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SUMMARY:DESIREE: A tool for cooling and colliding oppositely charged ions
DTSTART:20260414T140000Z
DTEND:20260414T160000Z
DTSTAMP:20260503T013300Z
UID:indico-event-51630@agenda.infn.it
DESCRIPTION:Speakers: Henning Zettergren (Università di Stoccolma)\n\nDep
 artment of Physics\, Stockholm University\, SE-10691\, Stockholm\, Sweden\
 nLow-energy ion–pair collisions are expected to play a decisive role in 
 the chemistry of dilute\nenvironments where anions\, rather than electrons
 \, act as the primary negative charge carriers [1].\nUnder such conditions
 \, reactions can occur that are prohibited for neutral molecules at therma
 l\nenergies. This is due to the Coulomb driven acceleration between the op
 positely charged ions\,\nallowing for unique bond forming reactions\, grow
 th of new species\, or formation of energetic neutrals\nwith velocities we
 ll above the thermal ones. Consequently\, these reactions may be crucial f
 or the\nchemical evolution of molecules in\, e.g.\, the interstellar mediu
 m and planetary atmospheres.\nThe cryogenically cooled ion beam storage ri
 ng facility DESIREE (Double ElectroStatic Ion Ring\nExpEriment) is uniquel
 y designed for studies of collisions between oppositely charged ions prepa
 red\nin well-defined or narrow ranges of quantum states and with fine-cont
 rol of the collision energy down\nto the sub-electronvolt regime [2\,3]. F
 urthermore\, the excellent vacuum conditions allow studies of\ninherent pr
 operties and the dynamics of atomic\, molecular\, and cluster ions on time
 scales exceeding\nminutes and in unprecedented detail.\nIn this talk\, I w
 ill highlight recent DESIREE results\, including high-precision measuremen
 ts of\nelectron affinities [4\,5] and studies of molecular stability and c
 ompeting relaxation pathways explored\nin previously inaccessible time dom
 ains [6-9]. I will also present studies of mutual neutralization\nreaction
 s involving atoms [10]\, small di- and tri-atomic molecular systems [11-14
 ]\, and complex\nmolecules such as polycyclic aromatic hydrocarbons (PAHs)
  and fullerenes [15]. These results are\nimportant for improving the accur
 acy of models describing chemical processes in\, e.g.\, planetary\natmosph
 eres and a range of astrophysical environments.\n \nReferences\n[1] T. J.
  Millar\, C Walsh\, & T. A. Field\, Chem. Rev. 117\, 1765 (2017)\n[2] R. D
 . Thomas et al\, Review Scientific Instruments 82\, 0655112 (2011).\n[3] H
 . T. Schmidt et al\, Review Scientific Instruments 84\, 055115 (2013).\n[4
 ] J. E. N. Navarrete\, et al\, Physical Review Letters. 135\, 213001 (2025
 ).\n[5] M. K. Kristiansson et al\, Nature Communications 13\, 5906 (2022).
 \n[6] J. N. Bull et al. Physical Review Letters 134\, 228002 (2025).\n[7] 
 P K Najeeb et al. Physical Review Letters 131\, 113003 (2023).\n[8] M. Sto
 ckett et al\, Nature Communications. 14 395 (2023).\n[9] M. Gatchell et al
 \, Nature Communications 12\, 6646 (2021).\n[10] See e.g. J. Grumer et al\
 , Physical Review Letters 128\, 033401 (2022) and references therein.\n[11
 ] A. Bogot et al\, Nature Chemistry 17\, 541 (2025).\n[12] M. Poline et al
 \, Nature Communications. 16\, 8528 (2025).\n[13] M. Poline et al\, Physic
 al Review Letters 132\, 023001 (2024).\n[14] A. Bogot et al\, Science 383\
 , 285-289 (2024).\n[15] M. Gatchell et al\, Astronomy & Astrophysics 694\,
  A43 (2025).\n\nhttps://agenda.infn.it/event/51630/
LOCATION:Aula Conversi (Dipartimento di Fisica-Ed. G.Marconi)
URL:https://agenda.infn.it/event/51630/
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