Simultaneous analysis of the rovibrational levels upsilon(4)=1, 2, and 3 of HCCI and DCCI based on infrared spectra

The energy levels nu (4) = , nu (4) = 2, and nu (4) = 3 of DCCI have been a nalyzed by using the fundamental v(4)(1) (470-520 cm(-1)) and the overtone 2 nu (0)(4) (955-1005 cm(-1)) bands together with the hot bands 2 nu (0.2)( 4) <-- nu (1)(4), 3 nu (1.3)(4) <-- 2 nu (0.2)(4), and 3 nu (1)(4) <-- nu ( 1)(4). In the case of HCCI the previously studied hot bands connected to nu (4) have been completed by adding 3 nu (1)(4) <-- nu (1)(4) into the analy sis. The various l-type resonances have been tal;en into account in the ana lyses of both the isotopomers. Furthermore, the Coriolis resonance between the close-lying nu (3) and nu (4) of DCCI has been considered. Altogether, accurate values for the molecular constants and the resonance (p)arameters have been obtained from simultaneous analysis and they have been compared w ith those from separate analyses for different levels. (C) 2001 Academic Pr ess.