Ease of operation, robust design and a high intensity make the HIS 13 a preferred excitation source for UPS. The source is available with multiple options such as a linear polarizer, 3rd differential pumping Stage or an attenuator to tune light intensity. More than 350 installed units stand for reliable quality. The VUV source power supply with up to 300 mA discharge current, integrated pressure gauge display and fast electronic ignition supports ease of operation and optimized source brightness.
The VUV source power supply with up to 300 mA discharge current, integrated pressure gauge
display and fast electronic ignition supports ease of operation and optimized source brightness.
High Intensity VUV Source – Highlights
- Long lifetime due to filament free design
- Ease of operation
- Robust design
- Discharge regulation
- Precise alignment with line of sight viewport
- More than 300 installed units
- Large range of options
Line width of Light Source
The line width of the gas phase spectrum is dominated by the Xe Doppler broadening and the analyser resolution. It proves a line width less than 2 meV of the HIS 13 operated with Ne.
Measured with Scienta Omicron EA 125
The VUV source power supply is a fully digital unit with integrated pressure measurement and automated plasma ignition. It delivers up to 1 kV anode voltage, up to 300 mA discharge current and a very stable discharge regulation.
• fully digital unit design
• Discharge regulation
• Integrated pressure measurement
• More than 300 installed units
• Automated plasma ignition
• Ease of operation
• 1 kV discharge voltage
• 300 mA discharge current
The spot diameter of the HIS 13 as well as the photon density on the sample depend on the chosen light capillary diameter of the lamp and the working distance between sample and light source in the experiment. The table below shows the values for exemplary setups.
|Capillary Diameter (mm)||0.8||1.2||1.7|
|Photon Flux (Ph/s)||5.0 · 1011||1.1 · 1012||2.3 · 1012|
|Spot Diameter (mm)|
|• at 10 mm working distance||1.1||1.5||2.0|
|• at 70 mm working distance||2.8||3.2||3.7|
|Photon Density (Ph/s/mm2)|
|• at 10 mm working distance||5.5 · 1011||6.6 · 1011||7.4 · 1011|
|• at 70 mm working distance||8.4 · 1010||1.4 · 1011||2.2 · 1011|
Further features of the lamp are:
|Useful gas discharge lines||He I, He II, Ne I, Ne II, Ar I, Ar II, Kr I, Kr II, Xe I, Xe II, H (Lyα, Lyβ)|
|Capillary||Selectable length & diameter|
|Discharge power||Up to 300 W|
|Operating pressure||Down to 10-10 mbar (He I)|
|Differential pumping||Two or three (optional) stage|
|Mounting flange||DN 40 CF 2¾″ OD|
|Alignment & discharge control||Via backside viewport|
|Adjustment||± 3° port aligner|
|Bake out temperature||Up to 250° C|
The drawing shows the standard configuration of a HIS 13 VUV lamp.
Optional Upgrades for HIS 13
The HIS 13 VUV light source can be expanded with different upgrades. Please contact us for further details.
Continously rotatable linear polariser for full exploitation of symmetry selection rules in photoemission
Attenuator for HIS 13/14 for VUV-sensitive samples. Variable reduction of photon flux by a factor 10 or 100.
Third differential pumping stage
The VUV lamp HIS 13 is extendable with all available options such as a 3rd differential pumping stage, an attenuator to tune light intensity, linear polarizer, a monochromator and two different focusing mirrors.
The standard 2-stage differential pumping allows for a system pressure of 10-8 – 10-9 mbar during operation for HeI. The third pumping stage reduces the pressure to the mid 10-10 mbar range depending on capillary diameter.
Even though most application in photo electron spectroscopy aim for maximum intensity there are opposite requirements when working on VUV-sensitive sample as for example organic materials. The Attenuator for HIS 13/14 allows for a variable reduction of photon flux by a factor 10 or 100.
Continously rotatable linear polarizer for full exploitation of symmetry selection rules in photoemission.
In order to realize a long working distance of 100 or 200 mm and a small beam spot down to 180 µm the HIS 13 can be equipped with two alternative focusing mirrors. For more details please refer to the HIS 14 HD page.