The group-theoretical classification of all possible quadrupole arrangements which was carried out in a previous paper for crystals such as H2 and N2 is extended here to include CO, the molecules of which lack a center of symmetry. It turns out that the quadrupole arrangement in the cubic phase is T4 with axially symmetric quadrupoles. From symmetry considerations of the quadrupoles only, it is shown that a structure similar to the tetragonal D4h14 arrangement in γ nitrogen cannot be formed in solid CO, in accord with recent experimental results.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics