Supplementary Investigations of Infra-Red Spectra: Part V, Infra-Red Reflection Spectra; Part Vi, Infra-Red Transmission Spectra; Part VII, Infra-Red Emission Spectra (Classic Reprint) - Softcover

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Excerpt from Supplementary Investigations of Infra-Red Spectra: Part V, Infra-Red Reflection Spectra; Part Vi, Infra-Red Transmission Spectra; Part VII, Infra-Red Emission Spectra

The Spectrometer slits were mm., or about 2' of arc, as in the preceding work. The radiation from a Nernst heater was projected upon the reflecting surfaces by means of a mirror having a focal length of 15 cm. And an aperture Of 12 cm.

The reflection spectrum was explored by means of a Rubens thermo pile. Although its sensitiveness was greater than the radiometer used previously, the unsteadiness at times, due to magnetic disturbances, neces sitated repeating the Observations at each spectrometer setting. When using the radiometer, it was rarely necessary to repeat the Observations in exploring the spectrum up to 9 or IO p, while in the present work, using a thermopile, the region beyond 9 I: was examined under the greatest difficulties, and in the case of the carbonates no attempt was made to locate the band at 1 p. When the reflection faces were less than the standard size, 2 by 3 cm. Which was frequently the case, the silver com parison mirror and the specimen were covered with diaphragms having equal openings, so that equal areas of the two surfaces were exposed.

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