Transmittance of thin films in the extreme ultraviolet
Transmittance of thin films in the extreme ultraviolet
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薄膜在极紫外光下的透过率
DOI：
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发表时间：
1964
期刊：
影响因子：
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通讯作者：
R. Tousey
中科院分区：
文献类型：
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作者：
W. Hunter;R. Tousey
测量了无背衬薄膜的极紫外光透过率，其波长范围延伸到150？介绍了用铝来消除火箭太阳光谱中的杂散光的方法，并给出了300？附近波长的太阳光谱和光谱日光图。《体育杂志》第25期，1964年简维尔-费维尔出版，导言。在极端紫外线研究中，薄膜非常有用，原因有几个。首先，它们可以用作窗口，传输辐射，但阻挡气体，例如，将充满气体的探测器与真空系统隔离；第二，它们的选择性传输特性使其可用作滤光器，以消除杂散光或进行订单分类。许多年前，Laird[1，6]展示了薄膜形式的赛璐璐可以传输到短至450A的波长，也可以在软X射线范围内传输。后来，O‘Bryan[2]在1000-300A范围内定量测量了赛璐璐的透过率，Tomboulian和Bedo[3]在260-80A范围内测量了Zapon的透过率。Wood[4]在1933年发现碱金属可以传输紫外线而不能发射可见光，这为将金属薄膜用作滤光器的研究提供了动力。然而，由于它们的化学活性，碱金属只有在石英板之间以夹层方式密封时才能使用，就像0‘Bryan[5]所做的那样。当然，石英将它们的使用限制在超过1550埃的波长范围内，金和银的传输波长范围有限，金的传输波长为5000安，银的传输波长为近3 200埃。虽然Laird[6]报道了银可以传输短至900A的波长，但到目前为止，还没有人利用它在真空紫外线中的传输特性。第一个关于无背衬金属薄膜在极端紫外线下透过率的定量工作是由TomBoulian和Pell[7]完成的，他们测量了80到320 A的波长范围内的铝，并由Astoin和Vodar[8]对部分由美国国家航空航天局支持的胶棉上的铝进行了测量。波长范围从750到130A。这一光谱区域包括L1和L2，3 X射线边缘，其中只有L2，3 X射线边缘被清楚地观察到。最近，Walker、Rustgi和Weissler[9]测量了一些金属薄膜在极端紫外线下的透过率。Hunter[10]已经确定了铝和铟在大部分光谱范围内的消光系数和折射率，从而为计算给定厚度的薄膜的透过率提供了信息，包括所有的干涉效应。本文将给出铝、铟和抛物线薄膜的透过率测量结果，以及它们作为滤光片在极紫外光中的可能应用。
The extreme ultraviolet transmittance of thin unbacked films of parlodion, aluminium, and indium was measured over the wavelength range extending to 150 Å. The use of aluminum for eliminating stray light in solar spectroscopy from rockets is illustrated with solar spectra and spectroheliograms made at wavelengths near 300 Å. LE JOURNAL DE PHYSIQUE TOME 25, JANVIER-FÉVRIER 1964, Introduction. In extreme ultraviolet research, thin films are very useful for several reasons. First, they may be used as windows, transmitting the radiation but holding back a gas, for example, to isolate gas-filled detectors from the vacuum system ; second, their selective transmission properties make them useful as optical filters for eliminating stray light or for order-sorting. Many years ago celluloid in the form of a thin film was shown by Laird [1, 6] to transmit to wavelengths as short as 450 A, and also in the soft x-ray range. Later, quantitative measurements of the transmittance of celluloid in the range 1000 to 300 A were made by O’Bryan [2], and Tomboulian and Bedo [3] measured the transmittance of zapon from 260 A to 80 A. The discovery by Wood [4] in 1933 that the alkali metals transmit ultraviolet but no visible radiation, supplied the impetus for investigations concerning the use of thin metal films as optical filters. Because of their chemical activity, however,the alkali metals can only be used if sealed, in sandwich fashion, between quartz plates, as has been accomplished by 0’Bryan [5]. The quartz, of course, restricts their use to wavelengths longer than about 1550 A. Gold and silver have long been known to transmit in restricted wavelength ranges, gold at 5 000 A and silver in a narrow band near 3 200 Å. Although silver was reported by Laird [6] to transmit wavelengths as short as 900 A, no use has been made of its transmitting properties in the vacuum ultraviolet as yet. The first quantitative work on the transmittance of thin unbacked metal films in the extreme ultraviolet was done by Tomboulian and Pell [7], who measured aluminum over the wavelength range 80 to 320 A, and by Astoin and Vodar [8] for aluminum supported on collodion over the (1) Supported, in part, by the National Aeronautics and Space Administration. wavelength range 750 to 130 A. This spectral region includes the L1 and L2,3 x-ray edges, of which only the latter were clearly observed. More recently, Walker, Rustgi, and Weissler [9] have measured the transmittance of a number of thin metal films in the extreme ultraviolet. Hunter [10] has determined the extinction coefficient and index of refraction for aluminum and indium over most of the spectral range where they are transparent, thus providing information from which to calculate the transmittance of films of a given thickness, including all the interference effects. In the present paper, the results of transmittance measurements for aluminum, indium, and parlodion films will be presented, and their possible use as filters in the extreme ultraviolet will