The stretching fundamental bands ν 1, ν 2 and ν 4 of H28SiD3

Abstract: The ν 1(A1), Si–H stretching, ν 2(A1) and ν 4(E), Si–D stretchings, fundamental bands of HSiD3 have been recorded at an effective resolution of ca. 0.003cm−1 between 2080 and 2280cm−1 and between 1480 and 1720cm−1, respectively. Ro-vibrational transitions of the H28SiD3 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 A1/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. [Copyright &y& Elsevier]