BielefeldGED:Equipment

This page contains description of equipment used by GED group in Bielefeld.

News

Date	Record
28 Feb 2014	A new booster pump (Edwards EH500) has been installed.
20 Dec 2013	A new diffusion pump (Edwards Diffstak 250/2000P) has been installed.

Instrument

The reconstructed Balzers Eldigraph KD-G2 (one of only two still existing ones worldwide) is presently in use in the laboratory. The most recent paper <bib id="BergerZFN2009" /> about this improved gas electron diffractometer contains lots of details.

Current state

History

GED instrument in April 2006 (Uni-Münster)	The apparatus with new gun, power supply and recording system (image plates), Jun 2007	November 2007, the apparatus is already in Uni-Bielefeld
September 2009, more control devices	May 2011, heavily improved control panel	The instrument in 2012

Pumps

Backing Pumps

Backing (fore-vacuum) pumps: Edwards x05 Scrollpump Oilfree, Edwards E2M80 oil pump and Edwards EH500 booster pump. Our last oilfree pump worked 48822.8 hours. On the pictures is the new one.

Edwards E2M80 oil pump (left) and x05 Scrollpump Oilfree pump (right).

The same pumps from side.

More recent picture with the booster pump on top of the oil pump.

Diffusion Pumps

New diffusion pump (Edwards Diffstak 250/2000P), installed in December, 2013:

Old diffusion pump:

Turbo Pumps

Turbo pump (Edwards EXT70H) attached to the electron gun:

Sector

A sin²-type sector (common formula is A*sin²(r/B)) is used.

Inlet Systems

Room-temperature Nozzle

Inlet device for room temperatures (used by Heinz Oberhammer).

Nozzle tip.

Medium-temperature Nozzle

This nozzle has been constructed for evaporation of compounds in a temperature range from 25 to 400 °C.

General view of the inlet device.

A thin copper tube for a gas standard (like CO2) is shown.

A Swagelok valve is used.

Nozzle tip.

References

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