THE EMISSION-SPECTRUM OF HELIUM HYDRIDE .4. BANDS NEAR 4100-A AND 4600-A

The emission bands of helium hydride near 4100 and 4600 Å were analyzed for 4HeH and 3HeD. They are assigned to the emission of the three coupled states 4p 2Π, 4d 2Π, and 4d 2Δ to the A 2Σ+ (4100 Å) and B 2Π (4600 Å) states. These bands are analogous to the emission of n=3 states near 5300 and 6000 Å analyzed previously. Only the A″ parity components of n=A states were observed, the states of A′ parity decay predominantly by predissociation. Several weak lines around 4100 Å were assigned to the transition 5d→B 2Π. © 1990 American Institute of Physics.