Wydział Chemii

K. S. Rutkowski

S. M. Melikova

T. D. Kolomiitsova

N. N. Filippov

Aleksander Koll

2001

Journal of Molecular Structure

596

179-183

10.1016/S0022-2860(01)00711-6

Naukowa

Angielski

Artykuł

The IR absorption spectra of CO₂ doped Xe solutions have been recorded in the range of the fundamental ν₃(Σ_u) band and of the Coriolis perturbed ν₁+ν₂¹, ν₁+ν₂¹¹(π_u) Fermi doublet (ν₁+ν₂≈3ν₂) in gas, liquid and solid phases. The characteristic transformation and rapid narrowing of the ν₃ band, observed in the gas to liquid phase transition, shows marked hindering of the rotational motion of the CO₂ molecule in dense Xe mixtures. It was found that the liquid to solid phase transition is accompanied by noticeable broadening of the ν₃ band. The rotational motion of CO₂ is not frozen in solid Xe at least near the freezing point. This is in contrast with sharp narrowing of the vibrational bands and so with blocking up rotations in the case of a heavier CS₂ guest in the solid Xe host just below the freezing point. The intensity ratio A(ν₁+ν₂¹)/A(ν₁+ν₂¹¹) of the Coriolis perturbed ν₁+ν₂¹, ν₁+ν₂¹¹ doublet reveals the noticeable increase from 8±1 in a low density gas to 18±2 in the liquid phase. The results obtained suggest remarkable modification of the second-order Coriolis coupling in the case of CO₂ doped dense liquid Xe.

Vibrational spectra, CO2, Noble gas solutions, Phase transition, Rotational relaxation processes, Coriolis coupling

https://doi.org/10.1016/S0022-2860(01)00711-6

http://www.elsevier.com