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514 results on '"Falcinelli, Stefano"'

209. Interaction components in HX2+ bond

Author

Candori, Pietro, Falcinelli, Stefano, Vecchiocattivi, Franco, Pirani, Fernando, and Tarantelli, Francesco

Subjects
Interaction bond, molecular dications, TPEsCO technique
Published
2006

212. Penning ionization of N2O molecules by He*(2(3,1)S) and Ne*(3P2,0) metastable atoms: theoretical considerations about the intermolecular interactions

Author

Biondini, F., Brunetti, Brunetto Giovanni, Candori, Pietro, De Angelis, F., Falcinelli, Stefano, Tarantelli, Francesco, Pirani, Fernando, and Vecchiocattivi, Franco

Subjects
metastable atoms, intermolecular interactions, dynamics, Penning ionization
Abstract

A theoretical investigation of the intermolecular interaction, operative in collision complexes of He*(2 3S1), He*(2 1S0), and Ne*(3P2,0) with N2O, is carried out to explain the main results of the experimental study reported in the preceding paper. The analysis is carried out by means of a semiempirical method based on the identification, modeling, and combination of the leading interaction components, including the effect of the selective polarization of the more external electronic cloud of the metastable atom in the intermolecular electric field. These and other crucial aspects of our approach have been quantitatively verified by ab initio calculations. The proposed method permits to evaluate the interaction at any configuration of the complexes and provides a useful and inexpensive representation of the intermolecular potential energy for dynamics studies. The main experimental findings can be rationalized taking into account the critical balancing between molecular orientation effects in the intermolecular interaction field and the ionization probability. These orientation effects tend to become less pronounced with increasing collision energy.

Published
2005

213. Penning ionization of N2O molecules by He*(2(3,1)S) and Ne*(3P2,0) metastable atoms: a crossed beam study

Author

Biondini, F., Brunetti, Brunetto Giovanni, Candori, Pietro, De Angelis, F., Falcinelli, Stefano, Tarantelli, Francesco, Moix Teixidor, M., Pirani, Fernando, and Vecchiocattivi, Franco

Subjects
collisional autoionization, molecular beam scattering, metastable atoms
Abstract

The energetics of [Rg... N2O]* autoionizing collision complexes (where Rg=He or Ne) and their dynamical evolution have been studied in a crossed beam apparatus, respectively, by Penning ionization electron spectroscopy (PIES) and by mass spectrometry (MS) techniques in the thermal energy range. The PIES spectra, detected by an electron energy analyzer, were recorded for both complexes at four different collision energies. Such spectra allowed the determination of the energy shifts for Penning electron energy distributions, and the branching ratios for the population of different electronic states and for the vibrational population in the molecular nascent ions. For the [Ne...N2O]* collision complex it was found, by MS, that the autoionization leads to the formation of N2O+, NO+, O+, and NeN2O+ product ions whose total and partial cross sections were measured in the collision energy range between 0.03 and 0.2 eV. The results are analyzed exploiting current models for the Penning ionization process: the observed collision energy dependence in the PIES spectra as well as in the cross sections are correlated with the nature of the N2O molecule orbitals involved in the ionization and are discussed in term of the Rg-N2O interaction potentials, which are estimated by using a semiempirical method developed in our laboratory.

Published
2005

219. Double Photo-ionization of Hydrogen halide molecules

Author

Alagia, M., Biondini, Francesco, Brunetti, Brunetto Giovanni, Candori, Pietro, Falcinelli, Stefano, Moix Teixidor, M., Pirani, Fernando, Richter, R., Stranges, S., and Vecchiocattivi, Franco

Subjects
double photoionization, synchrotron radiation, hydrogen halide, threshold photon-electron's coincidence, molecular dication, photoionization, molecular dications, mass spectrometry
Published
2004

221. ENERGY AND STRUCTURE OF MOLECULAR DICATIONS HX2+

Author

Moix Texidor, M., Pirani, Fernando, Candori, Pietro, Falcinelli, Stefano, and Vecchiocattivi, Franco

Subjects
double photoionization, molecular dications, mass spectrometry
Published
2004

228. The low lying electronic states of HBr2+

Author

Moix Teixidor, M., Pirani, Fernando, Candori, Pietro, Falcinelli, Stefano, Vecchiocattivi, Franco, and Tarantelli, Francesco

Subjects
electronic states, molecular dication, intermolecular interaction
Published
2003

232. Charge Transfer in the Elementary Processes

Author

Bassi, D., Brunetti, Brunetto Giovanni, Candori, Pietro, Cappelletti, David Michele, Falcinelli, Stefano, Pirani, Fernando, Rapaccini, B., Tosi, P., Vecchiocattivi, M., and Vecchiocattivi, Franco

Subjects
charge trasfer, elementary reactions, interaction potentials
Published
2002

234. Lo scambio di carica nei processi chimici elementari

Author

Bassi, D., Brunetti, Brunetto Giovanni, Candori, Pietro, Cappelletti, David Michele, Falcinelli, Stefano, Pirani, Fernando, Rapaccini, B., Tosi, P., Vecchiocattivi, Franco, and Vecchiocattivi, M.

Subjects
scambio di carica, processi chimici elementari, spettrometria di massa
Published
2002

238. IONIZATION OF WATER MOLECULE BY NEON METASTABLE ATOMS

Author

Brunetti, Brunetto Giovanni, Lescop, B., Boustimi, M., Candori, Pietro, Falcinelli, Stefano, Vecchiocattivi, Franco, Formica, F., Paolicelli, G., and Stefani, G.

Subjects
water molecule, Penning ionization, mass spectrometry
Published
2001

249. Penning ionization of fullerene

Author

Brunetti, Brunetto Giovanni, Candori, Pietro, Chergui, M., Falcinelli, Stefano, Ferramosche, R., Sassara, A., and Vecchiocattivi, Franco

Subjects
fullerene, Penning ionization, mass spectrometry
Published
1998

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