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Libuda Group

Instrumentation and Methods

 

Experimental Systems:

The group operates cutting-edge instruments and develops new experimental solutions that bridge between ideal ultraclean environments and true operation conditions (high-pressure, solid/liquid, electrochemical, photoelectrochemical environments).

“MOBY II”

A unique molecular beam / spectroscopy / reactor experiments been designed and set up, which allows us to perform most complex kinetic experiments in a quantitative, reproducible and fully remote-controlled fashion. Among other facilities, the system includes:

MOBY-II (image: FAU)

MOBY-II (image: FAU)

  • Pulsed / chopped supersonic molecular beam source
  • Four modulated effusive beam sources
  • Vacuum-FT-IR-spectrometer for time resolved surface IR spectroscopy (TR-IRAS)
  • In-situ UV photochemistry in UHV
  • Fast ion-counting quadrupole mass spectrometer (QMS) w. multichannel scaling
  • Fast TR-IRAS-compatible pressure gap reactor
  • High-pressure cell for polarization-dependent TR-IRAS
  • Various preparation and characterization techniques for model surfaces (TPD, LEED, AES, etc.)
  • Vacuum sample transfer system

“CIRCAT”

A new operando spectroscopy system brings together approaches to the preparation of catalytically active materials from different projects within the Excellence Cluster Engineering of Advanced Materials, including single-crystal based model catalysts, porous materials and films, powders, ionic liquid films, heterogenized homogeneous catalysts and others.

CIRCAT (image: FAU)

CIRCAT (image: FAU)

The key features of the system include:

  • IRAS (IR Reflection Absorption Spectroscopy)
  • TR-IRAS (Time Resolved IR Spectroscopy, including Step Scan FTIR and Rapid Scan FTIR)
  • PM-IRAS (Polarization Modulation IRAS)
  • TIRS (Transmission IR Spectroscopy)
  • DRIFTS (Diffuse Reflection IR FT Spectroscopy)
  • Transient and Stationary Experiments (Pulse Gas Dosing and Laser Heating)
  • Real-Time Mass Spectrometry
  • Online High Sensitivity Gas Chromatography
  • Vacuum Transfer of UHV-Prepared Model Catalysts

 “SMURF”

A new high-end UHV-IRAS facility allows time-resolved in-situ studies of surface reactions, deposition, growth processes and nanomaterial synthesis.

SMURF (image: FAU)

SMURF (image: FAU)

The key features include:

  • Vacuum-FT-IR-spectrometer for time resolved surface IR spectroscopy (TR-IRAS)
  • Combined IR spectroscopy in the FIR and MIR region (automatic beamsplitter changer)
  • Two remote-controlled gas dosers for adsorption studies
  • Two metal evaporator sources in IR measurement position
  • Two IL/organic evaporator sources in IR measurement position
  • TPD in IR measurement position
  • Four modulated effusive beam sources
  • Various preparation and characterization techniques for model surfaces (TPD, LEED, AES, etc.)
  • Vacuum sample transfer system

“ELISA I”

The IR spectro-electrochemistry system allow in-situ studies on electrified interfaces, both on real materials and on ideal model surface. The system allows electrochemical characterization and sample transfer under controlled conditions, including in-situ and time resolved photoelectrochemical studies.

ELISA I (image: FAU)

The key features include:

  • High-end vacuum-FT-IR-spectrometer
  • IR optics for fixed and variable angle
  • Time resolved interfacial IR spectroscopy (rapid scan and step scan)
  • Home-built electrochemical cells for IR spectroscopy in external reflection and in ATR
  • Spectroelectrochemistry in internal and external reflection (EC-IRRAS, SNIFTIRS, LPSIRS, SEIRAS)
  • Gas supply system for electrocatalytic studies (e.g. fuel cell, electrolysers, electrosynthesis)
  • Electrochemical characterization methods (cyclic voltammetry, electrochemical impedance spectroscopy)
  • Single crystal electrochemistry and characterization

“ELISA II”

The new ELISA II system allow in-situ preparation of complex model catalysts in UHV and direct sample transfer the (spectro)eectrochemical cell.

ELISA II (image: FAU)

The key features include:

  • UHV system with sample preparation (e.g. PVD) and characterization facilities (LEED, AES, TPD, etc.)
  • Sample transfer system (vacuum/protective gas)
  • Electrochemical characterization techniques: cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS)
  • Direct transfer to electrochemical IR spectroscopy (EC-IRRAS), differential electrochemical mass spectrometry (DEMS), electrochemical atomic force microscopy (EC-AFM), electrochemical scanning tunneling microscopy (EC-STM)

“EMMA”

The new EMMA system is designed for electrochemical mass spectrometry at thin film samples, nanostructured electrodes and complex model electrodes prepared in UHV (direct sample transfer).

EMMA (image: FAU)

The key features include:

  • Double differentially pumped UHV system with QMS
  • Differential electrochemical mass spectrometry (DEMS) in thin-film configuration
  • Online electrochemical mass spectrometry (OLEMS) with microprobe for planar model electrodes

“ELSA”

The new ELSA system combines electrochemical scanning tunneling microscopy (EC-STM) and atomic force microscopy (EC-AFM) in controlled atmosphere with the preparation and transfer of complex model electrodes prepared in UHV (direct sample transfer).

ELSA (image: FAU)

The key features include:

  • Electrochemical atomic force microscopy (EC-AFM)
  • Electrochemical scanning tunneling microscopy (EC-STM)
  • Sample transfer environment from UHV
  • Controlled gas environment and supply system
  • EC-STM tip preparation