77,928 research outputs found
Gage measures total radiation, including vacuum UV, from ionized high-temperature gases
Transient-heat transfer gage measures the total radiation intensity from vacuum ultraviolet and ionized high temperature gases. The gage includes a sensitive piezoelectric crystal that is completely isolated from any ionized flow and vacuum ultraviolet irradiation
Vacuum ultraviolet radiation and solid state physics semiannual status reports no. 1, 2, and 3, period ending 28 feb. 1963
Spectroscopic instruments for vacuum ultraviolet radiation stud
Vacuum Cherenkov effect in logarithmic nonlinear quantum theory
We describe the radiation phenomena which can take place in the physical
vacuum such as Cherenkov-type shock waves. Their macroscopical characteristics
- cone angle, flash duration, radiation yield and spectral distribution - are
computed. It turns out that the radiation yield is proportional to the square
of the proper energy scale of the vacuum which serves also as the vacuum
instability threshold and the natural ultraviolet cutoff. While the analysis is
mainly based on the theory engaging the logarithmic nonlinear quantum wave
equation, some of the obtained results must be valid for any
Lorentz-invariance-violating theory describing the vacuum by (effectively)
continuous medium in the long-wavelength approximation.Comment: Updates: v2: changed title, added comments about vacuum instability
and Hawking radiation, added some refs previously missed due to certain
linguistic subtlety, v3 [pub]: removed comments about Hawking radiation
(requested by referees as it requires a separate study), changed title, added
more ref
Triple resonant four-wavemixing boosts the yield of continuous coherent VUV generation
Continuous-wave coherent radiation in the vacuum ultraviolet (VUV)wavelength
region at 121 nm will be essential for future laser-cooling of trapped
antihydrogen [1]. Cold antihydrogen will enable both tests of the fundamental
symmetry between matter and antimatter at unprecedented experimental precision
[2] and also experiments in antimatter gravity [3]. Another fascinating
application of narrowband continuous laser radiation in the VUV is quantum
information processing using single trapped ions in Rydberg-states [4, 5]. Here
we describe highly efficient continuous four-wave mixing in the VUV by using
three different fundamental wavelengths with a sophisticated choice of
detunings to resonances of the nonlinear medium. Up to 6 microwatts of vacuum
ultraviolet radiation at 121 nm can be generated which corresponds to an
increase of three orders of magnitude in efficiency.Comment: 11 pages, 3 figure
Vacuum ultraviolet radiation and solid state physics Semiannual status report no. 7, period ending 31 Aug. 1965
Vacuum ultraviolet radiation and solid state physics - optical constants for barium and silver surfaces and thin film
Effect of environment on thermal control coatings Final report
Thermal control coating degradation under vacuum and ultraviolet radiation by chemical change of photoproduced holes and electron
The Quantasyn, an improved quantum detector
Quantasyn provides absolute measurement of radiation flux in the range 1000 A to 4500 A and into the vacuum ultraviolet. This radiation detector cimbines the high quantum efficiency and inherent linearity of the silicon solar cell with the constant quantum response of the fluorescent organic compound liumogen
Fundamental investigation of ultraviolet radiation effects in polymeric film-forming materials
A literature search from 1958 to present was conducted on the effect of ultraviolet radiation on polymeric materials, with particular emphasis on vacuum photolysis, mechanisms of degradation, and energy transfer phenomena. The literature from 1958 to 1968 was searched manually, while the literature from 1968 to present was searched by using a computerized keyword system. The primary objective was to provide the necessary background information for the design of new or modified materials with improved stability to the vacuum-radiation environment of space
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