Multiphoton dissociation of GeH4: ultraviolet emission spectrum of GeH

The ultraviolet emission spectrum of GeH has been examined following the two photon-initiated dissociation of germane (GeH4) at 248 nm. The most prominent peaks lying between ∼250 and 340 nm are tentatively assigned to B 2Σ(v′=0)→X 2Π1/2,3/2 (v′) transitions. From this premise, the vibrational constants for the X 2Π states have been estimated to be ωe=(1949±5) cm−1, ωexe=16.5±2.0 cm−1, and ωeye=(0.7±0.3) cm−1. Also, the radiative lifetime of the lowest vibrational levels of the GeH A 2Δ state in transitions to ground has been measured to be 12±2 ns.