High-resolution Raman spectroscopy from collisionally populated states after optical pumping (II): (C2H2)-C13,(CCH2)-C-13-C-12,(CCCD2)-C-13-C-12 and (C2D2)-C-13

6 pags., 3 figs., 2 tabs.The combined use of a pump-probe Raman–Raman technique and the naturally occurring process of vibration-to-vibrationcollisional relaxation to populate and obtain high-resolution Raman spectra of vibrationally excited states that cannot be easilyaccessed by other means has been recently demonstrated in12C2H2and12C2D2(Martínez et al.).[1]This technique has been hereapplied to four other isotopologues of acetylene, namely13C2H2,13C12CH2,13C12CD2and13C2D2. Transitions from the v2= 2 andv4=2,v5= 1 collisionally populated states have been observed. The latter state was accessible only in the case of hydrogenatedmolecules. Accurate values of the spectroscopic parameters for the v2= 3 vibrationally excited states for all the isotopologues wereobtained, for the first time, from the least-squares analysis of the assigned transitions. In addition, the observation of Q branchlines of the v2=1, v4=2, v5=1← v4=2, v5= 1 band for13C2H2and13C12CH2allowed the spectroscopic characterization of theupper states. The harmonic term values and the anharmonicity constants, ω02, x022and y0222, have been derived for all the studiedmolecules. Copyright © 2016 John Wiley & Sons, Ltd.D.B. and R.Z.M. acknowledge the financial support of the Ministry of Economy and Competitiveness through Research Grant FIS2012-38175. G.D.L. and L.F. acknowledge the Università di Bologna and the financial support of the Ministero dell’Istruzione dell’Università e della Ricerca (PRIN 2012 ‘Spettroscopia e Tecnichecomputazionali per la ricerca Astrofisica, atmosferica e Radioastronomica’ (STAR)Peer Reviewe