Dynamics of Formation and Evaporation of Mixed Alkali Halide Nanocrystals; A Case of Comparable Lattice Energies.

The relative intensity distribution of the [Rb,K14-nI13](+) mixed nanocrystals containing a ''magic'' number of 14 metal cations and 13 iodide anions is examined. These nanocrystals were generated through sputtering of mixed RbI/KI solids using fast atom bombardment and analyzed by use of a double-focusing sector-field mass spectrometer. The relative intensities of the observed peaks are found to have a ''bimodal'' distribution with a maximum near n = 7. This observation is explained by assuming: (a) a rate of formation that is proportional to the number of isomers that can be formed for each mixed nanocrystal, and (b) a rate of dissociation that is insensitive to the composition of the mixed nanocrystal. The later assumption leads to the conclusion that the internal energies of these mixed nanocrystals are similar and independent of their composition. This conclusion is supported by the results of Monte Carlo simulation annealing as well as by the similarity of the known lattice energies of KI and RbI bulk crystals.

Main Author: Ahmadi, Temer S.
Other Authors: El-Sayed, Mostafa A.
Format: Villanova Faculty Authorship
Language: English
Published: 1994
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dc_source_str_mv The Journal of Physical Chemistry 98(44), November 3, 1994, 11316–11320.
author Ahmadi, Temer S.
author_facet_str_mv Ahmadi, Temer S.
El-Sayed, Mostafa A.
author_or_contributor_facet_str_mv Ahmadi, Temer S.
El-Sayed, Mostafa A.
author_s Ahmadi, Temer S.
spellingShingle Ahmadi, Temer S.
Dynamics of Formation and Evaporation of Mixed Alkali Halide Nanocrystals; A Case of Comparable Lattice Energies.
author-letter Ahmadi, Temer S.
author_sort_str Ahmadi, Temer S.
author2 El-Sayed, Mostafa A.
author2Str El-Sayed, Mostafa A.
dc_title_str Dynamics of Formation and Evaporation of Mixed Alkali Halide Nanocrystals; A Case of Comparable Lattice Energies.
title Dynamics of Formation and Evaporation of Mixed Alkali Halide Nanocrystals; A Case of Comparable Lattice Energies.
title_short Dynamics of Formation and Evaporation of Mixed Alkali Halide Nanocrystals; A Case of Comparable Lattice Energies.
title_full Dynamics of Formation and Evaporation of Mixed Alkali Halide Nanocrystals; A Case of Comparable Lattice Energies.
title_fullStr Dynamics of Formation and Evaporation of Mixed Alkali Halide Nanocrystals; A Case of Comparable Lattice Energies.
title_full_unstemmed Dynamics of Formation and Evaporation of Mixed Alkali Halide Nanocrystals; A Case of Comparable Lattice Energies.
collection_title_sort_str dynamics of formation and evaporation of mixed alkali halide nanocrystals; a case of comparable lattice energies.
title_sort dynamics of formation and evaporation of mixed alkali halide nanocrystals; a case of comparable lattice energies.
format Villanova Faculty Authorship
description The relative intensity distribution of the [Rb,K14-nI13](+) mixed nanocrystals containing a ''magic'' number of 14 metal cations and 13 iodide anions is examined. These nanocrystals were generated through sputtering of mixed RbI/KI solids using fast atom bombardment and analyzed by use of a double-focusing sector-field mass spectrometer. The relative intensities of the observed peaks are found to have a ''bimodal'' distribution with a maximum near n = 7. This observation is explained by assuming: (a) a rate of formation that is proportional to the number of isomers that can be formed for each mixed nanocrystal, and (b) a rate of dissociation that is insensitive to the composition of the mixed nanocrystal. The later assumption leads to the conclusion that the internal energies of these mixed nanocrystals are similar and independent of their composition. This conclusion is supported by the results of Monte Carlo simulation annealing as well as by the similarity of the known lattice energies of KI and RbI bulk crystals.
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dc.title Dynamics of Formation and Evaporation of Mixed Alkali Halide Nanocrystals; A Case of Comparable Lattice Energies.
dc.creator Ahmadi, Temer S.
El-Sayed, Mostafa A.
dc.description The relative intensity distribution of the [Rb,K14-nI13](+) mixed nanocrystals containing a ''magic'' number of 14 metal cations and 13 iodide anions is examined. These nanocrystals were generated through sputtering of mixed RbI/KI solids using fast atom bombardment and analyzed by use of a double-focusing sector-field mass spectrometer. The relative intensities of the observed peaks are found to have a ''bimodal'' distribution with a maximum near n = 7. This observation is explained by assuming: (a) a rate of formation that is proportional to the number of isomers that can be formed for each mixed nanocrystal, and (b) a rate of dissociation that is insensitive to the composition of the mixed nanocrystal. The later assumption leads to the conclusion that the internal energies of these mixed nanocrystals are similar and independent of their composition. This conclusion is supported by the results of Monte Carlo simulation annealing as well as by the similarity of the known lattice energies of KI and RbI bulk crystals.
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