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  • METEOROLOGY AND CLIMATOLOGY  (2)
  • scattering  (2)
  • 61.80  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Applied physics 60 (1995), S. 507-512 
    ISSN: 1432-0649
    Schlagwort(e): 42.70 ; 81.40 ; 61.80
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We report on persistent spectral hole-burning and fluorescence-excitation spectroscopy in heavy-dose (3 × 1020 n/cm2) neutron-irradiated and annealed sapphire using a Ti:Sapphire ring laser in single-frequency and broad-band operation. The optimum conditions for hole burning were obtained after annealing the crystals to 400 °C. Holes have been detected in the near-infrared spectral range between 745 and 795 nm. At 1.5 K, the narrowest hole widths were approximately 2 GHz, so that about 104 holes can be burnt in this spectral region. Besides the storage density in the wavelength dimension, the coefficient describing the electric-field-induced filling of a spectral hole also rises by more than one order of magnitude as compared to crystals with low neutron-irradiation dose.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    ISSN: 1572-9540
    Schlagwort(e): scattering ; muons ; muonic hydrogen ; solid hydrogen
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Strong solid state effects in low energy scattering of pµ atoms in solid hydrogen are reported and analyzed. Such effects have been observed in TRIUMF experiment E742 where muons are stopped in thin frozen (3 K) layers of hydrogen. Emission of low energy pµ atoms from the hydrogen layer into adjacent vacuum was much higher than expected, based on calculations which ignored the solid nature of hydrogen. Monte Carlo simulations, performed using the scattering cross-sections with solid state effects taken into account, show the important role of the coherent elastic Bragg scattering in the diffusion of pµ atoms. For pµ energies lower than the Bragg cut-off limit (∼2 meV) the total scattering cross-section falls by several orders of magnitude, the hydrogen target becomes transparent and the emission of cold pµ atoms takes place.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    ISSN: 1572-9540
    Schlagwort(e): scattering ; muonic atom ; molecular formation rate ; time-of-flight ; Ramsauer–Townsend effect
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Our measurement compares the energy dependence of the scattering cross-sections of muonic deuterium and tritium on hydrogen molecules for collisions in the energy range 0.1–45 eV. A time-of-flight method was used to measure the scattering cross-section as a function of the muonic atom beam energy and shows clearly the Ramsauer–Townsend effect. The results are compared with theoretical calculations by using Monte Carlo simulations. The molecular pdµ and ptµ formation creates background processes. We measure the formation rates in solid hydrogen by detecting the 5.5 MeV (pdµ) and 19.8 MeV (ptµ) γ-rays emitted during the subsequent nuclear fusion processes.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Publikationsdatum: 2011-08-19
    Beschreibung: Five rocket-triggered cloud-to-ground lightning flashes were detected by the operational lightning-locating system at the NASA Kennedy Space Center on August 17, 1984. The locating system, which was designed to detect natural lightning, detected at least 2 and as many as 6 strokes in the triggered flashes, suggesting that some of the strokes in the triggered lightning had signal-amplitude and waveshape characteristics similar to natural lightning. However, not all triggered strokes were detected, indicating that some strokes were atypical in nature. Since the ground-strike points of the triggered flashes were known quite precisely, the accuracy of the lightning-locating system was also evaluated. The three direction finders were found to have a mean bearing accuracy of + or - 0.5-0.6 deg. The distance errors of the real-time position solutions of the locating system on the triggered flashes were in the range of 195-770 m, with a mean of 480 m.
    Schlagwort(e): METEOROLOGY AND CLIMATOLOGY
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Publikationsdatum: 2019-06-28
    Beschreibung: Data derived from a large network of electric field mills are used to determine the average diurnal variation of lightning in a Florida seacoast environment. The variation at the NASA Kennedy Space Center and the Cape Canaveral Air Force Station area is compared with standard weather observations of thunder, and the variation of all discharges in this area is compared with the statistics of cloud-to-ground flashes over most of the South Florida peninsula and offshore waters. The results show average diurnal variations that are consistent with statistics of thunder start times and the times of maximum thunder frequency, but that the actual lightning tends to stop one to two hours before the recorded thunder. The variation is also consistent with previous determinations of the times of maximum rainfall and maximum rainfall rate.
    Schlagwort(e): METEOROLOGY AND CLIMATOLOGY
    Materialart: Monthly Weather Review (ISSN 0027-0644); 112; 1134-114
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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