- High throughput of up to 60g Hg/h
- Large capacity 250 cm 3 evaporator
- 3000 cm 3 (40kg Hg) equalizing tank
- Larger capacity on request
- Easy and safe refilling procedure
- Compatible with most MBE systems Datasheet
Introduction
The Valved Mercury (Hg) Evaporation Source HGS is designed for evaporation of elemental mercury in standard UHV or MBE systems. The source consists of the 250 cm3 evaporator, heated by a thermostat, the heated valve and the heated injector unit which acts as the interface to the UHV system. Both components valve and injector are heated independently to avoid material condensation.
The source provides precise flux stability of better ± 0.1% by ± 0.03K temperature control of the evaporator reservoir using external heating. Precise longterm flux stability is achieved up to very high flux rates by a liquid level stabilization using an external equalizing tank.The evaporator reservoir is connected to the external tank which allows continuous hydrostatic refill of the evaporator reservoir in order to keep the liquid level within the evaporator constant.
The integrated pneumatic all metal valve allows rapid on/off switching of the Hg beam.
Easy and safe refilling is provided by an additional container which is mounted to the equalizing tank and which can be filled from air side.
The vacuum tight pneumatic valve allows venting the MBE system without breaking the vacuum inside the HGS evaporator.
The mercury source HGS has been developed in cooperation and is built under license of University of Würzburg (Germany) and with the advice of Dr. C.R. Becker from the University of Würzburg.
Application
Most applications in II-VI Hg MBE need a high throughput of up to 10-30 g Hg/h for optimum growth conditions. With its large equalizing tank of 3000 cm³ (40 kg Hg) the HGS guarantees stable flux conditions and suitable loads for a growth campaign.
Typical applications for the HGS are:
II-VI Hg MBE, e.g. growth of Hg based compounds and heterostructures
production of MCT devices, e.g Hg1-xCdxTe infrared photodiods
1. Injector tube
2. Cell flange
3. All-metal valve
4. Evaporator reservoir
5. Equalizing tank
Technical data
| Filament type | 3 separate heater-circuits (thermostat, valve & injector) |
| Thermocouple | 2x type K Chromel/Alumel (injector/valve); 1x PT100 (reservoir) |
| Operating temperature | injector: 210°C; valve: 230°C; reservoir: 180°C |
| Outgassing temperature | injector: 250°C; valve: 230°C; reservoir: 180°C |
| Bakeout temperature | 250°C |
| Evaporator reservoir | 250 cm³ |
| Flux control | integrated valve unit |
| Valve control | pneumatic operation, manual and remote control with TTL signal |
Specific data
For general information on CF mounting flanges see Flange and Gasketdimensions .
| Product | CF flange | Nominal capacity | UHV dimensions*** [mm] | max. electrical [W]/[A] | Power supply product code | |
|---|---|---|---|---|---|---|
| [cm3 ] | [mm] / [mm] | [W] / [A] | Product code | |||
| HGS | 63* - | 250**- | LxxxD36 | 2300 / 10 | HGSU control unit |
* other mounting flange diameters on request ** heated reservoir capacity (equalizing tank 3000 cm 3 ) *** specify UHV length L with order
Product code: e.g. **HGS 63-250-L300D36 ** is a valved mercury evaporation source on DN63 CF flange with 250cm³ evaporator reservoir and UHV-length 300mm.
