UV Source for UPS Ultraviolet Photoelectron Spectroscopy, ARUPS

UV Source - UVS 200

Differentially Pumped, High Performance, Ultraviolet Source for Surface Analysis Applications

- UPS - Ultraviolet Photoelectron Spectroscopy -

Features:

UHV Mounting
Air cooled, UV-source, Water-Cooling NOT Required
High Flux >8 x 10¹⁵ Photons sr^-1s^-1
High intensity photocurrent between 15 nA .. 40 nA
Stable output of adjustable ratio of Helium I and Helium II lines
Easy operation / ignition / adjustment
Differential pumping
Port aligner for convenient beam positioning
Mounting flange: 2.75"OD (NW35CF)
Bakable up to 250° C
Optional: leak valve / gas inlet system / pumping system / polarizer

For Ultraviolet Photoelectron Spectroscopy on solids (UPS), the high performance Ultraviolet Source UVS 200 is ideally suited. The design of the discharge chamber results in high intensity and it also facilitates easy ignition and extremely stable operation of the discharge. The UVS 200 can be mounted to any 2.75"OD flange on an analysis chamber as flange-to-sample distances are not critical. The source is differentially pumped via the beam guide capillary (two pumping lines). This efficient pumping also ensures a long operating life. The He I / He II ratio can be controlled by adjusting the pressure of the discharge. The discharge capillary is air-cooled by a fan. When the fan is removed the source can be baked to 250°, allowing true UHV operation. Helium is normally used as operating gas but Neon and Argon may also be used.

UV Source Pumping Schematics

UV Source Controller UVC 200

Remote Control: 2 Analog Inputs, 2 Monitor Outputs, TTL Input Signal
Regulated Constant voltage for Initial Ignition
Regulated Constant Current Operational Mode
Operating voltage: 0-1500 V, Operating Current: 0-125 mA, Ignition Voltage: 6500 V
Controls for Voltage and Current and Push Button for Start
3 1/2 digital panel, two display modes (V or mA)
LEDs for voltage / current / fan fail and HV fail
115/230 V, 200VA, 50-60 Hz

The UVC 200 supplies all voltages and currents needed for the UVS 200 UV Source operation. It consists of a switch mode power unit, an ignition unit and a fan control unit. The power supply operates in constant voltage or constant current mode. Before ignition the power supply operates in voltage mode. The source is ignited by simply pressing a push button on the front panel of the power supply. The power supply also ensures fail safe operation of the UV-source. An interlock circuit turns off the high voltage applied to the source to prevent UV-source damage.

Application:

UV Photoemission Spectroscopy with EA 120 MCD Hemispherical Energy Analyzer

SPECS Technologies Corporation
3318 Plantation Dr.
Sarasota, Florida 34231
Phone: (941) 362-4877
Fax: (941) 364-9706
support@specs.com