The stretching fundamental bands ν1, ν2 and ν4 of H 28SiD 3

Abstract

The ν 1(A 1), Si–H stretching, ν 2(A 1) and ν 4(E), Si–D stretchings, fundamental bands of HSiD 3 have been recorded at an effective resolution of ca. 0.003 cm −1 between 2080 and 2280 cm −1 and between 1480 and 1720 cm −1, respectively. Ro-vibrational transitions of the H 28SiD 3 isotopologue have been assigned in the two spectral ranges, about 700 belonging to ν 1, with J′ up to 25 and K up to 21, and about 1600 to the ν 2/ ν 4 dyad, with J′ up to 24 and K′ up to 19. The spectra of all the bands evidence the existence of several perturbations. The transitions of ν 1 have been analyzed either neglecting or including in the model A 1/E Coriolis-type interactions with nearby dark states. The υ 2 = 1 and υ 4 = 1 states have been fitted simultaneously taking into account several ro-vibrational interactions between them and, in addition, with the υ 5 = 2, l = 0 component, and with few other close dark states. The standard deviation of the fit for both ν 1 and the ν 2/ ν 4 dyad is, however, more than one order of magnitude larger than the estimated experimental precision and is independent on the adopted model.