CCL: Exchange correlation

 Sent to CCL by: David A Case [case()]
 > > Dear all, when is it suitable to start considering Exchange
 > > correlation between Electrons, (e.g pass Oxygen, Mg, Phosporous or
 > > further up in the system)?
 On Thu, Jun 12, 2014, Robert Molt wrote:
 > Always
 Well, the hydrogen atom might be a notable exception here.  :-)
 ...dave case