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首页> 外文会议>Conference Series no.182; International Symposium on the Science and Technology of Light Sources; 20040718-22; Toulouse(FR) >Radial Profiles of Vibrational Temperatures in Deuterium Lamps Analysing the Dissociation Continuum
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Radial Profiles of Vibrational Temperatures in Deuterium Lamps Analysing the Dissociation Continuum

机译：氘灯中振动温度的径向分布分析解离连续体

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摘要

Capillary-arc spectral lamps using the emission of hydrogen or deuterium dissociation continua are known to be widely used in spectroscopy and analytical instrumentation as rather convenient sources of UV and VUV continuum radiation. Nowadays such lamps are characterized by aperture diameters of typically 0.5mm, whereas the shape of the central plate carrying the aperture could differ distinctly. Analyzing the intensity distribution of the dissociation continua we found that their radial profiles exhibit structures in the wings, e.g. in the subset of figurel. The amplitude and shape of these symmetrical features depend on the type of the aperture built-in inside the lamp. The dissociation continuum of hydrogen molecules and their isotopes can be used not only to estimate the total dissociation rate, it is also possible to characterize via the relative intensity distribution the vibrational population distribution of the ground state [1]. This method was applied to the continuum emission of deuterium measured at several radial positions in different deuterium lamp types and for different anode currents. As a result, also the vibrational temperature exhibits a radial distribution indicating locally varying excitation conditions for the molecules. Because the latter depend also on the electron density and their velocity distribution, the result is interpreted as a link to space charge constellations in front of the cup structure. This indicates a possible explanation of the radially structured emission profiles.
机译：已知使用氢或氘解离连续体发射的毛细管电弧光谱灯作为紫外线和VUV连续体辐射的相当方便的来源已广泛用于光谱学和分析仪器中。如今，这种灯的特征是孔径通常为0.5mm，而带有孔径的中央板的形状可能会明显不同。分析解离连续体的强度分布，我们发现它们的径向轮廓在机翼中显示出结构，例如在Figurel的子集中。这些对称特征的幅度和形状取决于灯内部内置孔的类型。氢分子及其同位素的解离连续体不仅可以用来估计总解离速率，还可以通过相对强度分布来表征基态的振动种群分布[1]。该方法适用于在不同氘灯类型和不同阳极电流的几个径向位置处测量的氘的连续发射。结果，振动温度也表现出径向分布，这表明分子的激发条件局部变化。由于后者还取决于电子密度及其速度分布，因此将结果解释为与杯状结构前面的空间电荷群的联系。这表明对放射状结构的发射轮廓的可能解释。

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