The chemical physics of halomethanes is an important and challenging topic in several areas of chemistry in particular in the chemistry of the atmosphere. Among the class of halomethanes, the diiodomethane molecule has attracted some interest in the last years, but despite this, the information on its radical cation[CH2I2]·+is still limited. In this work, we measured and calculated the appearance energy (AE) of the ionic fragments I2·+and CH2·+and correlated the different fragmentation channels to the electronic states of the cation via photoelectron-photoion coincidence (PEPICO) experiments.In the case of the CH2/I2·+ channel, the experimentally determined AE is in excellent agreementwith the adiabatic theoretical value while a discrepancy is observed for the CH2·+/I2channel.This discrepancy can be understood accounting for a fragmentation involving the formation oftwo I atoms (CH2·+/2I channel), which, as explained by time dependent density functional theory(TD-DFT) calculations, occurs when[CH2I2]·+ excited states are involved

A joint theoretical and experimental study on diiodomethane: Ions and neutrals in the gas phase / Satta, Mauro; Bolognesi, Paola; Cartoni, Antonella; Casavola, Anna Rita; Catone, Daniele; Markus, Pal; Avaldi, Lorenzo. - In: THE JOURNAL OF CHEMICAL PHYSICS. - ISSN 0021-9606. - STAMPA. - 143:24(2015), pp. 244312-1-244312-8. [10.1063/1.4937425]

A joint theoretical and experimental study on diiodomethane: Ions and neutrals in the gas phase

SATTA, Mauro;CARTONI, Antonella
;
2015

Abstract

The chemical physics of halomethanes is an important and challenging topic in several areas of chemistry in particular in the chemistry of the atmosphere. Among the class of halomethanes, the diiodomethane molecule has attracted some interest in the last years, but despite this, the information on its radical cation[CH2I2]·+is still limited. In this work, we measured and calculated the appearance energy (AE) of the ionic fragments I2·+and CH2·+and correlated the different fragmentation channels to the electronic states of the cation via photoelectron-photoion coincidence (PEPICO) experiments.In the case of the CH2/I2·+ channel, the experimentally determined AE is in excellent agreementwith the adiabatic theoretical value while a discrepancy is observed for the CH2·+/I2channel.This discrepancy can be understood accounting for a fragmentation involving the formation oftwo I atoms (CH2·+/2I channel), which, as explained by time dependent density functional theory(TD-DFT) calculations, occurs when[CH2I2]·+ excited states are involved
2015
physics and astronomy (all); physical and theoretical chemistry
01 Pubblicazione su rivista::01a Articolo in rivista
A joint theoretical and experimental study on diiodomethane: Ions and neutrals in the gas phase / Satta, Mauro; Bolognesi, Paola; Cartoni, Antonella; Casavola, Anna Rita; Catone, Daniele; Markus, Pal; Avaldi, Lorenzo. - In: THE JOURNAL OF CHEMICAL PHYSICS. - ISSN 0021-9606. - STAMPA. - 143:24(2015), pp. 244312-1-244312-8. [10.1063/1.4937425]
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