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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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_10895639_v119_n18_p4207_Carrera |
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todo:paper_10895639_v119_n18_p4207_Carrera2023-10-03T16:04:49Z Electric deflection of middle-size ammonia clusters containing (e-, Na+) Pairs Carrera, A. Marceca, E. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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, A. Marceca, E. 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. |
| format |
JOUR |
| author |
Carrera, A. Marceca, E. |
| author_facet |
Carrera, A. Marceca, E. |
| author_sort |
Carrera, A. |
| 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 |
| url |
http://hdl.handle.net/20.500.12110/paper_10895639_v119_n18_p4207_Carrera |
| work_keys_str_mv |
AT carreraa electricdeflectionofmiddlesizeammoniaclusterscontainingenapairs AT marcecae electricdeflectionofmiddlesizeammoniaclusterscontainingenapairs |
| _version_ |
1807318620757295104 |