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Spectral Differentiation of Pure Hydrocarbons: A Near Infrared Absorption Study (Classic Reprint): A Near Infrared Absorption Study (Classic Reprint)

Spectral Differentiation of Pure Hydrocarbons: A Near Infrared Absorption Study (Classic Reprint): A Near Infrared Absorption Study (Classic Reprint)

          
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About the Book

Excerpt from Spectral Differentiation of Pure Hydrocarbons: A Near Infrared Absorption Study

The spectrograph, of the Littrow form, is shown in figure 1. The source of continuous radiation is a tungsten ribbon - filament lamp which is enclosed in a water-jacketed cell. The light is collimated through a large brass tube 1 m long, and focused by a concave mirror on the slit of the spectograph. The absorption cell containing the solution or compound under investigation is fixed in the light path between the collimating tube and the slit. The light then goes to a large concave mirror from which parallel rays are reflected through two 60 glass prisms, then reflected by the plane Littrow mirror over the same path, giving four-prism dispersion, and finally focused on a sensitive vacuum thermocouple. Wave length variation is accom plished by rotation of the Littrow mirror which is coupled with the motion of a recording photographic plate by means of a lever system. As the incident energy on the thermocouple actuates the galvanome ter, a beam of light reflected from the galvanometer mirror moves across the photographic plate, so that one has recorded a graph of galvanometer deflections with wave lengths, or a plot in arbitrary units of the intensity of transmitted light against frequency. As a check on the constancy of the intensity of emission of the tungsten filament, the cell was withdrawn from the light path by means of a solenoid arrangement moving the cell-holder along a dove-tail slide, thus producing on the recorded photographic plate segments of the curve of the emission of the so'urce not modified by the absorption cell. Likewise, to determine the zero drift of the galvanometer, a shutter was thrown in front of the slit at certain times giving segments of the base line of the curve. The motion of these two auxiliary units was controlled by a breaker circuit operated by a synchronous motor; the motion of the photographic plate was controlled also by a synchronous motor, hence these segments of curves always appeared at the same frequency on the recorded plate, and it was thereby pos sible to compare the intensity of emission of the source during the recording of one plate with that of another. Thus by recording the transmission of the cell filled with carbon tetrachloride, then the cell containing the solution, it was possible to calculate the transmittancy from which the absorptive indices were derived.

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Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com

This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.


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Product Details
  • ISBN-13: 9780331399301
  • Publisher: Forgotten Books
  • Publisher Imprint: Forgotten Books
  • Language: English
  • ISBN-10: 033139930X
  • Publisher Date: 03 Feb 2019
  • Binding: Hardback


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