Comment on 'Cleaning properties of atomic oxygen excited to metastable state 2s~22p~4(~1S_0) [J. Appl. Phys. 102, 083304 (2007)]'

摘要

It is shown that the spectrum attributed in the work of Shun'ko and Belkin [J. Appl. Phys. 102, 083304 (2007)] to the 557 nm forbidden transition of oxygen, O(~1S_0→~1D_2), induced by collision with argon atoms is probably the chemiluminescence from the O+NO reaction. Also, given the less than 0.1 ms lifetime of O(~1S_0) atoms in the gas flow, they cannot survive during the transport to the surface, and hence they cannot be responsible for the observed cleaning effect.