On The Magnetic Susceptibilities of Vapors of Organic Liquids

The apparatus employed in this investigation consists essentially of a thin closed diamagnetic bulb suspended from one end of the beam of a modified Curie balance. The vapor under investigation surrounds this bulb. The complete balance is in an airtight chamber of suitable shape. The bulb moves horizontally and at right angles to a non-homogeneous field, causing a twist in the suspension fibre of the balance beam. The diamagnetism of the bulb is compensated as nearly as possible by enclosing the requisite quantity of air, so that at room temperature there is very little magnetic force acting on it, if surrounded by a vacuum. Now if a diamagnetic vapor is introduced, the bulb apparently becomes paramagnetic and is drawn towards the stronger part of the field, and vice versa if a paramagnetic vapor be introduced. Values relative to air were obtained in all cases. All the vapors examined were diamagnetic. The molecular susceptibilities determined for the vapor state were in many cases nearly equal to those calculated from the liquid state, but in some cases they appear to be higher. This is specially true in the case of C${\mathrm{S}}_2$ and ${\mathrm{C}}_6$ ${\mathrm{H}}_6$, the molecules of which are known to possess a high degree of magnetic ${\mathrm{anisotropy}}^1$ in the liquid state. The results for these two substances await confirmation by independent investigations by other methods.