TY  - GEN
Y1  - 2021///
A1  - Paul, Daniel Roman
CY  - Heidelberg
KW  - Dissociative Recombination
KW  - 
DR
CH+ ions
KW  - 
cross section
KW  - 
recombination rate
KW  - 
plasma rate coefficient
KW  - 
final state branching ratio
KW  - 
dissociative CH state
KW  - 
Cryogenic Storage Ring
KW  - 
CSR
KW  - 
electron cooler
KW  - 
J=0
KW  - 
rotational states
UR  - https://archiv.ub.uni-heidelberg.de/volltextserver/30307/
N2  - The present work is concerned with an experimental study of the Dissociative Recombination (DR) process for rotationally cold CH+ ions. Experiments were conducted at the electron cooler of the Cryogenic Storage Ring (CSR) facility, a merged-electron-ion-beams setup. By storing CH+ ions up to 100 s in the T<10 K CSR environment, an ensemble of the lowest three rotational states was produced and time-dependent populations were additionally characterized via photodissociation.

With the methods developed in this work, the DR cross section is obtained in the collision energy range of 0-1.3 eV as a merged-beams rate coefficient and converted into a plasma rate coefficient, which can be used for modeling the chemistry in interstellar clouds. A confinement for the pure J=0 plasma rate is provided for this purpose, resulting from time-dependent measurements on the continually cooling rotational ensemble in CSR.
	
Imaging and arrival time detection of DR fragments are used for characterizing final atomic carbon and hydrogen states and angular fragment distributions. Here, collision energies of 0 meV, 8 meV, 70 meV and 320 meV are investigated. As a result, conclusions about the symmetry of intermediate dissociative states of the CH molecule, participating in the DR reaction, can be drawn.
TI  - Electron recombination studies of rotationally
cold CH+ ions at the Cryogenic Storage Ring
AV  - public
ID  - heidok30307
ER  -