CCL: Scaling frequency in PCM

From: Marcin Krol <mykrol\a/cyf-kr.edu.pl>
Subject: CCL: Scaling frequency in PCM
Date: Mon, 20 Mar 2006 18:30:12 +0100 (MET)

 Sent to CCL by: Marcin Krol [mykrol||cyf-kr.edu.pl]
 Dear All,
 I am running frequency calculations in CPCM/HF/6-31+G(d) and I wonder what
 the scaling factor could be. I probably cannot use 0.9163 advised for
 vacuum HF/6-31+G(d) calculations. Is it then better not to use the
 sacling factor at all? What I
 want from freq calculations is ZPE to get free energies of different
 tautomers of the same molecule in water. Since I am interested in relative
 stabilities of tautomers and scaling factor is probably not so important
 (ZPEs will be pretty the same anyway). Or am I wrong?
 Thank you in advance for your suggestions
 Best regards
 marcin