CCL: basis set to calculate proton affinity

 Sent to CCL by: Goedele Roos [groos[]]
 dear all,
 I was wondering which basis set in combination with the B3LYP functional will
 give the protonaffinity up to 1% accuracy?
 Thank you in advance for help.
 Drs. Goedele Roos
 Dienst Algemene Chemie (ALGC)
 Vrije Universiteit Brussel (VUB)
 Pleinlaan 2
 B-1050 Brussels
 Tel: 0032-2-629 35 16
 Fax: 0032-2-629 33 17