WE experimented with the absorption spectrum of gaseous mercuric sulphide. The substance was introduced into a quartz absoiption tube which could be heated to about 400° C. by electrical means, steps ...
THE absorption spectrum of benzoquinone in the vapour state between 0° C. and 100° C. in cells 5–100 cm. long has been photographed with a three-prism Steinheil glass spectrograph and a Hilger E 492 ...
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