Role of long-lived N-2(X-1 Sigma(+)(g), upsilon) molecules and N-2(A(3)Sigma(+)(u)) and N-2(a'(1)Sigma(-)(u)) states in the light emissions of an N-2 afterglow

• Tipo: Artigo em Revista Científica Internacional
• Data: 2001

Autores

Loureiro, J (Autor) Outra; P. A . Sá (Autor) FEUP; Guerra, V (Autor) Outra

Revista

Título: Journal of Physics D: Applied Physics

Vol. 34 Nº 12

Páginas: 1769-1778

ISSN: 0022-3727

Editora: Institute of Physics Publishing

Indexação

ISI Web of Knowledge - 50 Citações

Scopus - 56 Citações

Outras Informações

ID Authenticus: P-000-V6G

DOI: 10.1088/0022-3727/34/12/303

Abstract (EN): The enhancement of N-2(B (3) Pi (g)) and N-2(+)(B (2) Sigma (+)(u)) states, responsible by the emission bands for the 1(+) and 1(-) systems of N-2, in the short-lived afterglow of a flowing N-2 microwave discharge at omega/(2 pi) = 433 MHz is investigated by modelling. It is shown that pronounced maxima for both emissions are obtained downstream from the discharge by assuming the formation of N-2(A (3) Sigma (+)(u)) and N-2(a' (1) Sigma (-)(u)) states by collisions of N-2 (X (1) Sigma (+)(g), upsilon) molecules in highly vibrational levels with N(S-4) atoms. Other channels that can also produce the emissions are investigated as well, but the common factor in all of them is the role played by the vibrationally excited N-2(X,upsilon) molecules in levels > 35. During the relaxation process a pumping-up effect for the vibrational quanta at the higher vth levels occurs as a result of near-resonant V-V energy-exchange collisions, that produces a rise in the observed peaks for the N-2 electronic states in the flowing afterglow.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10