@article{bibcite_8527,
  author = {B. L. M. Klarenaar and A. S. Morillo and M. Grofulovic and M. C. M. van de Sanden and R. Engeln and O. Guaitella},
  title = {Excitation and relaxation of the asymmetric stretch mode of CO2 in a pulsed glow discharge},
  abstract = {The excitation and relaxation of the vibrations of CO2 as well as the reduction of CO2 to CO are studied in a pulsed glow discharge. Two diagnostics are employed: (1) time-resolved in situ Fourier transform infrared spectroscopy and (2) spatiotemporally resolved in situ rotational Raman spectroscopy. Experiments are conducted within a pressure range of 1.3{\textendash}6.7 mbar and a current range of 10{\textendash}50 mA. In the afterglow, the rate of exponential decay from the asymmetric stretch temperature (T 3) to the rotational temperature (T rot) is found to be only dependent on T rot, in the conditions under study. The decay rate rho T 3 - T rot follows the relation rho T 3-T rot=388 s-1 exp(T rot - 273 K / 154 K). Pressure and varying concentrations of CO and (presumably) atomic oxygen did not show to be of significant influence. In the active part of the discharge the excitation of T 3 showed to be positively related to current and negatively to pressure. However, the contribution of current to vibrational excitation is ambiguous: the conversion of CO2 and therefore the fraction of CO in the discharge, is found to be strongly dependent on the current, with a conversion factor of 0.05{\textendash}0.18 for 10{\textendash}50 mA, while CO can contribute to the excitation through near-resonant collisions. A clear relation between the elevation of T 3 and the dissociation of CO2 could not be confirmed, though conversion peaks are observed in the near afterglow, which motivate future experiments on vibrational ladder-climbing directly after termination of the discharge.},
  year = {2019},
  journal = {Plasma Sources Science and Technology},
  volume = {28},
  pages = {035011},
  doi = {10.1088/1361-6595/aada5e},
  language = {eng},
}