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  • 1990-1994  (17)
  • 1985-1989  (15)
  • 1
    Electronic Resource
    Electronic Resource
    Resonance effects in Josephson tunnel junctions with integrated tuning structures (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 1403-1409 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Large-current steps have been found in the I/V characteristics of superconducting tunnel elements that are integrated within fixed tuning structures. The Josephson frequency at the steps corresponds to the operation frequencies of the different tuning structures at 345, 460, or 600 GHz. Therefore, these current steps are interpreted as resonance effects generated by an internal interaction of the Josephson oscillation with the tuning structure. The result of a spectrometer measurement around 350 GHz is in very good agreement with the resonance frequency obtained from the I/V characteristic. This confirms the interpretation of the current steps. A simple dc measurement is therefore sufficient to determine the actual resonance frequency of the tuning structure. It may be shifted with respect to the expected frequency, due to deviations of the junction size or other parameters from their required values. The exact knowledge of the resonance frequency is important for the application of these integrated tunnel elements as mixers in radioastronomical receivers. In single junctions a splitting of the resonance step into several branches was observed, whereas in two-junction arrays a splitting into two distinct states was found. Irregular switching appeared between these two states. The temperature and magnetic-field dependence of the current steps was investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355298
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    NaSO→NaOS potential energy hypersurface (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 1799-1804 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: For the ground and first excited electronic states of NaOS three minima and three transition states for interconversion have been determined by means of self-consistent field (SCF) and single and double excitation configuration interation (CISD) analytic gradient methods. The relationships between these structures have been clarified by vibrational analyses of the transition states. One of the NaOS equilibrium geometries is linear and the other two are bent. The chemical bonds between the two component parts of NaOS, Na and SO, for both 2A' and 2A‘ bent structures have ionic character, although differing in degree. In all studies both double-zeta-plus polarization and triple-zeta-plus double polarization basis sets were used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459107
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Reflectivity of laser-produced plasmas generated by a high intensity ultrashort pulsef| (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 1635-1642 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Solid state density aluminum and carbon plasmas were generated by 350 fs KrF laser pulses at intensities of 1017 W cm−2. Reflectivity, x-ray emission, and spectra of the backscattered radiation were measured as a function of the laser polarization, angle of incidence, and intensity (I). For p-polarized light, the absorption (A) is almost intensity independent for 1015 W cm−2〈I〈2×1017 W cm−2, and can reach values up to A=0.8. For constant laser intensity, p-polarized light is up to a factor of 15 more efficient in generating x rays than s-polarized light. A polarization and angle of incidence-dependent absorption mechanism, such as resonance absorption or vacuum heating, is consequently important. The spectral line shape and positions of the reflected radiation from the carbon plasma showed a substantial intensity dependence. It is demonstrated that the backscattered spectrum is influenced by the plasma expansion (Doppler effect) and the temporal development of the electron density.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870665
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  • 4
    Electronic Resource
    Electronic Resource
    A single-shot spectrograph for the soft x-ray region (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 1631-1635 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A novel spectrograph comprised of a transmission grating, toroidal mirror, and microchannel plate detector is presented here. It is capable of detecting spectra in the wavelength range from 5 to 150 A(ring) with a resolution of about 1.5 A(ring). Owing it to high efficiency, even an x-ray spectrum of a low-energy laser produced plasma, i.e., emission of the order of 10−10 J/sr, can be measured in a single shot.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144851
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    A single-shot autocorrelator for the ultraviolet with a variable time window (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 998-1003 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A single-shot autocorrelator for the ultraviolet based on multiphoton ionization of gases has been developed. It makes use of a modified Mach–Zehnder interferometer and a segmented two-photon-ionization chamber as a spatial square-of-intensity detector. The device has in principle a continuously variable temporal detection range from ∼50 fs to 50 ps.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141207
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Soft x-ray spectra produced by subpicosecond laser-double-pulses (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 2672-2674 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Soft x-ray spectra generated on flat Al targets by a 500 fs KrF* laser pulse (intensity 5.3×1015 W/cm2), preceded by a prepulse of the same pulse duration, have been measured as a function of the pulse separation and the prepulse intensity. It was found that not only the total x-ray emission was much stronger when the prepulse was present but, in particular, lines in the shorter wavelength region had a higher intensity than without prepulse, and were strongly dependent on the time separation between the prepulse and the main pulse.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105902
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    High-precision refractive index measurements revealing order parameter fluctuations in KMnF3 and NiO (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 2606-2612 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The temperature dependence of the refractive index n of cubic crystals undergoing phase transitions (PT) is measured with an accuracy of the order δn=10−6 at temperatures between 3.5 and 1000 K with a computer-controlled Jamin–Lebedeff interferometer. Microscopic monitoring for in situ sample orientation and single domain work is provided. Results are presented for KMnF3 (antiferrodistortive PT) and NiO (antiferromagnetic PT) and discussed within the framework of a generalized phenomenological indicatrix perturbation theory. It predicts the proportionality between the order parameter autocorrelation function 〈δη2〉 and the refractive index anomaly preceding the PT. Comparison with recent theoretical predictions is performed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335451
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  • 8
    Electronic Resource
    Electronic Resource
    Absorption of subpicosecond ultraviolet laser pulses in high-density plasma (1990)
    Springer
    Applied physics 50 (1990), S. 79-99 
    Details
    ISSN: 1432-0649
    Keywords: 52.50.Jm ; 52.40.Db
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The absorption of 250 fs KrF laser pulses incident on solid targets of aluminum, copper and gold has been measured for normal incidence as a function of laser intensity in the range of 1012–1014 W cm−2 and as a function of polarization and angle of incidence for the intensity range of 1014−2.5×1015 W cm−2. As the intensity increases from 1012 W cm−2 the reflectivity at normal incidence changes from the low-intensity mirror reflectivity value to values in the range of 0.5–0.61 at 1014 W cm−2. For this intensity maximum absorption of 63–80% has been observed for p-polarized radiation at angles of incidence in the range of 54°–57°, increasing with atomic number. The results are compared with the expected Fresnel reflectivity from a sharp vacuum-plasma interface with the refractive index given by the Drude model and also to numerical calculations of reflectivity for various scale length density profiles. Qualitative agreement is found with the Fresnel/Drude model and quantitative agreement is noticed with the numerical calculations of absorption on a steep density profile with normalized collision frequencies, v/ω, in the range of 0.13–0.15 at critical density and normalized density gradient scale lengths, L/λ0, in the range of 0.018–0.053 for a laser intensity of 1014 W cm−2. At 2.5×1015 W cm−2 a small amount of preplasma is present and maximum absorption of 64–76% has been observed for p-polarized radiation at angles of incidence in the range of 45°–50°.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00331903
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  • 9
    Electronic Resource
    Electronic Resource
    Gain dynamics of XeF and subpicosecond pulse generation at 351 nm (1988)
    Springer
    Applied physics 47 (1988), S. 325-332 
    Details
    ISSN: 1432-0649
    Keywords: 42.60 ; 42.55 M
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Subpicosecond pulse amplification at the 351 nm line of XeF is reported. The study of the gain dynamics of XeF with subpicosecond (subnanosecond) pulses resulted in 0.2 mJ/cm2 (0.8 mJ/cm2) for the saturation energy density and 0.18 cm−1 (0.21 cm−1) for the small-signal-gain coefficient. In XeF a gain recovery of 78±4% with a 79±18 ps time constant is found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00716094
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  • 10
    Electronic Resource
    Electronic Resource
    KrF laser system with corrected pulse front and compressed pulse duration (1989)
    Springer
    Applied physics 49 (1989), S. 239-244 
    Details
    ISSN: 1432-0649
    Keywords: 42.60 ; 42.55M
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A high-power KrF laser system is presented providing 45 mJ, 150 fs pulses at the position of a target. Pulse front distortion is avoided by specially designed refractive optics. Pulse compression is done after final amplification using a simplified compressor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00714641
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