The phenol-(NH3)(n=1,2,3) (S-1) lifetimes have been measured near their ban
d origins by a picosecond pump/probe scheme. The very short lifetimes obser
ved reveal that the excited clusters undergo a reactive process, namely the
following dissociative hydrogen transfer reaction: PhOH*-(NH3)(n) --> PhO.
+ NH4(NH3)(n-1).