Hits:

Indexed by:期刊论文

Date of Publication:2017-03-01

Journal:PHYSICS OF PLASMAS

Included Journals:SCIE、EI

Volume:24

Issue:3

ISSN No.:1070-664X

Abstract:The species, N-2(C), N-2(B), and N-2(+)(B), in the post-discharge of a nitrogen microwave induced discharge (2.45 GHz) at atmospheric pressure are investigated by means of optical emission diagnosis of the spatial distribution of emission intensities of N-2(C-B), N-2(B-A), and N-2(+)(B-X) transitions. Correspondingly, the post-discharge can be divided into two distinct regimes, the early and late afterglows. It is found that not only atomic N survives in the late afterglow regime of the post-discharge but also the N-2(+) ions are produced even far from the microwave launcher. This is attributed to the fact that the vibrationally excited N-2(X, v) and ground state N(S-4) with a long lifetime can be conveyed at far distance and act as the precursor for generating N-2(+) ions locally.