Self-consistent Kinetic Model of a Flowing Nitrogen Afterglow

• Type: Article in International Scientific Journal
• Date: 2004

Authors

Paulo Araújo Sá (Author) FEUP; V. Guerra (Author) Other; J. Loureiro (Author) Other; N. Sadeghi (Author) Other

Journal

Title: Journal of Physics D: Applied Physics

Vol. 37 No. 2

Pages: 221-231

ISSN: 0022-3727

Publisher: Institute of Physics Publishing

Scientific classification

FOS: Natural sciences

Other information

DOI: 10.1088/0022-3727/37/2/010

Abstract (EN): A detailed kinetic model for the flowing nitrogen microwave discharge and post-discharge is developed with the aim of gaining a deeper understanding into the processes responsible for the formation of the short-lived afterglow of nitrogen and for the enhancement of the concentration of metastable, measured at approximately the same position in Sadeghi et al (2001 J. Phys. D: Appl. Phys. 34 1779). The present work shows that the peaks observed in the afterglow, for the density of molecules in radiative N2(B 3Πg) and and metastable states, can be explained as a result of a pumping-up phenomenon into the vibrational ladder produced by near-resonant V–V energy-exchange collisions, involving vibrationally excited molecules in levels as high as v ∼ 35. The present predictions are shown to be in good agreement with the measured concentrations for metastables and N(4S) atoms, and with the emission intensities of 1+ and 1− system bands of N2.

Language: Portuguese

Type (Professor's evaluation): Scientific

No. of pages: 11