Knowledge Bank

The emission spectra of ScH and ScD have been investigated at high resolution in the $3000-14500cm-1$ region. The molecules were excited in a scandium hollow cathode lamp by discharging a mixture of He and $H2$ or $D2$, and the spectra were recorded using a Fourier transform spectrometer. The new bands of ScH and ScD with high wavenumber R heads near $11620cm-1$ and $11630cm-1$, respectively, have been assigned as the $0-0$ bands of the $\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}\Phi -a3\Delta$ transition. The rotational structure of each sub-band consists of only the R and Q branches. A rotational analysis of these bands have been obtained and the spectroscopic constants have been extracted. This transition is analogous to the $\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}\Phi -a3\Delta$ transition of YH [Ram and Bernath, J. Chem. Phys., 101, 9283 (1994)] and LaH [Ram and Bernath, J. Chem. Phys., 104, 6444 (1996)].