VUV and UV Sources and Spectroscopic Applications

摘要

Extensive experimental studies of small molecules as potential 'hosts' for shortwavelength (lambda < 200 nm) energy-storage lasers have been conducted. Laser spectroscopy of the rare gas dimers and Group IIB dimers have yielded structural constants for a significant number of previously unobserved states. Also, Fano 'windows' have been observed in Ne2 in the energy region lying between v(+) = 0 and v(+) =3 of the Ne2(+) ground state X sq. Epsilon. Bound free emission studies of Cd2 and Zn2 have been carried out and the structural constants for the (1) Epsilon upper states have been determined. The growth of GaAs and GaN by photo-assisted MOCVD has also been demonstrated. Gallium arsenide has been grown epitaxially at temperatures as low as 450 C by illuminating the surface with ArF (193nm) radiation. Also, polycrystalline GaN (preferentially oriented (100)) has been grown on GaAs and sapphire at temperatures as low as 700 C and at growth rates exceeding 2 micrometers/hour.