RT info:eu-repo/semantics/article
T1 Characterization of an atmospheric helium plasma jet by relative and absolute optical emission spectroscopy
A1 Xiong, Qing
A1 Nikiforov, Anton Yu
A1 González, Manuel Á
A1 Leys, Christophe
A1 Lu, Xin Pei
AB The characteristics of plasma temperatures (gas temperature and electron excitationtemperature) and electron density in a pulsed-dc excited atmospheric helium plasma jet are studied by relative and absolute optical emission spectroscopy (OES). High-resolution OES is performed for the helium and hydrogen lines for the determination of electron density through the Stark broadening mechanism. A superposition fitting method composed of two component profiles corresponding to two different electron densities is developed to fit the investigated lines. Electron densities of the orders of magnitude of 1021 and 1020 m−3 are characterized for the center and edge regions in the jet discharge when the applied voltage is higher than 13.0 kV. The atomic state distribution function (ASDF) of helium demonstrates that the discharge deviates from the Boltzmann–Saha equilibrium state, especially for the helium lower levels, which are significantly overpopulated. Local electron excitation temperatures T13 and Tspec corresponding to the lower and upper parts of the helium ASDF are defined and found  to range from 1.2 eV to 1.4 eV and 0.2 eV to 0.3 eV, respectively. A comparative analysis shows that the Saha balance is valid in the discharge for helium atoms at high excited states.
PB Institute of Physics
SN 0963-0252
YR 2013
FD 2013
LK https://uvadoc.uva.es/handle/10324/84268
UL https://uvadoc.uva.es/handle/10324/84268
LA eng
NO Plasma Sources Science and Technology, 2013, vol. 22, n. 1, p. 015011
DS UVaDOC
RD 27-abr-2026