Kinetic study of CO2 plasmas under nonequilibrium conditions. II. Input of vibrational energy

• Type: Article in International Scientific Journal
• Date: 2018-11-12

Authors

Carlos D. Pintassilgo (Author) FEUP; M. Grofulovic (Author) Other; T. Silva (Author) Other; B. L. M. Klarenaar (Author) Other; A. S. Morillo Candas (Author) Other; O. Guaitella (Author) Other; R. Engeln (Author) Other; V. Guerra (Author) Other

Journal

Title: PLASMA SOURCES SCIENCE & TECHNOLOGY

Vol. 27 No. 11

Pages: 1-12

Publisher: IOP Publishing

Indexing

ISI Web of Science

Scopus

INSPEC

Scientific classification

CORDIS: Physical sciences ; Technological sciences

Other information

DOI: 10.1088/1361-6595/aadb60

Abstract (EN): This is the second of two papers presenting the study of vibrational energy exchanges in non-equilibrium CO2 plasmas in low-excitation conditions. The companion paper addresses a theoretical and experimental investigation of the time relaxation of similar to 70 individual vibrational levels of ground-state CO2(X (1)Sigma(+)) molecules during the afterglow of a pulsed DC glow discharge, operating at pressures of a few Ton and discharge currents around 50 mA, where the rate coefficients for vibration-translation (V-T) and vibration-vibration (V-V) energy transfers among these levels are validated (Silva et al 2018 Plasma Sources Sci. Technot 27 015019). Herein, the investigation is focused on the active discharge, by extending the model with the inclusion of electron impact processes for vibrational excitation and de-excitation (e-V). The time-dependent calculated densities of the different vibrational levels are compared with experimental data obtained from time-resolved in situ Fourier transform infrared spectroscopy. It is shown that the vibrational temperature of the asymmetric stretching mode is always larger than the vibrational temperatures of the bending and symmetric stretching modes along the discharge pulse-the latter two remaining very nearly the same and close to the gas temperature. The general good agreement between the model predictions and the experimental results validates the e-V rate coefficients used and provides assurance that the proposed kinetic scheme provides a solid basis to understand the vibrational energy exchanges occurring in CO2 plasmas.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 12