Model PDS Soft X-Ray Penning source

Features:

Applications:

Description

Model PDS is a continuous Penning discharge lamp for use in many laboratory applications. Unlike a standard gas discharge lamp, Model PDS uses an intense magnetic field to confine the electrons emitted by the cathode, allowing substantially higher electron energies to be achieved, thereby exciting emission lines at soft X-Ray energies in the source gas and in the highly ionized material sputtered from the cathode. The user connects the source to a supply of cooling water, a supply of gas for the discharge (non-harzardous gases such as neon and argon are commonly used), and a high voltage supply able to provide >0.5 A at > 2 KV. The Soft X-Ray source produces up to twelve bright emission line features for each combination of discharge gas and cathode material. Aluminum and magnesium cathodes are provided with the source, and replacements are available from us.

For attachment to the user's vacuum system a 3" quick-connect flange is provided. The pressure in the source is about 20 microns when first lit, then reduced to an operating pressure of 10^-4 to 10^-5 torr. A typical pumping speed required for the user's vacuum system is 150 liters per second. Pressure isolation for downstream components such as detectors may be provided by thin film filters or a low-conductance aperture (for example, the narrow slits on a monochromator) plus differential pumping.

Specifications

Emission lines (Å); Brightest Features in Red Boldface Type

Magnesium 119 120 125 130 133 138 140 147 161 165 171 180 182 187 232 234

Aluminum 86 89 91 94 100 104 108 112 117 124 130 160 170 232 234

Neon 204 208 212 215 218 223 228 242 251 267 283

Oxygen 242 249 264 267 272 275 277 280 296 300 304

Argon 56 Although argon itself does not produce many emission features, it is an excellent electron provider, and enhances the intensity of the cathode metal lines when used as a source gas.

We also provide Photon Counting 2D Imaging Detectors, Flight Ready UV sensors and Custom UV Optical Systems and Detectors.