Corr, CormacSteen, PGGraham, W G2015-12-070963-0252http://hdl.handle.net/1885/25885A reproducible instability, which appears similar to those reported previously, has been observed and studied in a low-pressure 13.56 MHz inductively coupled gaseous electronics conference rf cell operating in oxygen. The instability has been observed inKeywords: Electron energy levels; Light modulation; Negative ions; Oxygen; Plasma oscillations; Plasma stability; Positive ions; Pressure effects; Probability distributions; Electron energy distribution function; Gas pressure; Inductively coupled oxygen plasma; Neg200310.1088/0963-0252/12/2/3182015-12-07