Journal of the Spectroscopical Society of Japan

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A Shimadzu-type plasma jet arc unit equipped with a ceramic nozzle was employed in this study.Various parameters of the plasma jet arc were quantitatively studied, their interrelations were clarified, and criteria for the optimum conditions were establshed.
Distance of the analytical gap, position of the cathode, flow rate of helium, plasma flow, arc resistance operating current and voltage, sample size, spatial distribution of the ratio of line intensity to back-ground in the analytical gap, and influence of extraneous elements on the spectral intensity of the aimed elements were investigated.As a result, the simultaneous determination of consituent elements in various metals and alloys has been proved to be possible by the use of a plasma jet arc without any matrix effect.Single, widely applicable calibration curves for nickel, manganese and chromium were obtained by the use of acidic solutions of the standard samples.The plasma jet arc unit described here can be utilitized as a practical device durable for long runs.

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Low pass filters used in the infrared region are fabricated, and their transmission characteristics and their temperature dependencies are described.
The low pass filters are essentially Ge-filters with multilayer-interference antireflecting coatings, PbTe and ZnS being used as the high and the low index material, respectively.The average percent trans-mittance of filters is 0.01-0.1% in the rejection region, and 60-80% in the transparent region.
The influence of thickness of the antireflecting layer on the number and the amplitude of the oscilla-tion in the pass band region is discussed.
The cut-on wavelength shifts 0.12 it to longer wavelength and the transmittance in the rejection region decreases as the filter temperature is decreased to 78°K.

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