ABSORPTION SPECTRA IN CONCENTRATED SULFURIC ACID

1963 ◽  
pp. 321-448 ◽  
Author(s):  
LELAND L. SMITH ◽  
SEYMOUR BERNSTEIN
Keyword(s):  
Sulfuric Acid ◽  
Absorption Spectra ◽  
Concentrated Sulfuric Acid

Absorption spectra of solutions of tetraphenylporphin and its derivatives in concentrated sulfuric acid

1984 ◽  
Vol 41 (3) ◽  
pp. 1040-1043
Author(s):  
B. G. Gnedin ◽  
M. V. Shchukina ◽  
V. V. Morozov ◽  
B. D. Berezin ◽  
A. S. Semeikin
Keyword(s):  
Sulfuric Acid ◽  
Absorption Spectra ◽  
Concentrated Sulfuric Acid

Gallium Arsenide Integrated Circuits Decapsulation Technique Using Mixed Acid Chemistry For Die-Level Failure Analysis

2018 ◽  
Author(s):  
Harold Jeffrey M. Consigo ◽  
Ricardo S. Calanog ◽  
Melissa O. Caseria
Keyword(s):  
Gallium Arsenide ◽  
Sulfuric Acid ◽  
Nitric Acid ◽  
Integrated Circuits ◽  
Failure Analysis ◽  
Mixed Acid ◽  
Optimum Parameters ◽  
Plastic Package ◽  
Fuming Nitric Acid ◽  
Concentrated Sulfuric Acid

Abstract Gallium Arsenide (GaAs) integrated circuits have become popular these days with superior speed/power products that permit the development of systems that otherwise would have made it impossible or impractical to construct using silicon semiconductors. However, failure analysis remains to be very challenging as GaAs material is easily dissolved when it is reacted with fuming nitric acid used during standard decapsulation process. By utilizing enhanced chemical decapsulation technique with mixture of fuming nitric acid and concentrated sulfuric acid at a low temperature backed with statistical analysis, successful plastic package decapsulation happens to be reproducible mainly for die level failure analysis purposes. The paper aims to develop a chemical decapsulation process with optimum parameters needed to successfully decapsulate plastic molded GaAs integrated circuits for die level failure analysis.

PRODUCTION OF SULFOCATIONITE BY MODIFICATION OF NATURAL COAL WITH CONCENTRATED SULFURIC ACID

2020 ◽  
Vol 3 (441) ◽  
pp. 104-109
Author(s):  
N.A. Bektenov ◽  
◽  
N.C. Murzakassymova ◽  
M.A. Gavrilenko ◽  
А.N. Nurlybayeva ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Concentrated Sulfuric Acid ◽  
Natural Coal
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