Argon matrix exposures

Araon Matrix Exposures. We have chosen the system COj in argon for its simplicity. The chemical changes induced by the electron beam were determined by following the changes in infrared spectra as a function of incident charge density. The net effect of the electron beam exposure is the conversion of COj to CO as shown below ... 

The poor stability on exposure to air and water, particularly at elevated temperatures, which results in a reduction in conductivity, also poses problems. In the case of polypyrrole it has been found that conductivity can, however, be maintained either by the drastic measure of storing under the protective layer of the inert gas argon or embedding polypyrrole film in a matrix of an epoxide resin-glass-fibre composite. 

The sample molecules can be ionised by one of several techniques. In electron impact ionisation, (El), electrons are fired at the sample molecules, whereas in chemical ionisation, (Cl), the sample molecules are collided with a reactive gas. The sample can also be bombarded with argon atoms (fast atom bombardment, FAB) or the dissolved sample can be sprayed into an electric field electrospray ionisation, ESI). Furthermore, the sample can be co-crystallised with a matrix and then ions can be generated by exposure to photons (matrix assisted laser desorption ionisation, MALDI). 

Cheng HM, Akiyama S, Kitahara A, Kobayashi K, Zhou BL, Behaviour of carbon-fiber reinforced Al-Si composites after thermal exposure. Mater Sci Technol, 8(3), 275-281, 1992. Friler JB, Argon AS, Cornie JA, Strength and toughness of carbon fiber reinforced aluminum matrix composites. Mater Sci Eng A—Structural Materials Properties Microstructure and... 

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