Observations of a mode transition in a hydrogen hollow cathode discharge using phase resolved optical emission spectroscopy | Zendy

Sam Dixon | Zendy; Christine Charles | Zendy; James Dedrick | Zendy; Timo Gans | Zendy; Deborah O’Connell | Zendy; Rod Boswell | Zendy

Open Access

Observations of a mode transition in a hydrogen hollow cathode discharge using phase resolved optical emission spectroscopy

Author(s) -

Sam Dixon,

Christine Charles,

James Dedrick,

Timo Gans,

Deborah O’Connell,

Rod Boswell

Publication year - 2014

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4889916

Subject(s) - cathode , atomic physics , balmer series , hydrogen , materials science , plasma , electron , electric discharge , spectroscopy , plasma diagnostics , phase (matter) , emission spectrum , optics , chemistry , electrode , physics , spectral line , organic chemistry , quantum mechanics , astronomy

Two distinct operational modes are observed in a radio frequency (rf) low pressure hydrogen hollow cathode discharge. The mode transition is characterised by a change in total light emission and differing expansion structures. An intensified CCD camera is used to make phase resolved images of Balmer α emission from the discharge. The low emission mode is consistent with a typical γ discharge, and appears to be driven by secondary electrons ejected from the cathode surface. The bright mode displays characteristics common to an inductive discharge, including increased optical emission, power factor, and temperature of the H2 gas. The bright mode precipitates the formation of a stationary shock in the expansion, observed as a dark region adjacent to the source-chamber interface.

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