Figure 10
From: Synergistic Effect of H2O2 and NO2 in Cell Death Induced by Cold Atmospheric He Plasma
A shielding gas of pure oxygen strongly inhibits the presence of OH and N2 molecules in the gas phase.
The emission spectra of the molecular bands of (A) OH (at around 309 nm), (B) N2(C) (Second Positive System at around 337 nm) and (C) N2+ (First Negative System at around 391 nm) and the atomic lines of (D) He (at around 706 nm) and (E) O (at around 777 nm) were recorded in the absence (no shielding) or presence (pure O2 shielding) of a shielding of pure O2. The gas flow of He was set to 100 sccm and the plasma is created by applying high voltage pulses with amplitude of 5.5 kV.
