The selective role of long-range forces in the stereodynamics of ion–molecule reactions: the He++methyl formate case from guided-ion-beam experiments

Andrea Cernuto, Fernando Pirani, Luca Matteo Martini, Paolo Tosi, Daniela Ascenzi

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

8 Citaties (Scopus)

Uittreksel

Long-range intermolecular forces play a crucial role in controlling the outcome of ion–molecule chemical reactions, such as those determining the disappearance of organic or inorganic “complex” molecules recently detected in various regions of the interstellar medium due to collisions with abundant interstellar atomic ions (e.g. H+ and He+). Theoretical treatments, for example, based on simple capture models, are nowadays often adopted to evaluate the collision-energy dependence of reactive cross sections and the temperature dependent rate coefficients of many ion–molecule reactions. The obtained results are widely used for the modelling of phenomena occurring in different natural environments or technological applications such as astrophysical and laboratory plasmas. Herein it is demonstrated, through a combined experimental and theoretical investigation on a prototype ion–molecule reaction (He++methyl formate), that the dynamics, investigated in detail, shows some intriguing features that can lead to rate coefficients at odds with the expectations (e.g. Arrhenius versus anti-Arrhenius behaviour). Therefore, this study casts light on some new and general guidelines to be properly taken into account for a suitable evaluation of rate coefficients of ion–molecule reactions.

Originele taal-2Engels
Pagina's (van-tot)51-59
Aantal pagina's9
TijdschriftChemPhysChem
Volume19
Nummer van het tijdschrift1
DOI's
StatusGepubliceerd - 5 jan 2018
Extern gepubliceerdJa

Vingerafdruk

formates
Ion beams
Chemical reactions
ion beams
Ions
Plasmas
Molecules
coefficients
collisions
intermolecular forces
Experiments
Temperature
casts
chemical reactions
astrophysics
prototypes
evaluation
cross sections
methyl formate
molecules

Citeer dit

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The selective role of long-range forces in the stereodynamics of ion–molecule reactions : the He++methyl formate case from guided-ion-beam experiments. / Cernuto, Andrea; Pirani, Fernando; Martini, Luca Matteo; Tosi, Paolo; Ascenzi, Daniela.

In: ChemPhysChem, Vol. 19, Nr. 1, 05.01.2018, blz. 51-59.

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

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