CONTENTS 



Part L— Infra-red Absorption Spectra. 



Page 



Chapter I. — Introduction 3-4 



Chapter II.— Historical 5-8 



Other investigations °"^ ^ 



Solvents ^ ^ " ^2 



Ultra-violet 12-13 



Total absorption temperature, etc i3-i5 



Chapter III.— Description of apparatus and methods 15-33 



The spectrometers ^" 



The prisms used '..... 16-17 



Adjustment and calibration of apparatus i7 



Adjustment of large spectrometer 18-21 



The radiometer 21-23 



The absorption cells 23-25 



Source of radiation 25-26 



Methods of observation 26-27 



(Sources of error 27-29 



The chemicals used 29-30 



Problems attacked 30-3i 



Chapter IV.— Investigation with a quartz prism 33-38 



Chapter V.— Investigation vi^ith a rock-salt prism 39-ioi 



Class I— Methane derivatives. Absorption spectra of gases 39-54 



The absorption cell 41-43 



Gases studied 43-54 



Absorption spectra of liquids and solids 54-99 



Halogen substitution products 54-50 



Water and alcohol 56-59 



Compounds containing the methyl group 59-65 



Compounds containing sulphur 65-67 



The mustard oils and sulphocyanates 67-69 



The fatty acids 69-72 



Petroleum distillates 72-77 



Methylene series 73 



Paraffin series 73 



Acetylene series 73 



Class II — Carbocyclic compounds 76-99 



Benzene 76-77 



Methyl derivatives of benzene 77-8o 



Various other benzene derivatives 80-83 



Amido and nitro derivatives of benzene 84-86 



Nitro derivatives 86-87 



Phenols 87-89 



Aromatic acids 89-90 



III 



t f n 



