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SUMMARY:Benchmarking and developing models for molecule-surface potential 
 energy surfaces. The difficulties and opportunities arising from experimen
 tal data which is too detailed and too sensitive - Gil Alexandrowicz\, Dep
 artment of Chemistry\, The University of Swansea
DTSTART:20240523T140000Z
DTEND:20240523T150000Z
UID:TALK212689@talks.cam.ac.uk
CONTACT:Stephen Walley
DESCRIPTION:In our group we have developed an interferometry based techniq
 ue which is capable of controlling and measuring the rotational projection
  quantum state of ground state hydrogen molecules\, before and after they 
 collide with a surface [1-3]. The technique is based on ultra-low-energy (
 pico eV) manipulations using a series of inhomogeneous and homogeneous mag
 netic fields. The complexity of the interference patterns we can measure a
 llows us to quantitatively measure changes of the complex amplitudes of th
 e rotational wave function\, which in turn are extremely sensitive to the 
 interaction potential the molecule experienced during the scattering event
 . During the seminar I will explain the technique and show examples for th
 e type of information that can be obtained from rotationally elastic and r
 otationally inelastic scattering experiments. I will show how our results 
 compare with state-of-the-art DFT based calculations and briefly present a
  new direction we are examining\, which is the possibility of extracting e
 mpirically based 6d potential energy surfaces directly from measurements.\
 n \n \n[1] Nat. Comms.8\, 15357 (2017) [2] Nat. Comms.11\, 3110 (2020) [3]
  Nat. Comms.13\,  2287 (2022) 
LOCATION:Mott Seminar Room\, Cavendish Laboratory
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