Electric deflection of middle-size ammonia clusters containing (e-, Na+) Pairs

Effective polarizabilities of Na(NH<inf>3</inf>)<inf>n</inf> (n = 8-27) clusters were measured by electric deflection as a function of the particle size. A significant field-induced shift of the beam intensity profile without the occurrence of broadening revealed that the clu...

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Detalles Bibliográficos
Autores principales:	Carrera, Alvaro, Marceca, Ernesto Jose
Publicado:	2015
Materias:	Ammonia Particle size Ammonia clusters Beam intensity profile Cluster temperature Electric deflection Polarizabilities Solvation process Unpaired electrons Valence electron Solvents
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10895639_v119_n18_p4207_Carrera http://hdl.handle.net/20.500.12110/paper_10895639_v119_n18_p4207_Carrera
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_10895639_v119_n18_p4207_Carrera
record_format	dspace
spelling	paper:paper_10895639_v119_n18_p4207_Carrera2023-06-08T16:06:34Z Electric deflection of middle-size ammonia clusters containing (e-, Na+) Pairs Carrera, Alvaro Marceca, Ernesto Jose Ammonia Particle size Ammonia clusters Beam intensity profile Cluster temperature Electric deflection Polarizabilities Solvation process Unpaired electrons Valence electron Solvents Effective polarizabilities of Na(NH<inf>3</inf>)<inf>n</inf> (n = 8-27) clusters were measured by electric deflection as a function of the particle size. A significant field-induced shift of the beam intensity profile without the occurrence of broadening revealed that the clusters behave as liquidlike polar objects in the conditions of the experiment (cluster temperatures were estimated in the range of 110-145 K). Most of the cluster polarity is attributed to the spontaneous promotion of the alkali atom valence electron to a diffuse state stabilized by the cluster solvent field, with the consequent formation of (e-, Na+) pairs. The average modulus of the dipole of Na-NH<inf>3</inf> clusters, μ<inf>0</inf>, was determined using the Langevin-Debye theory, and the data was compared with previous measurements obtained for Na-H<inf>2</inf>O clusters. Sodium-doped ammonia clusters exhibit much larger μ<inf>0</inf> values and a step size dependence which is not present when the solvent is water. This evidence suggests that while the (e-, Na+) structure is rather compact in Na(H<inf>2</inf>O)<inf>n</inf> clusters and remains almost unchanged during the solvation process, in Na(NH<inf>3</inf>)<inf>n</inf> the unpaired electron abandons the proximity of the Na+ ion and gradually extends and occupies new solvent shells. © 2015 American Chemical Society. Fil:Carrera, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Marceca, E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10895639_v119_n18_p4207_Carrera http://hdl.handle.net/20.500.12110/paper_10895639_v119_n18_p4207_Carrera
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Ammonia Particle size Ammonia clusters Beam intensity profile Cluster temperature Electric deflection Polarizabilities Solvation process Unpaired electrons Valence electron Solvents
spellingShingle	Ammonia Particle size Ammonia clusters Beam intensity profile Cluster temperature Electric deflection Polarizabilities Solvation process Unpaired electrons Valence electron Solvents Carrera, Alvaro Marceca, Ernesto Jose Electric deflection of middle-size ammonia clusters containing (e-, Na+) Pairs
topic_facet	Ammonia Particle size Ammonia clusters Beam intensity profile Cluster temperature Electric deflection Polarizabilities Solvation process Unpaired electrons Valence electron Solvents
description	Effective polarizabilities of Na(NH<inf>3</inf>)<inf>n</inf> (n = 8-27) clusters were measured by electric deflection as a function of the particle size. A significant field-induced shift of the beam intensity profile without the occurrence of broadening revealed that the clusters behave as liquidlike polar objects in the conditions of the experiment (cluster temperatures were estimated in the range of 110-145 K). Most of the cluster polarity is attributed to the spontaneous promotion of the alkali atom valence electron to a diffuse state stabilized by the cluster solvent field, with the consequent formation of (e-, Na+) pairs. The average modulus of the dipole of Na-NH<inf>3</inf> clusters, μ<inf>0</inf>, was determined using the Langevin-Debye theory, and the data was compared with previous measurements obtained for Na-H<inf>2</inf>O clusters. Sodium-doped ammonia clusters exhibit much larger μ<inf>0</inf> values and a step size dependence which is not present when the solvent is water. This evidence suggests that while the (e-, Na+) structure is rather compact in Na(H<inf>2</inf>O)<inf>n</inf> clusters and remains almost unchanged during the solvation process, in Na(NH<inf>3</inf>)<inf>n</inf> the unpaired electron abandons the proximity of the Na+ ion and gradually extends and occupies new solvent shells. © 2015 American Chemical Society.
author	Carrera, Alvaro Marceca, Ernesto Jose
author_facet	Carrera, Alvaro Marceca, Ernesto Jose
author_sort	Carrera, Alvaro
title	Electric deflection of middle-size ammonia clusters containing (e-, Na+) Pairs
title_short	Electric deflection of middle-size ammonia clusters containing (e-, Na+) Pairs
title_full	Electric deflection of middle-size ammonia clusters containing (e-, Na+) Pairs
title_fullStr	Electric deflection of middle-size ammonia clusters containing (e-, Na+) Pairs
title_full_unstemmed	Electric deflection of middle-size ammonia clusters containing (e-, Na+) Pairs
title_sort	electric deflection of middle-size ammonia clusters containing (e-, na+) pairs
publishDate	2015
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10895639_v119_n18_p4207_Carrera http://hdl.handle.net/20.500.12110/paper_10895639_v119_n18_p4207_Carrera
work_keys_str_mv	AT carreraalvaro electricdeflectionofmiddlesizeammoniaclusterscontainingenapairs AT marcecaernestojose electricdeflectionofmiddlesizeammoniaclusterscontainingenapairs
_version_	1768544051465814016

Electric deflection of middle-size ammonia clusters containing (e-, Na+) Pairs

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