scholarly journals A digital technology for scanning the luminescent characteristics of alkali halide crystals

2021 ◽  
Vol 80 (2) ◽  
pp. 55-61
Author(s):  
А. G. Мarатоvа ◽  
◽  
Zh. К. Ubayev ◽  
К. Sh. Shunkeyev ◽  
L. N. Myasnikova ◽  
...  
Keyword(s):  
Digital Technology ◽  
Alkali Halide ◽  
Graphical Representation ◽  
Photon Counting ◽  
Scanning Speed ◽  
Luminescence Spectra ◽  
Special Programs ◽  
Mathematical Processing ◽  
Alkali Halide Crystals ◽  
Photon Counting Mode

A digital technology for scanning the X-ray luminescence, tunnel luminescence, and thermostimulated luminescence spectra in the spectral range from 200 nm to 850 nm is experimentally demonstrated using the example of a NaCl crystal, which is part of the group of alkali halide crystals. This is done with the specified spectrum intervals and scanning speed using a high-aperture monochromator MSD-2 and a photoelectronic multiplier type H 8259 of the company “Hamamatsu”, operating in the photon counting mode, controlled by special programs SpectraScan and ThermoScan. The obtained experimental data are digitally converted for further processing of the graphical representation of the results using the OriginPro software package, which allows you to draw up graphical dependencies of the spectra and perform their mathematical processing.

PHONON BROADENING OF EMISSION SPECTRA FOR STE AND AUGER-FREE LUMINESCENCE

2001 ◽  
Vol 15 (28n30) ◽  
pp. 4032-4035 ◽  
Author(s):  
V. N. MAKHOV ◽  
V. N. KOLOBANOV ◽  
M. KIRM ◽  
S. VIELHAUER ◽  
G. ZIMMERER
Keyword(s):  
Alkali Halide ◽  
Lattice Structure ◽  
Thermal Quenching ◽  
Emission Spectra ◽  
Luminescence Spectra ◽  
Phonon Modes ◽  
Exciton Emission ◽  
Different Types ◽  
Alkali Halide Crystals ◽  
Typical Temperature

The temperature dependencies of the bandwidths for self-trapped exciton emission spectra in several alkali halide crystals with high temperature of thermal quenching for self-trapped exciton emission (NaBr, KI, CsI) have been studied and compared with a typical temperature behavior of Auger-free luminescence spectra. It was shown that different phonon modes are responsible for broadening of emission band for different types of self-trapped excitons as well as for different bands in the spectrum of Auger-free luminescence. The features found indicate that the lattice structure of emitting state for Auger-free luminescence has most probably the on-center character.

Anion polarizability functions in alkali halide crystals

1997 ◽  
Vol 92 (6) ◽  
pp. 1029-1033
Author(s):  
A. BATANA ◽  
J. BRUNO ◽  
R.W. MUNN
Keyword(s):  
Alkali Halide ◽  
Alkali Halide Crystals

Effect of the activator impurity on the scintillation yield in alkali-halide crystals

2014 ◽  
Vol 252 (2) ◽  
pp. 380-385 ◽  
Author(s):  
A. Gektin ◽  
S. Gridin ◽  
S. Vasyukov ◽  
A. Vasil'ev ◽  
A. Belsky ◽  
...  
Keyword(s):  
Alkali Halide ◽  
Alkali Halide Crystals

scholarly journals UVscope and its application aboard the ASTRI-Horn telescope

2021 ◽  
Author(s):  
Maria Concetta Maccarone ◽  
Giovanni La Rosa ◽  
Osvaldo Catalano ◽  
Salvo Giarrusso ◽  
Alberto Segreto ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Single Photon ◽  
Photon Counting ◽  
Light Flux ◽  
Cosmic Ray ◽  
High Energy ◽  
Wide Field ◽  
High Energy Astrophysics ◽  
Single Photon Counting ◽  
Photon Counting Mode

AbstractUVscope is an instrument, based on a multi-pixel photon detector, developed to support experimental activities for high-energy astrophysics and cosmic ray research. The instrument, working in single photon counting mode, is designed to directly measure light flux in the wavelengths range 300-650 nm. The instrument can be used in a wide field of applications where the knowledge of the nocturnal environmental luminosity is required. Currently, one UVscope instrument is allocated onto the external structure of the ASTRI-Horn Cherenkov telescope devoted to the gamma-ray astronomy at very high energies. Being co-aligned with the ASTRI-Horn camera axis, UVscope can measure the diffuse emission of the night sky background simultaneously with the ASTRI-Horn camera, without any interference with the main telescope data taking procedures. UVscope is properly calibrated and it is used as an independent reference instrument for test and diagnostic of the novel ASTRI-Horn telescope.

scholarly journals Detectivity optimization to detect of ultraweak light fluxes with an EM-CCD as binary photon counter array

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ibtissame Khaoua ◽  
Guillaume Graciani ◽  
Andrey Kim ◽  
François Amblard
Keyword(s):  
Dynamic Range ◽  
Signal To Noise Ratio ◽  
Photon Counting ◽  
Detection Methods ◽  
Strong Nonlinearity ◽  
Wide Range ◽  
Depth Analysis ◽  
Spatially Extended ◽  
Extended Sources ◽  
Photon Counting Mode

AbstractFor a wide range of purposes, one faces the challenge to detect light from extremely faint and spatially extended sources. In such cases, detector noises dominate over the photon noise of the source, and quantum detectors in photon counting mode are generally the best option. Here, we combine a statistical model with an in-depth analysis of detector noises and calibration experiments, and we show that visible light can be detected with an electron-multiplying charge-coupled devices (EM-CCD) with a signal-to-noise ratio (SNR) of 3 for fluxes less than $$30\,{\text{photon}}\,{\text{s}}^{ - 1} \,{\text{cm}}^{ - 2}$$ 30 photon s - 1 cm - 2 . For green photons, this corresponds to 12 aW $${\text{cm}}^{ - 2}$$ cm - 2 ≈ $$9{ } \times 10^{ - 11}$$ 9 × 10 - 11 lux, i.e. 15 orders of magnitude less than typical daylight. The strong nonlinearity of the SNR with the sampling time leads to a dynamic range of detection of 4 orders of magnitude. To detect possibly varying light fluxes, we operate in conditions of maximal detectivity $${\mathcal{D}}$$ D rather than maximal SNR. Given the quantum efficiency $$QE\left( \lambda \right)$$ Q E λ of the detector, we find $${ \mathcal{D}} = 0.015\,{\text{photon}}^{ - 1} \,{\text{s}}^{1/2} \,{\text{cm}}$$ D = 0.015 photon - 1 s 1 / 2 cm , and a non-negligible sensitivity to blackbody radiation for T > 50 °C. This work should help design highly sensitive luminescence detection methods and develop experiments to explore dynamic phenomena involving ultra-weak luminescence in biology, chemistry, and material sciences.

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