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Шуаибов, А. К.; Shimon, L. L.; Шевера, І. В.; Dashchenko, A. I.

doi:10.1023/a:1020459631600

“…The procedure of measuring the power of UV radiation of plasma, described in earlier papers [9,10], was based on selecting a small area of diameter d on the radiating surface of the discharge and treating it as a point area. The interelectrode spacing in the lamp was 30 mm, with an inside diameter of the tube of 14 mm.…”

Section: Experimental Equipment and Conditionsmentioning

confidence: 99%

Phase equilibrium and PVT-properties of 0.7223H2O + 0.1242 n-C6 H14 + 0.1535 n-C3H7OH ternary system

Шуаибов

¹

,

Шевера

²

,

General

³

2005

High Temp

0

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Results are given of an investigation of the electrical and optical characteristics of the plasma of a longitudinal high-frequency discharge in a krypton/chlorine mixture (P ≤ 1000 Pa). The high-frequency discharge is ignited in a cylindrical quartz tube with an inside diameter of 14 mm and a distance between the anode and cathode of 30 mm. The dynamics of current and radiation of the high-frequency discharge utilizing krypton/chlorine mixtures of different compositions and pressures are investigated. It is found that a longitudinal high-frequency in a krypton/chlorine mixture is a broadband excimer-halogen emitter in the 200-260 nm spectral range. The ultraviolet spectrum of the lamp is formed as a result of overlapping of broadened radiation bands of chlorine and krypton chloride molecules (200 nm , 222 nm KrCl, and 257 nm ). The optimal composition of a Kr/Cl 2 mixture is determined, which is necessary to obtain the maximal power of ultraviolet radiation.

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“…The time resolution did not exceed 5-10 ns. The procedure of measuring the power of UV radiation of plasma, described in earlier papers [9,10], was based on selecting a small area of diameter d on the radiating surface of the discharge and treating it as a point area. After that, the radiation power was measured by the standard photometric procedure using a Kvarts-01 optical radiation power meter.…”

Section: Experimental Equipment and Conditionsmentioning

confidence: 99%

Low-pressure ultraviolet emitter utilizing chlorine and krypton chloride molecules

Шуаибов

¹

,

Шевера

²

,

General

³

2004

High Temp

Self Cite

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0

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Results are given of an investigation of the electrical and optical characteristics of the plasma of a longitudinal high-frequency discharge in a krypton/chlorine mixture (P ≤ 1000 Pa). The high-frequency discharge is ignited in a cylindrical quartz tube with an inside diameter of 14 mm and a distance between the anode and cathode of 30 mm. The dynamics of current and radiation of the high-frequency discharge utilizing krypton/chlorine mixtures of different compositions and pressures are investigated. It is found that a longitudinal high-frequency in a krypton/chlorine mixture is a broadband excimer-halogen emitter in the 200-260 nm spectral range. The ultraviolet spectrum of the lamp is formed as a result of overlapping of broadened radiation bands of chlorine and krypton chloride molecules (200 nm , 222 nm KrCl, and 257 nm ). The optimal composition of a Kr/Cl 2 mixture is determined, which is necessary to obtain the maximal power of ultraviolet radiation.

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“…The iodine vapor pressure in the discharge tube was estimated by the temperature of its coldest part and was no higher than . The characteristics of the glow discharge and the total power of the UV radiation from the lamp were measured using the technique described in [13,14].Abstract -A UV lamp pumped by a dc-current glow discharge in a mixture of helium with iodine vapors inside a quartz discharge tube with an interelectrode distance of 50 cm is described. For the power deposited in discharge ( W el ≤ 200 W), the total power emitted by the lamp in the spectral range 200-350 nm is as high as 27 W with an efficiency of ≤ 18 %.…”

mentioning

confidence: 99%

“…The iodine vapor pressure in the discharge tube was estimated by the temperature of its coldest part and was no higher than . The characteristics of the glow discharge and the total power of the UV radiation from the lamp were measured using the technique described in [13,14].…”

mentioning

confidence: 99%

A continuously emitting electric discharge UV lamp

Шуаибов

¹

,

Grabovaya

²

2005

Instrum Exp Tech

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High-power ultraviolet (UV) and vacuum ultraviolet (VUV) radiations from monohalides of noble gases are currently widely used in the technologies of microelectronics, photochemistry, and ecology, and in agriculture and medicine [1][2][3]. Eximer-halogen lamps pumped by a dc-current glow discharge [4][5][6][7] are the most powerful and efficient stationary sources of spontaneous UV-VUV radiation. The main focus in the development of such lamps is studying the characteristics of mixtures of noble gases with fluorine-and chlorine-containing molecules. Since such gaseous mixtures are highly corrosive, the service life of these radiation sources in the gas-static mode is 1-100 h.Studies of a UV lamp operating on mixtures of noble gases with less corrosive halogen carriers (iodine molecules [8]) showed that the service life of a continuously operating lamp is as long as 1000 h at high values of the mean power and the emission efficiency. The operation of such a UV radiator was optimized only at an iodine atom resonance line of 206.2 nm. Studies of the emission characteristics of a glow discharge in Xe/I 2 and He/Xe/I 2 mixtures at a power of ≤ 100 W deposited into the plasma [9][10][11] showed that, apart from atomic iodine emission, the broadband emission of XeI( B -X ) (253 nm) and XeI( B -X ) (342 nm) molecules is also important: the fraction of molecular emission from the glow discharge plasma on iodine vapors can be as high as approximately half the total UV radiation of the lamp.This work presents the results from developing and optimizing the output characteristic of a high-power, low-pressure electric discharge lamp operating in a continuous emission mode on a mixture of helium with iodine vapors.A longitudinal glow discharge was formed in a discharge tube 1.4 cm in diameter made of UV-brand quartz, transparent to wavelengths of <190 nm. The interelectrode distance was 50 cm. Hollow nickel cylinders 1.4 cm in diameter and 1.5 cm in length served as the lamp electrodes. High-purity crystalline iodine was placed in a special branch behind the lamp anode (Fig. 1).The emission characteristics of the lamp were measured using a îùì-106 photomultiplier (PMT) and an åÑê-2 monochromator (a diffraction grating with 1200 groves/mm and a holographic diffraction grating with 2400 groves/mm). The PMT and monochromator were preliminarily calibrated using the relative spectral sensitivity in the spectral range 190-400 nm.A glow discharge was initiated in the lamp using a high-voltage rectifier (with a mean current of ≤ 80 mA and a voltage of ≤ 10 kV). Before being filled with helium, the quartz tube was evacuated to a residual pressure of 5-7 Pa. The lamp was cooled with a fan so that the temperature of the iodine-filled branch was close to room temperature and, at the maximum energy deposition into the glow discharge, exceeded it by ≥ 10-15°ë . The iodine vapor pressure in the discharge tube was estimated by the temperature of its coldest part and was no higher than . The characteristics of the glow discharge and the total po...

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Cited by 5 publications

References 1 publication

Phase equilibrium and PVT-properties of 0.7223H2O + 0.1242 n-C6 H14 + 0.1535 n-C3H7OH ternary system

Phase equilibrium and PVT-properties of 0.7223H2O + 0.1242 n-C6 H14 + 0.1535 n-C3H7OH ternary system

Low-pressure ultraviolet emitter utilizing chlorine and krypton chloride molecules

A continuously emitting electric discharge UV lamp

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