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  • 1
    Electronic Resource
    Electronic Resource
    Optical spectroscopy analysis of YBa2Cu3O7 at room temperature and at 10 K (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 2382-2387 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Optical spectra of sputtered excited particles emitted during fast Kr+ ion bombardment of YBa2Cu3O7 above and below the critical temperature Tc∼90 K were recorded between 190.0 and 679.3 nm. Intensities and positions of lines are discussed and interpreted. The two optical spectra exhibit discrete lines which are attributed to neutral excited Cu, Ba, and Y and a few lines attributed to ionic Ba and Y. The relative intensities are the same at 10 K and at room temperature, while the absolute intensity increases by 40%. A small continuum attributed to oxide is also observed in the two spectra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348724
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  • 2
    Electronic Resource
    Electronic Resource
    Physical study of laser-produced plasma in confined geometry (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 775-784 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We study in this paper the different physical processes involved in laser-produced plasma in confined geometry. With this technique, a laser irradiates a target at an intensity of a few GW/cm2, and the produced plasma is confined by a transparent overlay to the laser which covers this target. This configuration has appeared necessary for example for metallurgical applications where, for a given laser energy, enhanced pressures must be realized in order to achieve high shock pressures. Therefore, a physical study of this method is useful in order to optimize this technique. We have first developed an analytical model which describes the different steps involved in this process, points out the interest of this technique, and compares it to the direct ablation regime. In the first stage, during the laser heating, the generated pressure is typically 4–10 times greater than the corresponding one obtained in direct ablation. The second step begins after the switch-off of the laser and is characterized by an adiabatic cooling of the plasma which maintains the applied pressure over a period which is about 2 times the laser-pulse duration. Finally, the third stage concerns also the adiabatic cooling of the recombined plasma, but during this period the exerted pressure is too small to realize a plastic deformation of the material.We show that the impulse momentum given to the target is mainly generated during this step. This model allows us to also determine the velocities of thin foils accelerated with confined plasmas, and we show that very high hydrodynamic efficiencies can be achieved by this technique. Experimentally, we measured with quartz gauges, the pressures obtained in confined geometry, for 30-, 3-, and 0.6-ns laser-pulse duration. This study shows that short pulse durations are sensitive to the initial roughness of the interface, and such an effect should be suppressed by using a liquid confinement. Then, we conclude that a large fraction of the absorbed laser energy (80%–90%) is used for the ionization of the medium in these conditions of irradiation. Finally, we experimentally point out that the laser-induced breakdown of the confining medium is the main mechanism which limits the generated pressure and show the influence of the laser-pulse duration on this effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346783
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  • 3
    Electronic Resource
    Electronic Resource
    An experimental and theoretical study of the doubly charged ion O2+2 (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 3594-3602 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The energy levels of triplet states of doubly charge oxygen, obtained using double charge transfer spectroscopy, have been examined in the light of ab initio calculations. Four peaks were found in the double charge transfer spectrum with energies of 41.1±0.2, 43.2±0.2, 48.2±0.3, and 51.3±0.3 eV, respectively. The first and third peaks have been assigned to the 3Σ+u and the 3Πu excited states, respectively. The second peak has been assigned to the population of the 3Πg states. The configuration of the state at 51.3 eV is unknown. The effect of the symmetry rule Σ+↔(Slashthrough accent mark)Σ− is discussed and the validity of the spin conservation rule is demonstrated when a proton is used as a projectile in this experimental technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462865
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  • 4
    Electronic Resource
    Electronic Resource
    Vibronic and electronic states of doubly charged H2S studied by Auger and charge transfer spectroscopy and by ab initio calculations (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 918-931 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Doubly ionic states of H2S are investigated by means of Auger and double charge transfer spectroscopy. From the kinetic energy distribution of H− ions arising from double charge-transfer of protons impinging on gaseous H2S several singlet state energies of H2S2+ have been resolved in the 30 to 50 eV energy region. The most intense experimental peak is narrow proving that the doubly ionized ground state is stable or quasi-stable. The LII,IIIVV Auger electron spectrum exhibits a number of well-defined structures which exhibit vibrational fine structure in the outermost bands. The assignments of the charge transfer states and of the Auger bands are given by ab initio MCSCF electronic structure calculations. We also present vertical double ionization energies, optimized geometries and normal coordinate analysis for the neutral, single and double ionized states. A vibrational analysis of the resolved Auger bands is carried out by employing a recently derived theory for vibrational decay of short-lived core hole states in polyatomic molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459118
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  • 5
    Electronic Resource
    Electronic Resource
    Experimental and theoretical studies of the doubly charged NO2+2 ion (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 3553-3564 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Six features observed in the energy distribution of H− ions arising from the single collision double charge transfer of 3–5 keV protons on nitrogen dioxide are interpreted as vertical double ionization energies of NO2 of 35.1, 38.1, 39.5, 41.0, 43.2, and 46.8 eV to form doublet states. Theoretical energies of the first 13 doublet and quartet electronic states of NO2+2 have been calculated by the ab initio CIPSI method at a fixed N–O distance and for several O–N–O bending angles. Thresholds and kinetic energy releases observed in dissociative double photoionization of NO2 are interpreted by comparison with the calculations and charge transfer results. The N- and O-Auger spectra of NO2 have been recorded and some of the 40 features observed have been assigned, confirming and improving the spectrum of NO2+2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454925
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  • 6
    Electronic Resource
    Electronic Resource
    The Gaseous Electronic Conference (GEC) reference cell as a benchmark for understanding microelectronics processing plasmas : The 40th annual meeting of the division of plasma physics of the american physical society (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 2307-2313 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A collaborative experimental effort was initiated at a workshop at the 1988 Gaseous Electronics Conference (GEC) to start a program to understand the fundamental physics of processing plasmas, as well as give researchers a baseline experiment to develop plasma diagnostics to be used on manufacturing plasma systems. The design was based on the use of 4 in. diameter, aluminum electrodes in a parallel plate configuration at 13.56 MHz, run in a capacitively coupled discharge mode. Before conclusions about commercial plasma systems can be made from experimental results from the GEC cell, the GEC cell must be shown to behave similarly to that of a commercial system. The etching performance of a GEC cell was compared to a SEMI Group 1000 TP/CC reactive ion etcher (RIE). The GEC cell and the RIE gave similar etch rates and fluorine concentrations when the electrode plate spacing and power density were the same. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873482
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  • 7
    Electronic Resource
    Electronic Resource
    Electronic states and decay mechanisms of the N2O2+ dication (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 1511-1515 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Energies of the electronic states of the triatomic dication N2O2+ in the Franck–Condon zone of neutral N2O have been determined by a combination of (1) double charge transfer spectroscopy to locate singlet states, (2) photoionization measurements to locate the lowest triplet state, and (3) configuration-interaction calculations to identify the states and to predict the energies of other triplets. It seems likely that two distinct charge separation reactions compete in the relatively slow decay of the N2O2+ ground state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454129
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  • 8
    Electronic Resource
    Electronic Resource
    Formation and dissociation of doubly ionized methane (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 241-246 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Translational energy spectra of H− ions arising from double charge transfer to 1.5–7.0 keV protons from methane have been recorded and interpreted as the single and double ionization spectra of CH4. The excited states of CH++4 are not resolved, but a large broad peak of 4 eV half-width is observed, starting at around 35 eV, with a long tail extending to 44 eV. The peak maximum is at 38.6 eV. Four dissociation reactions of CH2+4 have been observed using photoion–photoion coincidence techniques with Heii light. All the principal discrepancies in comparisons between the experimental and theoretical work on CH2+4 can now be reconciled.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.449815
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  • 9
    Electronic Resource
    Electronic Resource
    Gene expression profiling and protection of Medicago truncatula against a fungal infection in response to an elicitor from green algae Ulva spp (2004)
    Oxford, UK : Blackwell Science Ltd
    Plant, cell & environment 27 (2004), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Elicitors are molecules known to trigger plant defence responses against pathogens. In a search for new sources of eliciting compounds from marine algae, an extract was prepared from green algae, Ulva spp., and its elicitor activity was established on the model legume, Medicago truncatula. When infiltrated into plant tissues or sprayed onto the leaves, this extract induced the expression of the defence-related marker gene PR10 without provoking necrosis. Spraying a solution at 500 µg mL−1 was sufficient to obtain maximum induction of PR10 after 2 d. Using a cDNA array enriched in genes potentially involved in plant defence, the expression of 152 genes was monitored after one or two consecutive treatments. A broad range of defence-related transcripts was found to be up-regulated, notably genes involved in the biosynthesis of phytoalexins, pathogenesis-related proteins and cell wall proteins. In contrast, the expression of primary metabolism-related genes did not change significantly. Consistent with its effect on defence gene expression, it was found that prior treatment of M. truncatula with the Ulva extract protected the plants against subsequent infection by the pathogenic fungus Colletotrichum trifolii.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.2004.01197.x
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  • 10
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    Advanced Virgo Status (2020)
    Institute of Physics
    Details
    Publication Date: 2020-01-01
    Print ISSN: 1742-6588
    Electronic ISSN: 1742-6596
    Topics: Physics
    Published by Institute of Physics
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