Luminescence Produced on

For such study, the expl charge (usually cylindrical) is mounted with its axis parallel to, and in line with, the slit of the camera. 

A photo obtd in this way from the deton wave of a granular expl consists of a sharp bright line followed by luminous effects which are usually less intense. This is clearly shown in Plate I given in Ref 5 and reproduced here 

In this case it is assumed that the leading edge of the photographic trace represents the progress of deton front along the cartridge (Ref 5, p 30) 

If an expl contains occluded gas, such as in case of granular expls, the light is 

Plate I. Typical high-speed camera photograph. The detonation velocity is 4,850 m./sec. The diagram shows the arrangement of the explosive and camera and the method of interpretation 

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Detonation, Convergence Effect in. See under Detonation (and Explosion), Luminosity (Luminescence), Produced on... 

Light Emission (Luminosity Effects) from Detonations and Explosions. See Detonation (and Explosion), Luminosity (Luminescence) Produced on in Encycl 4, (1969), D425-L to D434-L, and Detonation (and Explosion) Spectra and Spectrographic Measurements in , D548-R to D549-L... 

See Detonation (and Explosion) Luminosity (Luminescence) Produced on in Vol 4, pp D425-L to D434-L (21 refs)... 

Purified LBP is obtained from the crude LBP separated in the gel filtration of the 35 kDa luciferase on Sephadex G-100 (see Fig. 8.2). The fractions of crude LBP are combined and the protein is precipitated with ammonium sulfate (75% saturation). The precipitate is dissolved in a small volume of lOmM Tris-HCl/5 mM 2-mercaptoethanol, pH 8, and a small amount of luciferin is added as a tracer. Then, the crude LBP is purified on a column of Sephadex G-200 (Hastings and Dunlap, 1986). The fractions of LBP are identified by luminescence produced by the addition of luciferase at pH 6.3 the luminescence due to the tracer luciferin is proportional to the amount of LBP in each fraction. 

When an ion-pair recombines, it may form an excited state which can luminesce. The intensity of luminescence is a direct monitor of the competing ratio of recombination and luminescence. With steady-state conditions, the luminescence intensity is proportional to the rate of recombination. For instance, Morrow et al. [380] have radio lysed solutions of pyrene in cyclohexane. Solvated electrons and pyrene cations are produced. On recombination, an excited singlet state is produced which can fluoresce. If two pyrene molecules are in (or near) contact when one or other molecule is in the excited singlet state, then excimer fluorescence may be observed. The intensity of fluorescence can be decreased by application of an electric field, since fewer ion-pairs recombine to form the excited state. Jarnagin [381] and Holroyd and Russell [382] have photoionised iVjA iV. iV -tetramethyl-p-phenylenedia-mine (TMPD) with light (of photon energy 5.5—6 eV) in hydrocarbon solvents and measured the photocurrent at various electric field strengths. 

Sects. 4.1 and 4.2). The fluorescence of the substrate changes upon complexation of the metal ions, thus a fluorescent pattern is produced at the same time than the metal ion pattern on the substrate. A combinatorial approach for the fabrication of metal ions and luminescent patterns on 2D materials can be envisioned, where libraries of patterns can be produced from different combinations of metal ions and individual substrates of a monolayer library. 

While investigating the nature of cathode rays produced in a Crookes mbe that he had covered with a shield of black cardboard, ostensibly to prevent the cathode rays from escaping, Roentgen (Fig. 3.17) observed in 1895 the luminescent effect on a... 

AIN ceramics reveals luminescence under exposure of radiation of different types - a and p beams, y. X-rays, and UV light. In this paper, we will pay attention mostly to properties of luminescence produced by UV light irradiation, as well as stop briefly on luminescence properties produced by ionizing radiation, which potentially can be used in dosimetry. The experimental results mentioned in this chapter are described in detail in our previous works [27—41]. 

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