DYNAMICS OF FORMATION AND EVAPORATION OF MIXED-ALKALI HALIDE NANOCRYSTALS - A CASE OF COMPARABLE LATTICE ENERGIES

被引：3

作者：

AHMADI, TS ^{[1
]}

ELSAYED, MA ^{[1
]}

机构：

[1] UNIV CALIF LOS ANGELES,DEPT CHEM & BIOCHEM,LOS ANGELES,CA 90024

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1994年 / 98卷 / 44期

关键词：

D O I：

10.1021/j100095a013

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：11316 / 11320

页数：5

共 43 条

[1] THEORETICAL TREATMENT OF SODIUM-CHLORIDE CLUSTERS [J].

AHLRICHS, R ;

OCHSENFELD, C .

BERICHTE DER BUNSEN-GESELLSCHAFT-PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 1992, 96 (09) :1287-1294

[2]

Barlak T. M., 1983, Journal of Physical Chemistry, V87, P3441, DOI 10.1021/j100241a018

[3] SECONDARY ION MASS-SPECTROMETRY OF METAL-HALIDES .2. EVIDENCE FOR STRUCTURE IN ALKALI IODIDE CLUSTERS [J].

BARLAK, TM ;

WYATT, JR ;

COLTON, RJ ;

DECORPO, JJ ;

CAMPANA, JE .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1982, 104 (05) :1212-1215

[4] IMPACT-INDUCED CLEAVING AND MELTING OF ALKALI-HALIDE NANOCRYSTALS [J].

BECK, RD ;

STJOHN, P ;

HOMER, ML ;

WHETTEN, RL .

SCIENCE, 1991, 253 (5022) :879-883

[5] DEMETALLIZATION OF ALKALI ALKALI-HALIDE CLUSTERS - IMPACT-INDUCED FRAGMENTATION OF CUBIC NA-14F-12+ [J].

BECK, RD ;

STJOHN, P ;

HOMER, ML ;

WHETTEN, RL .

CHEMICAL PHYSICS LETTERS, 1991, 187 (1-2) :122-128

[6]

BLANDER M, 1979, ALKALI HALIDE VAP, P8

[7] EXPERIMENTAL AND THEORETICAL-STUDIES OF THE STRUCTURE OF ALKALI-HALIDE CLUSTERS [J].

BLOOMFIELD, LA ;

CONOVER, CWS ;

YANG, YA ;

TWU, YJ ;

PHILLIPS, NG .

ZEITSCHRIFT FUR PHYSIK D-ATOMS MOLECULES AND CLUSTERS, 1991, 20 (1-4) :93-96

[8]

Born M., 1956, DYNAMICAL THEORY CRY

[9] LOCALIZATION IN SMALL FCC-PARTICLES WITH SURFACE IRREGULARITIES AND DISORDER [J].

BUCHER, JP ;

BLOOMFIELD, LA .

ZEITSCHRIFT FUR PHYSIK D-ATOMS MOLECULES AND CLUSTERS, 1991, 20 (1-4) :361-363

[10] EFFECT OF CLUSTER SURFACE ENERGIES ON SECONDARY-ION-INTENSITY DISTRIBUTIONS FROM IONIC-CRYSTALS [J].

CAMPANA, JE ;

BARLAK, TM ;

COLTON, RJ ;

DECORPO, JJ ;

WYATT, JR ;

DUNLAP, BI .

PHYSICAL REVIEW LETTERS, 1981, 47 (15) :1046-1049

← 1 2 3 4 5 →