The discharge for plasma Stark shift measurement and results for He I 706.522 nm line

Abstract

© 2015. We present results of Stark shift measurements for He I 706.522nm (1s2p ³P<inf>2</inf>⁰-1s3s ³S<inf>1</inf> and 1s2p ³P<inf>1</inf>⁰-1s3s ³S<inf>1</inf>) lines using newly constructed pulsed arc generated at the pressure of two hundreds of milibars of helium with small admixture of hydrogen. Plasma electron number density in the range (0.5-7.0)×10²³m^-3 was measured from the wavelength separation between the allowed He I 447.1nm (2p ³P⁰-4d ³D) line and its forbidden component (2p ³P⁰-4d ³F⁰), while the electron temperature in the range (15,000-20,000)K was determined from the relative intensities of Si II lines using the Boltzmann plot technique. New Stark shift measurement technique was demonstrated using line shape recording of several He I lines. The shift results for He I 706.522nm line so favorably compare with earlier lower density experimental data that best fit formula is recommended for plasma diagnostic purposes.