Experimental techniques
What we measure ?
We measure the yield, the mass spectra, the kinetic and angular distributions of emitted neutral particles. The morphology of bombarded surfaces is also investigated.
How we measure ?
0.5 - 15 keV ion gun and 0.1-5 keV electron guns are used to stimulated desorption. The beam is formed into few hundred nanoseconds pulses that are focused into less than 1 mm diameter spot on the surface.

The emitted neutral particles are ionized by collisions with ~70 eV electrons in ionizer of a quadrupole mass analyzer [1] 


Low ionization efficiency ~ 10-2 but ionizes everything

or by photons emitted from the dye laser pumped with pulsed YAG  laser in EARN system [2].


High ionization efficiency ~ 1 for resonance ionization but molecules must have pirydyne ring

Surface morphology is probed with Scanning Tunneling Microscope and Atomic Force Microscope [3] 

Experimental set-up at IF UJ (room 17)
Our experimental set-up consists of analytic chamber equipped with: 
  • load lock system;
  • quadrupole mass spectrometer with electron impact ionizer used to measure mass and time of flight (kinetic energy) distributions of desorbing particles;
  •  LEED spectrometer with CCD camera;
  • reflectron-type secondary ion time-of-flight mass spectrometer TOF-SIMS;
  • hemispherical electron and ion energy analyzer with ability to perform angle resolved measurements;
  • ion and electron guns.

Experimental set-up is pumped by a system of turbomolecular and ion pumps. 

 
 

 
 

Our Au(111)/Mica and  Au(111)/Si substrates used in experiments with self-assembled monolayers are prepared in an evaporating system shown below. This system is equipped with several evaporators. Layer thickness is controlled by a quartz microbalance.

 

 

  1. experimental system is located at the Institute of Physics, Jagiellonian University, Poland.

  2. experimental system is located at the Pennsylvania State University, USA.

  3. experimental system is located at the Regional Laboratory of Physicochemical Analysis, Jagiellonian University, Poland 


    4.