DPG Phi
Verhandlungen
Verhandlungen
DPG

SAMOP 2021 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

MO: Fachverband Molekülphysik

MO 5: Miscellaneous

MO 5.1: Talk

Thursday, September 23, 2021, 10:45–11:00, H2

Dissociative recombination of OH+ at the Cryogenic Storage Ring — •Ábel Kálosi1,2, Klaus Blaum2, Lisa Gamer2, Manfred Grieser2, Robert von Hahn2, Leonard W. Isberner2,3, Julia I. Jäger2, Holger Kreckel2, Daniel Paul2, Daniel W. Savin1, Viviane C. Schmidt2, Andreas Wolf2, and Oldřich Novotný21Columbia Astrophysics Laboratory, Columbia University, New York, 10027 New York, USA — 2Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany — 3I. Physikalisches Institut, Justus-Liebig-Universität Gießen, 35392 Gießen, Germany

The cosmic-ray ionization rate (CRIR) of atomic H is an important parameter for diffuse interstellar cloud models. The protons from hydrogen ionization by cosmic rays initiate subsequent ion-molecule reactions that lead to the gas-phase formation of complex molecules. OH+ forms early in this chain of reactions, but it can be destroyed via dissociative recombination (DR) with free electrons. The combination of chemical models and astronomical observations of OH+ enables one to quantitatively estimate the CRIR in diffuse interstellar clouds. Such models require rate coefficients that account for the internal excitation of the reactants. We have stored fast OH+ ion beams in the cryogenic environment of CSR, where infra-red active diatomic hydrides will relax to their lowest rotational states within minutes of storage. Here, we present merged beams DR experiments for OH+ interacting with free electrons produced in a low-energy electron cooler, probing collisions at translational temperatures as low as ∼ 10 K.

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2021 > SAMOP