The energetic of (CH2F2)2 investigated by TDL IR spectroscopy and DFT computations: From collision induced relaxation of ro-vibrational transitions to non-covalent interactions

Weakly-bound clusters of atmospheric molecules: infrared spectra and structural calculations of (CO2)n-(CO)m-(N2)p, (n,m,p) = (2,1,0), (2,0,1), (1,2,0), (1,0,2), (1,1,1), (1,3,0), (1,0,3), (1,2,1), (1,1,2)

Structural calculations and high-resolution infrared spectra are reported for trimers and tetramers containing CO₂ together with CO and/or N₂. Among the 9 clusters studied here, only (CO₂)₂-CO was previously observed by high-resolution spectroscopy. The spectra, which occur in the region of the ν₃ fundamental of CO₂ (≈2350 cm^-1), were recorded using a tunable optical parametric oscillator source to probe a pulsed supersonic slit jet expansion. The trimers (CO₂)₂-CO and (CO₂)₂-N₂ have structures in which the CO or N₂ is aligned along the symmetry axis of a staggered side-by-side CO₂ dimer unit. The observation of two fundamental bands for (CO₂)₂-CO and (CO₂)₂-N₂ shows that this CO₂ dimer unit is non-planar, unlike (CO₂)₂ itself. For the trimers CO₂-(CO)₂ and CO₂-(N₂)₂, the CO or N₂ monomers occupy equivalent positions in the 'equatorial plane' of the CO₂, pointing toward its C atom. To form the tetramers CO₂-(CO)₃ and CO₂-(N₂)₃, a third CO or N₂ monomer is then added off to the 'side' of the first two. In the mixed tetramers CO₂-(CO)₂-N₂ and CO₂-CO-(N₂)₂, this 'side' position is taken by N₂ and not CO. In addition to the fundamental bands, combination bands are also observed for (CO₂)₂-CO, CO₂-(CO)₂, and CO₂-(N₂)₂, yielding some information about their low-frequency intermolecular vibrations.

Micro-solvation of CO in water: infrared spectra and structural calculations for (D2O)2–CO and (D2O)3–CO

The weakly-bound molecular clusters (D₂O)₂–CO and (D₂O)₃–CO are observed in the C–O stretch fundamental region (≈2150 cm⁻¹), and their rotationally-resolved infrared spectra yield precise rotational parameters.

Towards the SMART workflow system for computational spectroscopy

Is it possible to convert highly specialized research in the field of computational spectroscopy into robust and user-friendly aids to experiments and industrial applications?