Abstract

The electric field above the cathode surface of an Ar hollow cathode discharge has been measured by optogalvanic Stark spectroscopy. The field depends on the radial position of illumination and describes the radial distribution of the space charge density, ρ(<i>r</i>), as ρ(<i>r</i>) = −<i>Ar</i> + <i>B</i>, where <i>r</i> is the radial position and the parameters <i>A</i> and <i>B</i> are positive. The values of <i>A</i> and <i>B</i> increase with the discharge current, but the width of the cathode fall region remains nearly constant at about 1.02 ± 0.03 mm for a brass cathode of 5 mm i. d.

PDF Article

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription