Cerenkov emission

Morgan TL, Redpath JL, Ward JF (1984a) Induction of lethal damage in E. coli by Cerenkov emission associated with high-energy X-rays the effect of bromouracil substitution. Int J Radiat Biol 45 217-226... 

Morozov II, Myasnik MN (1980) The relationship between the phenomenon of photoreactivation in Escherichia coli following ionizing radiation and Cerenkov emission. Radiat Res 82 336-341 Moss SH, Smith KC (1980) Cerenkov ultraviolet radiation (137Cs y-rays) and direct excitation (137Cs y-rays and 50 kVp X-rays) produce photoreactivable damage in Escherichia coli. Int J Radiat Biol 38 323-334... 

Access to subpicosecond electron pulses has already been achieved at Osaka University by a new double-decker accelerator concept. In order to reduce the time jitter for the detection of the optical absorption signals in pulse radiolysis studies, the light pulse used for the pump-probe system is Cerenkov emission which is produced in the same cell by a synchronized second electron beam and is concomitant with the electron path. The distance between the axes of the two beams is 1.6 mm. The pulse durations of these electron pulses, which are both produced by delayed beams issued from the same laser, are 430 + 25 fs and 510 20 fs, respectively, and the charge per pulse is 0.65 nC. An electron bunch of 100 fs and 0.17 nC has already been generated. 

The pulse-probe technique can be extended to multiwavelength detection by using the ultrafast laser pulse to generate a white-light continuum probe, which can be dispersed with a spectrograph across a diode array or CCD detector after traversing the sample. Due to lower probe intensity, Cerenkov emission from the sample would be expected to be more of a complication in this case, but the correction methods developed for stroboscopic Cerenkov detection would also work here. 

Carbon, analysis, 217, 318, 319 Carbon brushes, examination by x-ray absorptiometry, 97 Cathode follower, 60 Cauchois arrangement, 119, 120, 123 Caustic circle, 119, 120 Cells for liquids, 191, 194 Cements, analysis in Applied Research Laboratories PXQ, 260, 261 Ceramics, analysis by x-ray emission spectrography, 222-224 Cerenkov radiation, 43 Cesium, determination by x-ray emission spectrography, 328 Characteristic-line generator of Eng-strom, 144... 

Cerenkov radiation emission of blue hght by particles moving faster than light in a medinm other than the vacuum (note that in a medinm with refrachve index n, hght moves with speed v = cjn)... 

Another mechanism for electron energy loss in matter is the emission of Cerenkov radiation. When a beam of fast moving charged particles with a velocity... 

Figure 3. Spectral response of photometer system. Curve A is the emission spectrum of Cerenkov light from irradiated quartz. Curves By C, and D show the photometer response using Bausch and Lomh gratings. Curve B, ultra-violet grating type 33-86-01, no filter. Curve C, visible grating type 33-86-02, no filter. Curve D, visible grating type 33-86-02, using the Chance filters...

Fig. 5. High repetition rate pulsed excitation systems for picosecond absorption and emission studies, (a) Pulsed e -beam with Cerenkov or laser probe pulses (b) actively mode-locked, synchronously pumped argon ion jet stream dye laser. See text for further details.

Fig. 2 Schematic illustration of dispersion c irves of an acoustic phonon, a band electron and an acoustic polaron. The band electron is undergoing Cerenkov scattering by emission of a phonon q. The acoustic polaron is undergoing Doppler shifted phonon bouncing, the incident phonon -qi scattering as +q2 ...

Either of D// or Di can provide the coupling. For sinyplicity the results are given for either D// or Dl existing (if both exist then Dl dominates). A characteristic parameter F and angle 6 exist % is the maximum angle of Cerenkov phonon emission, by a thermal electron, allowed by the selection rules Eq. (3), and... 

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