Abstract
A novel type of white-eye pattern in a dielectric barrier discharge system has been investigated in this paper. It is a superposition of a hexagonal lattice and a white-eye stripe in appearance and evolves from a white-eye square grid state with the applied voltage increasing. Its spatio-temporal dynamics obtained by an intensified charge-coupled device shows that it consists of three transient rectangular sublattices. The spatiotemporally resolved evolutions of the molecular vibrational temperature and electron density of the pattern are measured by optical emission spectra. The evolution of surface charge distribution is given and its effect on the self-organized pattern formation is discussed.
Highlights
Patterns, a kind of self-organizing phenomenon, occur in a wide range of natural contexts
Optical emission spectra and the spatio-temporal distribution of the wall charges are given based on the estimation of the electron density for the first time
The spatiotemporally resolved evolutions of the molecular vibrational temperature and electron density of CPHW are measured by optical emission spectra
Summary
A kind of self-organizing phenomenon, occur in a wide range of natural contexts. The above white-eye superlattice patterns studied in DBD system are composed of three hexagonal or four square sublattices respectively. The results show that the CPHW is composed of three transient rectangular sublattices: big spots, small spots and halos (denoted by B, S and H, respectively), and the discharge sequence is B-S-H-B-S-H within one cycle of the voltage.
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