Absorption electronic spectra of MOO and WO molecules have been investigated by a intracavity laser technique in the region 550-800 nm. New features have been discovered.As for MOO molecule the rotational analysis of the four bands have been carried out for the first time. Two of these bands were referred to 0-0 transitions arisen from the new (probable triplet) low-lying electronic state, two other bands were referred to transitions arisen from excited components of X517 ground state.As for WO molecule the rotational analysis of 0-0 and 1-0 bands represented A-X and B-X systems have been carried out for the first time. The new band has been discovered which has been referred to new electronic transition.Molecular constants of new states of both molecules studied have been evaluated.

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Absorption spectrum of NbN has been o b t a i n e d i n t h e 560-670 nm r e g i o n by i n t r a c a v i t y l a s e r spectroscopy.V i b r a t i o n a l and r o t a t i o n a l a n a l y s e s of ' ? -3 b t r a ns i t i o n h a s been c a r i e d o u t . Idolecular c o n s t a n t s for t h e upper ( 3 T ) and ground ( 3 A ) s t a t e s have been det ermined .

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