State-specific low temperature reactions of DBr+2Πi(v+)+(D2,DBr)→D2Br+

State-specific reactions of DBr+(2Πi,v+) with D2 and DBr were studied in a low temperature free jet flow reactor. The selected spin–orbit and vibrational states of the DBr+ ion were prepared by resonance-enhanced multiphoton ionization. All of the reactant and product ions were monitored using time-of-flight mass spectrometry. Rate coefficients for the DBr+/DBr reaction are ∼1.4×10−9 cm3 s−1 independent of the ion internal state, similar to those for the HBr+/HBr reaction. Rate coefficients of the DBr+/D2 reaction rise from 0 (lower spin–orbit-vibrational states) to 2×10−11 cm3 s−1 (highest energy states) and are observed to follow a mass independent threshold function similar to the HBr+/H2 reaction.