Image intensifier studies of crystalloluminescence of NaCl

Gibbon, M.A.; Sopp, H

doi:10.1088/0022-3719/21/10/011

Cited by 11 publications

(9 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Intriguingly, flashes of light are indeed observed during fast crystallization of many dielectric materials, which exhibit phononpolariton resonances. This phenomenon is known since 18 th century as crystalloluminescence [34]. Unfortunately, these observations may only be treated as the "Big Flash" events if similar flashes are observed in the mid IR range, or some mechanism of photon up-conversion will be confirmed.…”

mentioning

confidence: 99%

Metric Signature Transitions in Optical Metamaterials

2010

View full text Add to dashboard Cite

PACS numbers: 78.20.Ci, 42.25.Bs, 71.36.+c, The unprecedented degree of control of the local dielectric permittivity ε ik and magnetic permeability μ ik tensors in electromagnetic metamaterials has fueled recent explosion in novel device ideas, and resulted in discovery of new physical phenomena. Advances in experimental design and theoretical understanding of metamaterials greatly benefited from the field theoretical ideas developed to describe physics in curvilinear space-time. Theoretical investigation of the 2T higher dimensional space-time models had been pioneered by Paul Dirac [12]. More recent examples can be found in [13,14]. Metric signature change events (in which a phase transition occurs between say (-,+,+,+) and (-,-,+,+) space-time signature) are being studied in Bose-Einstein condensates and in some modified gravitation theories (see ref. [15], and the references therein). In general, it is predicted that a quantum field theory residing on a spacetime undergoing a signature change reacts violently to the imposition of the signature change. Both the total number and the total energy of the particles generated in a signature change event are formally infinite [15]. Therefore, such a metric signature transition can be called a "Big Flash", which shares some similarities with the cosmological "Big Bang". A metamaterial model of a metric signature change event should be extremely interesting to observe. Unlike usual phase transitions, in which the physical system changes while the background metric is intact, the signature change transition affects the underlying background metric experienced by the system. Therefore, signature change events

show abstract

mentioning

confidence: 99%

Metric Signature Transitions in Optical Metamaterials

2010

View full text Add to dashboard Cite

show abstract

“…In such cases it is useful to be able to relate the signal from the detector to the strength of the source. Assume that n quanta per unit volume are emitted at a given wavelength X into the solid angle 4-rr in an infinite ocean and that a detector of area A is situated at the center of a hemispherical shell radius r and thickness dr, as shown in Figure A1 and the results viewed with an image intensifier, a few seconds after the mixing the screen is covered with scintillations that look like twinkling stars; spots vary in size (i.e., number of photons) and appear in random locations [Gibbon et al, 1988]. When a vidicon is used to view the intensifier and record it on videotape, playback permits frame-by-frame analysis.…”

Section: Seismic Lightmentioning

confidence: 99%

“…Observations have been made with image intensifiers as well as with photomultipliers. When concentrated HC1 is added to a saturated NaC1 solution and the results viewed with an image intensifier, a few seconds after the mixing the screen is covered with scintillations that look like twinkling stars; spots vary in size (i.e., number of photons) and appear in random locations [Gibbon et al, 1988]. When a vidicon is used to view the intensifier and record it on videotape, playback permits frame-by-frame analysis.…”

Section: Processes Producing Light In the Visiblementioning

confidence: 99%

Sources of light in the deep ocean

Reynolds

Lutz²

2001

Reviews of Geophysics

View full text Add to dashboard Cite

Abstract. Studies during recent decades have shown that the deep ocean (depths below where solar luminance plays a direct environmental role) is far from a dark, cold, lifeless region. Evidence obtained by utilizing a variety of photo-optical devices, providing spatial, temporal, and spectral information, has demonstrated that this portion of the Earth is a region rich in life and light. Findings to date have provided challenges for geologists, physicists, biologists, chemists, and oceanographers, and the sharing of techniques and expertise among these disciplines has demonstrated the rewards to be gained from interdisciplinary research. Bioluminescence has been found far below the depths at which it has received most attention historically. The study of this phenomenon is complicated by the fact that the measuring apparatus itself causes a stimulation of the luminescence so that a true background will be difficult to determine.Nuclear physics has played a role in that the electron resulting from the decay of an isotope of potassium (K 4ø) provides an ubiquitous background of light through a process known as Cerenkov radiation. The possibility of light generated by cosmic rays must also be taken into account. An intriguing source of light at the very bottom of the sea is found at hydrothermal vents. Here are found not only light but also abundant life. At the vent orifice, temperatures are found to be as high as 250ø-400øC. A large component of the light is due to thermal radiation. However, the light in the wavelengths 450-600 nm is significantly greater than the thermal flux at those wavelengths. Identifying the physical mechanisms that may account for this excess is important in providing insight into the processes occurring in the vents and plumes and in the accompanying ecosystem. INTRODUCTIONThe ocean covers over 70% of the Earth's surface.The average overall depth of the ocean is approximately 3900 m, and over 75% of the ocean is at a depth between 3000 and 6000 m. The volume of the ocean is more than 10 times the volume of land above sea level [Herring, 1971]. Sunlight is absorbed exponentially and is restricted to relatively very shallow depths, depending greatly on local conditions. It is sometimes stated that at depths below the limit of the continental shell (200 m) the ocean is "dark," and some authors take depths beyond 200 m to be "deep ocean." It is more reasonable to put 1000 rn as the beginning of the deep ocean (the limit of the mesopelagic zone), where only a few animals It has also been known for many years that low-level ambient light in the deep ocean is due to the passage of ionizing cosmic ray particles and ions from the decay of naturally occurring radioactive elements, primarily the isotope of potassium, 4øK.The relatively recent discovery of deep-sea hydrothermal vents, and that there is light at and near the orifice of many of them, has been an important development of interest to geologists, physicists, biologists, chemists, oceanographers, and Earth resource scientists. Each of the...

show abstract

“…XTL occurs during rapid crystallization of a mineral (i.e., NaCI) from an aqueous solution [Gibbon et al, 1988]. Garten and Head [1963; suggest that light emission is derived from the energy released during a phase change.…”

Section: Tribo-and Crystalloluminescencementioning

confidence: 99%

An investigation into the characteristics and sources of light emission at deep-sea hydrothermal vents

White¹

2000

View full text Add to dashboard Cite

Image intensifier studies of crystalloluminescence of NaCl

Cited by 11 publications

References 7 publications

Metric Signature Transitions in Optical Metamaterials

Metric Signature Transitions in Optical Metamaterials

Sources of light in the deep ocean

An investigation into the characteristics and sources of light emission at deep-sea hydrothermal vents

Contact Info

Product

Resources

About