XUV-LASER SPECTROSCOPY OF HD AT 92-98 NM

Sub-Doppler excitation spectra of HD have been recorded in the range 9 2-98 nm with the use of a narrow-band and tunable extreme ultraviolet laser in combination with a molecular beam. Frequencies of 147 transit ions to the B (1) Sigma(u)(+), C (IIu)-I-1, and EF (1) Sigma(g)(+) sta tes have been calibrated with an average absolute accuracy of 0.035 cm (-1). The data have been analyzed in the framework of a semiempirical deperturbation model involving mutual couplings between nearby lying l evels of the B (1) Sigma(u)(+) and C (IIu)-I-1 states. Also, symmetry- breaking effects, i.e., interactions with EF (1) Sigma(g)(+) gerade st ates, were inferred from the data.