Open AccessThe less refrangible spectrum of cyanogen, and its occurrence in the carbon arc
Author(s) -
Allan Fowler
Publication year - 1912
Publication title -
proceedings of the royal society of london. series a, containing papers of a mathematical and physical character
Language(s) - English
Resource type - Journals
eISSN - 2053-9150
pISSN - 0950-1207
DOI - 10.1098/rspa.1912.0006
Subject(s) - cyanogen , spectrograph , spectral line , spectrum (functional analysis) , carbon fibers , astrophysics , millimeter , dispersion (optics) , physics , materials science , optics , chemistry , astronomy , organic chemistry , quantum mechanics , composite number , composite material
In connection with Prof. Strutt's investigations of the interaction between the active modification of nitrogen and certain compounds of carbon, it became necessary to compare the resulting spectra with the spectrum given by cyanogen under the more usual conditions of experiment. It was then discovered that while precise measurements of the well known bands in the violet and ultra-violet had been made by Kayser and Runge, only roughly approximate positions had been tabulated for the bands, degraded in the opposite direction, which appear in the less refrangible parts of the spectrum. In view of the interest of these bands, arising from their possible occurrence in association with the violet bands in certain celestial bodies, as well as from the regularity of their structure, a new series of measurements has been undertaken. The spectrograph chiefly employed for the determination of positions was one of the Littrow type, giving a linear dispersion of 57 tenth-metres per millimetre at 6700, and 16·5 tenth-metres per millimetre at 4700, the length of spectrum between these points being 6·7 cm. A quartz spectrograph giving 2 cm. for the same range of spectrum was also utilised for ready comparison of the spectra obtained from different sources.