TY - JOUR

T1 - Collision-Induced Transformation of the Complex Vibrational Susceptibility of a Linear Molecule Using the Example of the ν3 Band of Carbon Dioxide

AU - Коузов, Александр Петрович

AU - Асфин, Руслан Евгеньевич

AU - Филиппов, Николай Николаевич

AU - Егорова, Наталия Ивановна

PY - 2024/5/1

Y1 - 2024/5/1

N2 - The simultaneous transformation of both components of the complex isotropic vibrational susceptibility, which occurs with an increase in the density of a gas consisting of linear molecules, is traced for thefirst time in terms of the quantum model of strong collisions. The vibrational susceptibility of the CO2 molecule in the region of the fundamental ν3 band is discussed in detail as a case in point. It is found that withinthe region of anomalous dispersion adjacent to frequency ν3, there is a spectral interval that is characterizedby positive dispersion and exists in a fairly wide pressure range. This interval narrows upon an increase inpressure and disappears at a density of around 100 Amagat, completely blurring the branch structure of theabsorption band. It is shown that allowing for the spectral exchange between the lines of the rotational structure of the band is equally important for quantitatively interpreting the spectrum of the real part of susceptibility and reproducing a correct picture of the transformation of the absorption spectrum.

AB - The simultaneous transformation of both components of the complex isotropic vibrational susceptibility, which occurs with an increase in the density of a gas consisting of linear molecules, is traced for thefirst time in terms of the quantum model of strong collisions. The vibrational susceptibility of the CO2 molecule in the region of the fundamental ν3 band is discussed in detail as a case in point. It is found that withinthe region of anomalous dispersion adjacent to frequency ν3, there is a spectral interval that is characterizedby positive dispersion and exists in a fairly wide pressure range. This interval narrows upon an increase inpressure and disappears at a density of around 100 Amagat, completely blurring the branch structure of theabsorption band. It is shown that allowing for the spectral exchange between the lines of the rotational structure of the band is equally important for quantitatively interpreting the spectrum of the real part of susceptibility and reproducing a correct picture of the transformation of the absorption spectrum.

KW - collisional broadening

KW - dispersion of complex vibrational polarizability of linear molecules

UR - https://www.mendeley.com/catalogue/5505c5e6-81ff-3d8e-908b-fa3435aaf41f/

U2 - 10.1134/s0036024424050157

DO - 10.1134/s0036024424050157

M3 - Article

VL - 98

SP - 864

EP - 869

JO - Russian Journal of Physical Chemistry A

JF - Russian Journal of Physical Chemistry A

SN - 0036-0244

IS - 5

ER -