Reaction with atomic argon

Two colorimetric methods are recommended for boron analysis. One is the curcumin method, where the sample is acidified and evaporated after addition of curcumin reagent. A red product called rosocyanine remains it is dissolved in 95 wt % ethanol and measured photometrically. Nitrate concentrations >20 mg/L interfere with this method. Another colorimetric method is based upon the reaction between boron and carminic acid in concentrated sulfuric acid to form a bluish-red or blue product. Boron concentrations can also be deterrnined by atomic absorption spectroscopy with a nitrous oxide—acetjiene flame or graphite furnace. Atomic emission with an argon plasma source can also be used for boron measurement. 

Fig, 37. Far-infrared spectra of chromium, iron, and cobalt atom reactions with benzene, benzene-(f and benzene/benzene-d mixtures in argon matrices at 10-12K 171). 

Milligan and Jacox 44 have recently reported an elegant synthesis of CF2 in an argon matrix. Carbon atoms, produced from the photolysis of cyanogen azide, were allowed to react with molecular fluorine, and the presence of CF2 was demonstrated from infrared spectra. Use of radiation effective in photolyzing F2 produced CF3 from the reaction of the CF2 with atomic fluorine. 

Results from initial ion trap ICP-MS experiments indicated that signals due to argon ions and many polyatomic ions were much smaller than expected [133]. Reactions between Ar+ and H2 result in formation of low-mass ions such as H+ and H3+ and Ar atoms [148,149]. Ar-containing polyatomic ions, such as ArO+, ArOH+, ArCl+, Ar0+, and ArC+, can also be removed by reaction with H2 or water vapor in a reaction cell [115,148,149]. Other gases, such as oxygen, may be useful reagents to remove other molecular ions. 

E. Vietzke, K. Flaskamp, V. Philipps Hydrogen formation in the reaction of atomic hydrogen with pyrolytic graphite and the synergistic effect of argon ion bombardment. J. Nucl. Mater. 111-112, 763 (1982)... 

Methfune Is reported t-o react with photoexclted nickel atoms in Ar matrices to give MeNiH. A FTIR matrix Isolation study of the reactions of atomic and diatomic nickel in solid argon indicates that at very low concentrations of the metal, the nickel atom forms a ir-con lex with the triple bond of the acetylene.Photorearrangement of this complex gives nickel vinylidene, NiCCH2>... 

In this reaction, Na atoms lose one electron each to form Na+ ions, which contain only ten electrons, the same number as the preceding noble gas, neon. We say that sodium ions have the neon electronic structure Na+ is isoelectronic with Ne (Section 6-5). In contrast. Cl atoms gain one electron each to form Cl ions, which contain 18 electrons. This is the same number as the following noble gas, argon Cl is isoelectronic with Ar. These processes can be represented compactly as... 

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