Control of the Output from a High-Intensity Xenon Arc Lamp

1976 ◽  
Vol 46 (5) ◽  
pp. 342-346
Author(s):  
J. D. Cooney ◽  
D. M. Wiles
Keyword(s):  
High Pressure ◽  
Emission Spectrum ◽  
High Intensity ◽  
Laboratory Testing ◽  
Visible Region ◽  
Testing Equipment ◽  
Xenon Lamp ◽  
Reasonable Approximation ◽  
Methods Of Operation ◽  
Main Factor

The emission spectrum of a xenon high-pressure arc lamp provides a reasonable approximation to the ultraviolet-visible region of terrestrial sunlight. This lamp has therefore been employed in a variety of laboratory testing equipment designed to predict the useful outdoor lifetime of plastics, textiles, dyes, asphalt, etc. Several methods of operation (ASTM and Atlas) of an Atlas 6000W xenon arc Weather-Ometer have been examined, and the necessity of monitoring intensities at both ultraviolet (at 340 nm) and visible (at 420 nm) wavelengths is illustrated. Lamp aging has been found to be the main factor in decreasing lamp intensity. Xenon lamp control at intensities similar to noon summer sunlight at 340 nm gives short lamp lifetimes of approximately 400 h. Operation of the arc at lower wattages (3500–5000W) has been found to provide a stable lamp intensity for much longer periods—approximately 2000 h.

High pressure effects on the multiplet structure of the emission spectrum of coronene in a n‐alkane matrix

1977 ◽  
Vol 66 (2) ◽  
pp. 875-876 ◽  
Author(s):  
M. Lamotte ◽  
S. Risemberg ◽  
A. M. Merle ◽  
J. Joussot‐Dubien
Keyword(s):  
High Pressure ◽  
Emission Spectrum ◽  
Pressure Effects ◽  
Multiplet Structure ◽  
High Pressure Effects

scholarly journals Emission spectrum of an electric-ionization high-pressure carbon dioxide laser

1974 ◽  
Vol 4 (2) ◽  
pp. 185-188
Author(s):  
V A Ageikin ◽  
Viktor N Bagratashvili ◽  
I N Knyazev ◽  
Yu A Kudryavtsev ◽  
V S Letokhov
Keyword(s):  
Carbon Dioxide ◽  
High Pressure ◽  
Emission Spectrum ◽  
Carbon Dioxide Laser

Cubic Boron Nitride as a New Semiconductor for Optoelectronics: Luminescence Properties and Potentialities

1989 ◽  
Vol 162 ◽  
Author(s):  
Koh Era ◽  
Osamu Mishima
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Boron Nitride ◽  
Room Temperature ◽  
Cubic Boron Nitride ◽  
Visible Region ◽  
Vibrational Structure ◽  
Luminescence Properties ◽  
Optoelectronic Applications ◽  
P Type

ABSTRACTIn cubic boron nitride made by high pressure and high temperature technique in our institute, we have found three luminescence bands in the ultraviolet and the short visible region at room temperature by cathode-ray excitation. They are: a band having vibrational structure and ascribable to undoped state of the crystal, a band ascribable to p-type doping and a band ascribable to n-type doping. Discussion is made on differences between the injection luminescence and the cathodoluminescence. Potentialities and difficulties in realizing the potentialities of cBN for optoelectronic applications are discussed.

scholarly journals Synthesis and Photocatalytic Activity of Mo-Doped TiO2Nanoparticles

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Ji-guo Huang ◽  
Xue-ting Guo ◽  
Bo Wang ◽  
Lin-yang Li ◽  
Mei-xia Zhao ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Crystallite Size ◽  
Lattice Distortion ◽  
Visible Region ◽  
Photoelectron Spectra ◽  
Solar Light ◽  
Xenon Lamp ◽  
X Ray ◽  
Mo Doping

The undoped and Mo-doped TiO2nanoparticles were synthesized by sol-gel method. The as-prepared samples were characterized by X-ray diffraction (XRD), diffuse reflectance UV-visible absorption spectra (UV-vis DRS), X-ray photoelectron spectra (XPS), and transmission electron microscopy (TEM). The photocatalytic activity was evaluated by photocatalytic degradation of methylene blue under irradiation of a 500 W xenon lamp and natural solar light outdoor. Effects of calcination temperatures and Mo doping amounts on crystal phase, crystallite size, lattice distortion, and optical properties were investigated. The results showed that most of Mo6+took the place of Ti4+in the crystal lattice of TiO2, which inhibited the growth of crystallite size, suppressed the transformation from anatase to rutile, and led to lattice distortion of TiO2. Mo doping narrowed the band gap (from 3.05 eV of TiO2to 2.73 eV of TiMo0.02O) and efficiently increased the optical absorption in visible region. Mo doping was shown to be an efficient method for degradation of methylene blue under visible light, especially under solar light. When the calcination temperature was 550°C and the Mo doping amount was 2.0%, the Mo-doped TiO2sample exhibited the highest photocatalytic activity.

THE EMISSION SPECTRUM OF THE PbBr MOLECULE

1967 ◽  
Vol 45 (11) ◽  
pp. 3663-3666 ◽  
Author(s):  
K. M. Lal ◽  
B. N. Khanna
Keyword(s):  
Emission Spectrum ◽  
Visible Region ◽  
Second Order ◽  
Rotational Analysis ◽  
Rotational Constants ◽  
Concave Grating

The emission spectrum of the A–X system of the PbBr molecule in the region 4 600–5 900 Å has been obtained in the second order of a 21-ft concave grating spectrograph (15 000 lines per inch) with a dispersion of 1.25 Å/mm. A rotational analysis of four bands—(3, 2), (2, 2), (3, 1), and (4, 1)—of this system has been done, leading to the determination of the following rotational constants:[Formula: see text]The system appears to be similar to the A-X system of the PbCl molecule in the visible region, and a [Formula: see text] transition has been suggested.

Many-body effects in the emission spectrum of ZnTe under high-intensity photoexcitation

1979 ◽  
Vol 19 (8) ◽  
pp. 4149-4153 ◽  
Author(s):  
A. Cingolani ◽  
M. Ferrara ◽  
M. Lugarà
Keyword(s):  
Emission Spectrum ◽  
High Intensity ◽  
Many Body ◽  
Many Body Effects
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