“…Recently, Beutel et al [7] measured the 0-0 and 1-1 bands of the a 1 D-X 3 R À transitions of SbH and SbD with a Fourier transform spectrometer. Shestakov et al [8] studied the b 1 R + -X 3 R À transitions of SbH and SbD by pulsed laser excitation spectroscopy. The spectra of Shestakov et al [8] directly measured the large spin splitting of about 660 cm À1 between the X 1 0 + and X 2 1 spin components of the X 3 R À state.…”