LIF Study of the b1Σ+(b0+) ↔ X3Σ−(X10+,X21) Transitions of SbH and SbD

Abstract The b 1 Σ + (b0 + ) ↔ X 3 Σ − (X 1 0 + ,X 2 1) transitions of SbH and SbD have been studied by laser-induced fluorescence measurements. Ground state SbH(SbD) radicals were generated in a fast-flow system by reaction of microwave-discharged hydrogen (deuterium) with antimony vapor. Vibrational levels v = 0 and 1 of the b 1 Σ + state were excited with a pulsed dye laser. In addition to five electric dipole branches S R, Q P, Q R, Q Q, and O P, weak magnetic dipole branches P Q were observed in the 0–0 bands of the b 1 Σ + ← X 3 Σ − transitions. Rotational and vibrational constants of the X 3 Σ − and b 1 Σ + states were deduced from high-resolution excitation spectra. Time-resolved measurements of the fluorescence decay and measurements of relative line and band intensities allowed determination of the radiative lifetime of the b 1 Σ + state of SbH (τ = 173 ± 3 μs) and of the electric and magnetic dipole transition moments μ 0 = ±0.036 D, μ 1 = ∓0.058 D, | M | = 1.62 Bohr magnetons.