The photodissociation spectrum of jet-cooled PtO+ is reported over the range of 25 000 to 30 000 cm(-1). Excited state vibrational progressions are identified for (4)Pi(-1/2) <-- (4)Sigma(3/2) and (4)Pi(5/2) <-- (4)Sigma(3/2) transitions with several vibrational peaks rotationally resolved. Additional peaks not assigned to a vibrational series also exhibit rotational structure. Transitions arising from the (4)Sigma(3/2) ground state show a spectroscopic onset of 25 520 cm(-1), giving an upper limit to the bond strength of D-0(Pt+ -O) less than or equal to 305 kJ mol(-1). A hot band is observed at 25 317 cm(-1) and rotational analysis predicts it as arising from a low-lying Omega = 7/2 state, probably (4)Delta(7/2). (C) 2003 Elsevier B.V. All rights reserved.