共查询到20条相似文献,搜索用时 15 毫秒
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S. M. Avdeev A. M. Boichenko E. A. Sosnin V. F. Tarasenko S. I. Yakovlenko 《Laser Physics》2007,17(9):1119-1123
Spectral and energy characteristics of a barrier-discharge excilamp on a mixture of krypton with bromine and chlorine molecules that emits in the range 200–300 nm are presented. The radiation spectrum contains the bands of the B → X transitions of the KrCl* (222 nm) and KrBr* (207 nm) molecules and the band of the D′ → A′ transition of the Br*2 molecule (291 nm). It is demonstrated that the bromine content must be higher than the chlorine content in the triple (Kr?Cl2?Br2) mixtures that are optimal with respect to the radiant power. A radiant power of 0.7 W and an efficiency of 3% are realized. A multiband barrier-discharge excilamp based on the triple mixture exhibits a potentially long lifetime. 相似文献
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The density and the dielectric constant of three dense argon-krypton mixtures have been measured at 25°C and up to 8000 bar. For density measurements a constant volume method is used. The dielectric constant is determined by a capacitance measurement. The polarizability of the three mixtures is studied as a function of density. 相似文献
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The emission characteristics of a pulse-periodic excilamp with three dielectric barriers based on the 222-nm KrCl(X-B) and 248-nm KrF(X-B) emission bands have been investigated. The working gases of the lamp were mixtures of krypton with low-aggressivity halogen carriers (SF6, CCl4). Optimal compositions of Kr-SF6 and Kr-CCl4 mixtures for obtaining the maximum intensity of the system of 222-nm KrCl(X-B) and 248-nm KrF(X-B) bands have been determined. The results of lamp optimization depending on the parameters of the source of pulse-periodic short-duration barrier discharge are presented. 相似文献
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A K-N2 mixture is irradiated in a glass fluorescence cell with pulses of 710hm radiation from an OPO laser, populated K2 (^1∧g) state by two-photon absorption. The cross section for ^1∧g →^3∧g transfer in K2 is determined using molecular fluorescence spectrometry. The cell temperature is kept constant at 553K. The N2 pressure is varied between 40 Pa and 400 Pa. The effects of K2-K collisions could not be neglected. These effects are subtracted out by using the results of the pure K experiment. The cross sections are (3.8 ± 1.5) ×10^-15 cm^2 for K2 (^1∧g) + N2 → K2(^3∧g) +N2 and (8.9 ± 3.5) × 10^-15 cm^2 for K2 (^3∧g) collisions with N2. 相似文献
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Using Hanle experiments in a discharge, the radiative lifetimes of 7 out of the ten 2p-levels of krypton have been studied as well as the cross-sections for the destruction of alignment in these levels by collisions with ground-state krypton atoms. The limitations of the present experimental method are emphasized and plans for future improvements are formulated. 相似文献
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Performance of the Transition Radiation Tracker (TRT) at the ATLAS experiment with argon and krypton gas mixtures was simulated. The efficiency of transition radiation registration, which is necessary for electron identification, was estimated along with the electron identification capabilities under such conditions. 相似文献
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K. Unnikrishnan 《Physics letters. A》1982,90(8):402-404
The problem of energy degradation of electrons in krypton has been investigated using the Monte Carlo method. The results are presented as the probability distributions of the number of ionizations, the Fano factor, the mean energy per ion pair and the degradation spectra for source energies up to 4 keV. 相似文献
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The emission characteristics of the plasma of repetitively pulsed spontaneous UV-VUV radiation sources on the basis of ArF* (193 nm) and KrF* (249 nm) molecules, and the products of decomposition of sulfur hexafluoride molecules pumped by a transverse volume discharge in a mixture of inert gases with sulfur hexafluoride molecules have been investigated. The discharge emission spectra in the range of 190–780 nm at the low-current and high-current stages of the transverse discharge, the time characteristics of the voltage across the electrodes, the pump current, and the emission of excimer molecules and the products of decomposition of sulfur hexafluoride have been studied. It is shown that, in the gas-static operation mode of the radiator at the number of discharge pulses smaller than 103, the 193-nm ArF* and 249-nm KrF* bands are main in the emission spectrum. Upon further operation of the radiator, a spectral continuum is formed on the basis of sulfur molecular bands in the range 260–550 nm. 相似文献
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G. D'Erasmo I. Iori S. Micheletti A. Pantaleo 《Zeitschrift für Physik A Hadrons and Nuclei》1981,299(1):41-45
Proton inelastic excitation spectra of12C have been measured imposing a coincidence with alpha decay to8Beg.s. and8Be2.9MeV. In plane angular correlations have been obtained for the main structures observed in the spectra. Comparison with DWBA correlation functions permits a 2+ assignment for all the groups in the 20–30MeV excitation range. The percentage of theE2-EWSR exhausted in the same range is in agreement, within the uncertainties indicated, with that derived from the inelastic scattering of other particles. 相似文献
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D.D Markushev J Jovanovic-Kurepa 《Journal of Quantitative Spectroscopy & Radiative Transfer》2003,76(1):85-99
A detailed analysis of the total average number of absorbed photons 〈n〉total during Infrared multiphoton absorption processes in mixtures of SF6-Ar, N2 and CH4 buffer gases is presented. The results for 〈n〉total are deduced using pulsed photoacoustic technique in collisional regime. Complete analysis is based on the theoretical generalized coupled two-level model (GCT) and its application to different gas mixtures. Evaluation of partial 〈n〉coll. values is presented too, obtained using the results from time-resolved optoacoustic (TROA) and time-resolved absorption (TRA) methods for V-T relaxation times (τV-T) and the saturable absorber (SA) method for R,R-T relaxation times (τrot.-rel.), and applying them directly to the GCT model. All methods (TROA and SA) and the GCT model use the same photoacoustic results from our experiment under identical experimental conditions. 相似文献
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利用不同波长和光强的纳秒激光,对Kr原子团簇进行了激光电离的飞行时间质谱研究,观察到Kr高价离子价态显著地依赖于激光波长,当分别用波长为1064,532,355和266 nm的激光照射Kr原子团簇时,可分辨的离子最高价态分别为+17,+11,+4和+2价;然而离子价态与激光功率密度的依赖关系并不明显。实验结果支持多光子电离-逆轫致吸收加热-电子碰撞电离三步电离模型,表明电子碰撞电离是高价离子产生的主要途径。 相似文献
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