共查询到20条相似文献,搜索用时 625 毫秒
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用1米掠入射光栅谱仪测量了在点聚焦和线聚焦两种打靶方式下,单脉冲或双脉冲驱动锗薄膜产生的等离子体XUV光谱。并对测得结果进行了分析讨论。在点聚焦打靶条件下,等离子体发射的XUV光谱主要为底衬材料发射的谱线,集中在小于19um的波长范围内。在靶长10mm线聚焦打靶条件下,Ge等离子体谱线增多,出现了GeXXⅢ3s─3pJ=0-1和J=2-1两条激光线。C离子的Hα线显著变强。 相似文献
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基于邻苯二甲酸氢铊(TAP)弯晶和软X射线分幅相机建立了一套4通道的时空分辨弯晶摄谱仪,测谱范围1 500~2 300 eV,时间分辨约2 ns。分析了谱仪各环节的信号传递和转换过程对系统谱响应的影响。利用该谱仪在“强光一号”加速器(约1.5 MA, 80~100 ns)Al丝阵Z箍缩实验中获得了时间分辨及时间积分的Al等离子体K层辐射谱,记录到了类H、类He离子主要共振线及类Li、类He离子双电子复合伴线。将摄谱结果与分能区X射线图像进行了比较。时间分辨的发射谱相对强度与积分结果有明显不同,反映了等离子体在5~10 ns时间尺度上的电子温度和离子布居变化。 相似文献
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激光等离子体谱线线型研究与谱线强度测量 总被引:1,自引:0,他引:1
在对激光等离子体中不同区域发射的X光光谱谱线的加宽机制(如Doppler展宽、Stark展宽等)及谱线线型研究的基础上,构造了不同的线型拟合函数。通过和实验谱线的数据拟合,可以精确测量等离子体发射的X射线光谱强度。和截断法相比,该方法的优点是可以方便地根据谱线的不同展宽机制将相应的线谱和背景连续谱以及邻近的线谱分开,从而达到精确测量线光谱强度的目的。该方法不但能够应用于激光等离子体发射的光谱,也可用于其它波段的线谱强度的精确测量。 相似文献
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The XUV spectra emitted by plasma produced by focusing a ruby laser on plane targets of carbon and beryllium have been observed with a novel stigmatic spectrograph fitted with a toroidal mirror. The observations have been made both side-on on the expanding plasma and end-on looking inside the crater. In the latter case the intensity emitted is very large and the lines broadened indication electron densities approacing the critical density at 2.2×1021 cm-3. The relative intensity of resonance lines, free-bound and free-free continua and He-like and Li-like satellites has been determined. In particular the latter satellites appear to arise only from the region inside the crater. 相似文献
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H.W. Drawin 《Journal of Quantitative Spectroscopy & Radiative Transfer》1982,27(6):627-638
Satellite lines produced by longitudinal electrostatic plasma waves in the presence of a non-coherent and unpolarized radiation field are investigated by perturbation theory expanded to fourth order. The results show that the Baranger and Mozer plasma satellites are shifted even in the zero radiation field limit, and that their strength can be enhanced by the radiation field. 相似文献
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Yu. É. Borozdin E. D. Kazakov V. I. Luchin N. N. Salashchenko I. Yu. Tolstikhina V. V. Chernov N. I. Chkhalo A. P. Shevel’ko O. F. Yakushev 《JETP Letters》2008,87(1):27-29
The spectra of a laser plasma in the soft x-ray (0.8–0.95 nm) and vacuum ultraviolet (3–4 nm) ranges are recorded with the use of new focusing multilayer structures. It is demonstrated that the electron temperature of the light-element plasma produced by a laser pulse with an energy of ~1 mJ can be measured by using the relative intensities of the satellites and the lines of ions with different charges. 相似文献
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Simple models for wentzel-druyvesteyn satellite energies in soft X-ray emission spectra of molecules
Jan-Erik Rubensson Hans Åcren Rolf Manne 《Journal of Electron Spectroscopy and Related Phenomena》1985,36(4):307-317
Simple models for the energy displacement between Wentzel-Druyvesteyn satellites and main lines in soft X-ray emission spectra of molecules are presented. The models include effective hole-hole interaction parameters and are evaluated numerically for H2O. 相似文献
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本文报道在LF12激光装置线聚焦打靶情况下,利用MgⅪ共振线和互组合线的强度比推得的激光等离子体电子密度的空间分布轮廓。将此结果和点聚焦打靶得到的结果比较发现二者区别不大。本文还讨论了电子复合伴线、光厚等因素对电子密度测量的影响。 相似文献
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I. Yu. Skobelev A. Ya. Faenov T. A. Pikuz A. I. Magunov F. Flora S. Bollanti P. DiLazzaro D. Murra A. Reale L. Reale G. Tomassetti A. Ritucci G. Petrocelli S. Martellucci N. Lisi F. B. Rosmej 《Journal of Experimental and Theoretical Physics》2002,95(3):421-428
Satellite lines caused by radiative transitions from the Rydberg autoionization states of a Li-like Mg X ion in a plasma heated by radiation from a XeCl and a Nd laser are identified for the first time, and their wavelengths are measured precisely. Comparison of the experimental data with the atomic structures calculated by the method of relativistic perturbation theory shows that the accuracy of calculations of the energy of autoionization states is rather high even without the use of any semiempirical corrections and is of the order of 0.06%. The experimentally measured wavelengths can be used for a semiempirical estimate of the value of the leading order of perturbation theory among the orders that were neglected in calculations. It is shown that the simulation of the population kinetics of Rydberg autoionization states of Li-like ions in a dense plasma should take into account all possible channels of dielectronic capture, in particular, from the excited states of a He-like ion. The precision experimental wavelengths obtained for satellites of the Heß and Heγ lines of the Mg XI ion make possible to use these satellites as reference lines in studies of complicated spectra of multielectron ions. 相似文献
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We have measured the spectrum of plasma emission in the Frascati tokamak FT around the resonance line 1s2p → 1s2 of the helium-like ion Cr XXIII. The presence of dielectronic satellites has been detected and their wavelengths determined. The intensity ratio of these satellites to the resonance line has been calculated from the corresponding lines in Fe XXV with a simple extrapolation. Good agreement with experimental points has been obtained in high electron density discharges. Line ratios systematically lower than the predicted values are obtained at low density and this has been related to the presence of a non-thermal population of electrons as indicated also by other diagnostics. 相似文献
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N.F. Allard Y.G. Biraud 《Journal of Quantitative Spectroscopy & Radiative Transfer》1980,23(3):253-266
We have studied the profiles of spectral lines of alkalies perturbed by rare gases using the Anderson and Talman theory of line broadening with a square-well potential, chosen for its simplicity in order to understand the influence of potential parameters on the profiles. Although it is obvious that such a simple potential is not able to give an exact quantitative fit to the experimentally measured results, we have been able to give a complete and satisfactory explanation of the variations of width, shift and asymmetry with density by applying previously established results, for the case of well-resolved satellites, to the case of unresolved satellites often encountered experimentally. 相似文献
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H. Röhr 《Zeitschrift für Physik A Hadrons and Nuclei》1968,209(3):295-310
In a 90° scattering experiment performed on a plasma with a density of some 1017cm?3 and a temperature of some eV a scattering spectrum is expected which consists essentially of an intense central part and two very weak satellite peaks. In this investigation the spectrum of the central part (ion line) was resolved. From the ion line alone which was in good agreement with calculated spectra, the ion temperature, electron temperature and electron density were determined. At some plasma parameters only a few particles were included in the Debye volume. Also in these cases no deviations from calculated spectra have been observed. In addition the position and half-width of the satellites were measured. The position of the satellites yields an independent value of the electron density which agrees very well with that determined from the ion line. The half-width of the satellites was much broader than expected theoretically due to fluctuations of the electron density within the scattering volume. The measurement was performed on a theta pinch plasma. The energy of the condensor bank was 7.5 kJ, the voltage 18 kV. As a light source aQ-switch laser was used with a power of about 100 MW. Because of beam stops to prevent stray light only a fourth of the whole power reached the plasma. 相似文献