been used to pump a variety of CO2 laser gas mixtures at atmospheric pressure in substantial volumes. Electrical and laser properties of the pumped medium have been measured. Small-signal-gain coefficients up to 0.045 cm−1 were achieved at field strengths of 3 kV/cm.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.1654044
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1972
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 7
    Online Resource
    Online Resource
    A Large Capacity, All-Glass Dispersion Oxygenator and Pump
    AIP Publishing ; 1952
    In:  Review of Scientific Instruments Vol. 23, No. 12 ( 1952-12-01), p. 748-753
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 23, No. 12 ( 1952-12-01), p. 748-753
    Abstract: A large capacity all-Pyrex dispersion oxygenator and pump is described which is capable of substituting temporarily for the function of the heart and lungs. Blood is oxygenated by tiny bubbles of oxygen dispersed in the blood. These bubbles are coalesced on a polymethylsiloaxane surface and eliminated in a bubble trap which also serves as the pumping chamber. Pumping is accomplished by an alternating suction and pressure controlled by two electrodes, suspended in the chamber, which actuate two solenoid valves. The apparatus causes no significant damage to the red blood cells. The apparatus is portable, easily cleaned and sterilized, and inexpensive. Oxygenation, carbon dioxide elimination, temperature, pulsation rate and pressure, flow, and mean pressure can be controlled for various physiological studies. The blood volume of the apparatus is constant except for the stroke volume and in this respect resembles the normal heart.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.1746149
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1952
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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  • 8
    Online Resource
    Online Resource
    Theory of the Hydrogen Bond: Ab Initio Calculations on Hydrogen Fluoride Dimer and the Mixed Water–Hydrogen Fluoride Dimer
    AIP Publishing ; 1970
    In:  The Journal of Chemical Physics Vol. 52, No. 10 ( 1970-05-15), p. 5085-5094
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 52, No. 10 ( 1970-05-15), p. 5085-5094
    Abstract: High-accuracy molecular orbital calculations have been carried out on different geometries of the hydrogen fluoride dimer and the mixed water–hydrogen fluoride dimer. A zigzag (near linear) structure is predicted for the hydrogen fluoride dimer with a dimerization energy in reasonable agreement with experiment. One geometry of the mixed water–hydrogen fluoride dimer has a very large stabilization energy (10 kcal/mole), and a microwave experiment is proposed to determine its exact structure. Changes in molecular properties and charge distribution upon dimer formation are calculated and a dimer rotational barrier determined.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.1672746
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1970
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 9
    Online Resource
    Online Resource
    Wave Functions and Correlation Energies for F, F—, and Ne
    AIP Publishing ; 1961
    In:  The Journal of Chemical Physics Vol. 34, No. 4 ( 1961-04-01), p. 1156-1160
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 34, No. 4 ( 1961-04-01), p. 1156-1160
    Abstract: Hartree-Fock solutions have been obtained by the finite expansion technique and a comparison is made with other computational methods and results. Total energies, correlation energies, and one-electron parameters are presented as well as a tabulation of the radial functions in analytic form. The correct sign and order of magnitude of the fluorine electron affinity is predicted.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.1731714
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1961
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 10
    Online Resource
    Online Resource
    Origin of Rotational Barriers. I. Many-Electron Molecular Orbital Wavefunctions for Ethane, Methyl Alcohol, and Hydrogen Peroxide
    AIP Publishing ; 1967
    In:  The Journal of Chemical Physics Vol. 46, No. 6 ( 1967-03-15), p. 2261-2275
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 46, No. 6 ( 1967-03-15), p. 2261-2275
    Abstract: An investigation into the origin of rotation barriers has been carried out with the aid of LC(Hartree—Fock) AO MO SCF calculations on CH3CH3, CH3OH, and H2O2. The general shape and magnitudes of the barriers are reasonably well represented by the wavefunctions and one may conclude that the origin of rotational barriers is to be found within the framework of the Hartree—Fock approximation. It is also found that study of several molecules, particularly ones of low symmetry, is required for a detailed understanding of barriers. The electronic energy has been decomposed into one- and two-electron parts. The relative phase and relative amplitude of these two components provide the best invariants available for analyzing the barrier mechanism. On the other hand the nuclear—nuclear repulsion is shown not to be an appropriate invariant. A physical picture of the barrier mechanism constructed from the electronic-energy decomposition depicts the barrier origin as a balance between the interactions of lone pairs, bonds, and the protons.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.1841031
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1967
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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