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Modeling Quantum Kinetics in Ion Traps: State‐changing Collisions for OH + ( 3 Σ - ) Ions with He as a Buffer Gas
Author(s) -
GonzálezSánchez L.,
Wester R.,
Gianturco F.A.
Publication year - 2018
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201800119
Subject(s) - ion , atomic physics , ion trap , buffer gas , chemistry , coupling (piping) , molecular dynamics , rotation (mathematics) , scattering , polyatomic ion , spin (aerodynamics) , trap (plumbing) , kinetics , physics , computational chemistry , materials science , thermodynamics , quantum mechanics , laser , geometry , organic chemistry , mathematics , meteorology , metallurgy
We present quantum scattering calculations for rotational state‐changing cross sections and rates, up to about 50 K of ion translational temperatures, for the OH + molecular ion in collision with He atoms as the buffer gas in the trap. The results are obtained both by using the correct spin‐rotation coupling of angular momenta and also within a recoupling scheme that treats the molecular target as a pseudo‐(1 Σ + ) state, and then compares our findings with similar data for the OH − (1 Σ + ) molecular partner under the same conditions. This comparison intends to link the cation behaviour to the one found earlier for the molecular anion. The full calculations including the spin‐rotation angular momenta coupling effects have been recently reported (L. González‐Sánchez and R. Wester and F.A. Gianturco, Mol.Phys.2018, DOI 10.1080/00268976.2018.1442597[1][L. González-Sánchez, 2018]) with the aim of extracting specific propensity rules controlling the size of the cross sections. The present study is instead directed to modelling trap cooling dynamics by further obtaining the solutions of the corresponding kinetics equations under different trap schemes so that, using the presently computed rates can allow us to indicate specific optimal conditions for the experimental setup of the collisional rotational cooling in an ion trap for the system under study.