抄録
The near infra-red absorption spectrum of sulphuric acid at various concentrations and temperatures together with some preliminary accounts for nitric acid are presented in this paper. In the case of sulphuric acid at room temperature a broad band with a maximum at 1•8μ is observed. It is attributed to the vibration characteristic of the motion of hydrogen against oxygen in the acid OH group. A similar band is observed in aeid solutions. When temperature is increased the band at 1•81μ is weakened in its intensity and a new band at 1•5μ which is in the overtone region characteristic of the OH radical appears increasing its intensity with temperature. For fuming sulphuric acid and fuming nitric acid at room temperature the characteristic OH absorption hands lie at 1•51μ and 1•55μ respectively. From these facts the structure of these acids and their solutions together with the nature of the hydrogen bond are discussed