Dr. Eberl MBE-Komponenten GmbH - valved mercury evaporation source HGS

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	HGS 63-250 valved mercury evaporation source on DN63 CF (O.D. 4.5") mounting flange with 250 cm³ evaporator reservoir		High throughput of up to 60g Hg/h Large capacity 250 cm³ evaporator 3000 cm³ (40kg Hg) equalizing tank Larger capacity on request Easy and safe refilling procedure Compatible with most MBE systems Valved Mercury Evaporation Source Data Sheet ( 255 kB pdf-file )


	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.		HGS 63-250 source mounted to UHV chamber


	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.		Equalizing tank with level control viewport

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 Hg_1-xCd_xTe infrared photodiods

	Principle sketch of the HGS		Injector tube Cell flange All-metal valve Evaporator reservoir Equalizing tank

References

C.R. Becker, V. Latussek, G. Landwehr, L.W. Molenkamp, Physical Review B 68 035202 (2003)
Y.S. Gui, C.R. Becker et.al., Physical Review B 70 115328 (2004)
V. Latussek, C.R. Becker, G. Landwehr, Physical Review B 71 125305 (2005)

Technical Data

Heating system	3 separate heater-circuits (thermostat, valve & injector)
Thermocouple	2x type K Chromel/Alumel (injector/valve); 1x PT100 (reservoir)
Bakeout temperature	300°C
Operating temperature	injector: 210°C; valve: 230°C; reservoir: 180°C
Outgassing temperature	injector: 250°C; valve: 230°C; reservoir: 180°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 Gasket Dimensions".



		[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 cm³)
*** specify UHV length L with order
Example for Product Identfication Code: HGS 63-250-L300D36 is a valved mercury evaporation source on DN63 CF flange with 250cm³ evaporator reservoir and UHV-length 300mm.



LAST UPDATE: APRIL, 2007		© 2003 Dr. Eberl MBE-Komponenten GmbH