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DTSTART:20190331T030000
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DTSTART:20181028T020000
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DTSTAMP:20260406T092217Z
UID:5c0f83d11297e194332395@ist.ac.at
DTSTART:20190321T110000
DTEND:20190321T120000
DESCRIPTION:Speaker: Andreas Osterwalder\nhosted by Misha Lemeshko\nAbstrac
 t: I will present our work on fundamental aspects of low-energy gas-phase 
 chemical reactions. In thepast years we have developed a method that allow
 s us to merge two neutral supersonic expansionsusing inhomogeneous electri
 c and/or magnetic fields.[1] We obtain state-purified samples ofpolarized 
 atoms or molecules with well-defined velocities\, which in turn offers hig
 hly controlledconditions for scattering experiments. In particular\, the m
 erged beam technique currently is theonly way to reach relative reactant v
 elocities in molecular beams that correspond to collisionenergies under 1 
 K\, opening doors towards the investigation of fundamental quantum mechani
 caleffects in chemistry that are not visible at room temperature.We recent
 ly combined the merged beam technique with methods to orient reactants[2\,
 3] andstudied\, for the first time\, sub-Kelvin stereodynamics in a protot
 ypical energy transfer reaction\,namely between metastable Ne(3P2) and gro
 und state Ar atoms[4]. This reaction can proceed alongtwo pathways\, one p
 roducing Ne(1S)+Ar++e- (called Penning ionization)\, the other one produci
 ngNeAr++e- (associative ionization). At high energies the branching ratio 
 between these channels canbe controlled through the orientation of the Ne(
 3P2) atom\, but this ability is lost at low energiesdue to a reorientation
  of the reactants.[1] A. Osterwalder\, EPJ Techniques and Instrumentation 
 2\, 10 (2015).[2] J. Zou\, S.D.S. Gordon\, S. Tanteri\, and A. Osterwalder
 \, J. Chem. Phys. 148\, 164310 (2018).[3] S.D.S. Gordon\, J. Zou\, S. Tant
 eri\, J. Jankunas\, and A. Osterwalder\, Phys. Rev. Lett. 119\, 053001 (20
 17).[4] S.D.S. Gordon\, J.J. Omiste\, J. Zou\, S. Tanteri\, P. Brumer\, an
 d A. Osterwalder\, Nature Chemistry 43\, 7279(2018).
LOCATION:Mondi Seminar Room 2\, Central Building\, ISTA
ORGANIZER:cpetz@ist.ac.at
SUMMARY:Andreas Osterwalder: Stereodynamics of chemical reactions near abso
 lute zero
URL:https://talks-calendar.ista.ac.at/events/1685
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