945 
The same conclusion is reached for oxygen and nitrogen, the 
quadrupole moments of which have been calculated inthe preceding 
paper (Comm. n°. 6a) with neglect of the induced attraction: 
OBB 1152010, ‘Comm. N° 6a: 3,55. < 10-28 
NE: PRO oe de 
The conclusion that the quadrupole attraction for these gases 
exceeds the induced attraction is confirmed when in the calculation 
of the second virial coefficient the induced attraction is also attended 
to. This has been done in ó 3. 
6 3. The second virial coefficient for spherical polarisable quadru- 
pole molecules. We suppose the state of polarisation of the molecules 
(displacements of the electrons from their positions or paths of 
equilibrium) to be at each moment in correspondence with the field 
that surrounds the molecule at that moment. Further the molecule 
to be isotropically polarisable, so that the induced bipole moment 
has the direction of the electric field # and is equal to 
Wes dee Amert ee eee! rei GL) 
The index 1 indicates he that we have to do with a bipole 
moment, while both here and further on quantities with the index 
2 are due to the electrostatic induction. 
The energy of the induced bipole in the field H (compare Desir 
Keje: 
lm 9 
ne ke 
When the induced bipole is placed at a point P of the field of 
a zonal quadrupole A with quadrupole moment u, (Fig. 1), in such 
a way that PA makes the angle 6 with the axis of the quadru- 
pole, we find for the energy of the induced bipole 
9 au,’ 
2 x ae 
The calculation of the second virial coefficient may be analogous 
to that of Leiden Suppl. N°. 39a $2. A pair of molecules that may 
sint 0 + 4cos* 6}. . . (3) 
1 
add 
=d 
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