Spectroscopy of hafnium monohalides

The modern intracavity laser method has been applied to study electronic sp ectra of the hafnium monohalides molecules. Results of new investigation of HfF and HfBr molecules are presented: the bands at 589.3, 590.6, and 593.1 nm observed in intracavity laser spectra of HfF, have been assigned to the bands of HfF or ionized HfF; new molecular constants of the HfBr molecule have been obtained. Spectroscopic studies of HfCl and Hfl molecules are dis cussed, and the most reliable molecular constants of HfCl, HfBr, and HfI mo lecules are recommended.