Spectroscopic investigations of corona discharge in high pressure helium at 300 K

¹ Laboratoire G2Elab CNRS & Joseph Fourier University, 25 rue des Martyrs, 38042 Grenoble, France
² Joint Institute for High Temperatures, RAS, 125412 Moscow, Russia
³ Topchiev of Petrochemical Synthesis Institute, RAS, 119991 Moscow, Russia

^a e-mail: atrazhev@yandex.ru

Received: 7 December 2010
Accepted: 17 February 2011
Published online: 21 July 2011

Abstract

Gaseous Helium at 300 K and pressure (0.1–3) MPa was excited using a corona discharge both for negative and positive high voltages. The light emitted from the ionization zone of the discharge was analyzed. Asymmetric shape of atomic lines 706 nm and 728 nm was recorded. Blue wings of the lines are more intensive than their red wings. The line shape is described as a convolution of Lorentz profile of the line center and a quasi-statistical profile of a blue wing of the line. Such analysis predicts no heating of the gas in the ionization zone for positive corona and considerable heating for negative corona.