The advanced adiabatic approach (AAA) previously proposed for the desc
ription of collision problems in atomic physics is extended to the spe
cific case of mesic atom collisions in excited states n greater than o
r equal to 2. Calculations of the muon transfer and Coulomb deexcitati
on rates in collisions of (p mu)(n), (d mu)(n), and (t mu)(n) muonic a
toms in excited states n=3,4,5 with hydrogen isotopes p,d,t are presen
ted. (C) 1998 American Institute of Physics.