Difference between revisions of "BielefeldGED:Equipment"

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File:Bielefeld_GED_Instrument_2012.png|The instrument in 2012
 
File:Bielefeld_GED_Instrument_2012.png|The instrument in 2012
 
File:Bielefeld_GED_Instrument_2013_6.jpg|December 2013, new pumps installed
 
File:Bielefeld_GED_Instrument_2013_6.jpg|December 2013, new pumps installed
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File:Bielefeld_GED_Instrument_May2014_2.jpg|May 2014, the Hiden MS was installed for first measurements
 
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Revision as of 13:52, 8 July 2015

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

News

Date Record
13 May 2015 A valve for separation of the diffraction and mass-spectrometer chambers has been built.
22 May 2014 Hiden PIC 1000 series mass-spectrometer has been installed.
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 [BergerZFN2009]Author: Berger, Raphael J. F.; Hoffmann, Manfred; Hayes, Stuart A.; Mitzel, Norbert W.
Journal: Z. Naturforsch B
Number: 11
Pages: 1259-1268
Title: An Improved Gas Electron Diffractometer -- The Instrument, Data Collection, Reduction and Structure Refinement Procedures
Volume: 64
Year: 2009
Link to Google Scholar
about this improved gas electron diffractometer contains lots of details.

Current state

History

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:

Bielefeld NDiffusionP 2013 1.jpg Bielefeld NDiffusionP 2013 2.jpg Bielefeld NDiffusionP 2013 3.jpg


Old diffusion pump:

Bielefeld ODiffusionP 2013 1.jpg Bielefeld ODiffusionP 2013 2.jpg

Turbo Pumps

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

Bielefeld TurboP 2013 1.jpg

Sector

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

Bielefeld Sector 2006.jpg Bielefeld Sector 2013 1.jpg Bielefeld Sector 2013 3.jpg

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 380 °C. However, it has also been successfully used for low temperatures below -15 °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.

Cold Trap

Cold trap designed for using liquid nitrogen and installed from the opposite to the inlet system side.

Bielefeld GED ColdTrap 2014.jpg

In-line mass-spectrometer

A Hiden mass-spectrometer (PIC 1000 series, up to 2500 amu) with EPIC ion counting detector is attached to the electron diffraction unit.


General view of the EPIC detector.
Details of the tip.
In housing of the GED unit.
Valve for separation of the mass-detector and diffraction chamber.

References

[BergerZFN2009]Berger, Raphael J. F.; Hoffmann, Manfred; Hayes, Stuart A.; Mitzel, Norbert W. (2009): An Improved Gas Electron Diffractometer -- The Instrument, Data Collection, Reduction and Structure Refinement Procedures. Z. Naturforsch B, 64, 1259-1268Link to Google Scholar
[ReuterZNB2016]Reuter, Christian G.; Vishnevskiy, Yury V.; Blomeyer, Sebastian; Mitzel, Norbert W. (2016): Gas electron diffraction of increased performance through optimization of nozzle, system design and digital control. Zeitschrift für Naturforschung B, 71, 1-13Link to Google Scholar