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Titolo:
DIFFUSE TRANSMITTANCE SPECTROSCOPY OF DIATOMIC AG NUCLEI ON AGBR MICROCRYSTALS
Autore:
OKU Y; KAWASAKI M;
Indirizzi:
KOBE UNIV,GRAD SCH ENGN,DEPT MOL ENGN KYOTO 6068501 JAPAN KOBE UNIV,GRAD SCH ENGN,DEPT MOL ENGN KYOTO 6068501 JAPAN
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 45, volume: 102, anno: 1998,
pagine: 9061 - 9069
SICI:
1089-5647(1998)102:45<9061:DTSODA>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
SIMPLE METAL-CLUSTERS; LATENT IMAGE; REDUCTION SENSITIZATION; SILVER CLUSTERS; MINIMUM SIZE; PHYSICS; CENTERS; GRAINS; MODEL; ATOM;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
27
Recensione:
Indirizzi per estratti:
Citazione:
Y. Oku e M. Kawasaki, "DIFFUSE TRANSMITTANCE SPECTROSCOPY OF DIATOMIC AG NUCLEI ON AGBR MICROCRYSTALS", JOURNAL OF PHYSICAL CHEMISTRY B, 102(45), 1998, pp. 9061-9069

Abstract

A diffuse transmittance spectroscopy method that utilizes a large area photodetector in contact with the sample is a simple and useful method to probe a weak light absorption by molecular species incorporated in a strongly scattering medium. The method successfully uncovered theelectronic transition centered at 455 nm involving what are identified as diatomic Ag nuclei (Ag-2), which were size-selectively formed on a 0.45 mu m octahedral AgBr microcrystal in a photographic emulsion ina surprisingly high density (many thousands on each microcrystal surface) through a heterogeneous chemical reduction. The estimated oscillator strength for the 455 nm absorption, 0.5 +/- 0.1, compares favorably to the theoretical prediction (0.64) reported for the lowest-energy electronic transition of an isolated Ag-2 molecule, which is known to be centered at 435 nm. A possible mechanism underlying the remarkable size selectivity in the chemistry of Ag-2 formation on AgBr is also discussed in conjunction with a hypothetical (111) surface structure of the octahedral AgBr grain.

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Documento generato il 22/01/20 alle ore 18:44:25