Recent studies in electrospray ionization (ESI)/ion mobility spectrometry (IMS) have focussed on employing different drift gases to alter separation efficiency for some molecules. This study investigates four structurally similar classes of molecules (cocaine and metabolites, amphetamines, benzodiazepines, and small peptides) to determine the effect of structure on relative mobility changes in ...

The oxidative and nonoxidative conversion of ethylene in a dielectric barrier discharge the presence water with formation predominantly unsaturated compounds (acetylene, butene, butadiene) has been studied. efficiency argon is shown comparison its oxidation by air into oxygenates. A simple theoretical estimate energy loss electrons feed gas mixture kinetic calculations make it possible to expla...

Low secondary ion yields from organic and biological molecules are the principal limitation on the future exploitation of time of flight-secondary ion mass spectrometry (TOF-SIMS) as a surface and materials analysis technique. On the basis of the hypothesis that increasing the density of water related fragments in the ion impact zone would enhance proton mediated reactions, a prototype water cl...

Argon-ion etching and various other chemical etchants were applied to conventional and gold-containing dental alloys and amalgams. The polished and etched specimens were studied by optical and/or electron optical methods and by energy-dispersive x-ray spectroscopy. Chemical etchants, though effective, have the disadvantage of accentuating surface scratches. This, in turn, causes difficulty in t...

port wine stains are benign but cosmetically devasting congenital angiomas. the argon laser is a therapeutic device newly applied to this condition. our program was begun 6 years ago. from the beginning, the study was conceived as a clinical investigation of both the port wine stain and its argon laser therapy. a total of 218 patients with port wine stains have been studied and many aspects of ...

UNLABELLED Hypothermia is ineffective in 45% of neonates with hypoxic-ischemic encephalopathy. Xenon has additive neuroprotective properties, but is expensive, and its application complicated. Argon gas is cheaper, easier to apply, and also has neuroprotective properties in experimental settings. The aim was to explore the safety of argon ventilation in newborn piglets. METHODS Eight newborn ...

Argon is a noble gas in group 18 of the periodic table. Certificated to exist in air atmosphere merely one century ago, discovery of argon shows interesting stories of researching and exploring. It was assumed to have no chemical activity. However, argon indeed present its biological effect on mammals. Narcotic effect of argon in diving operation and neur-protective function of argon in cerebra...

While the archetypal free phosphinidene, H-P, has been studied for over a century, reports on uncomplexed, univalent phosphorus compounds are very sparse. Here we demonstrate production of HCCP in solid argon through UV-induced rearrangement and subsequent dehydrogenation phosphapropyne, CH3CP. Migration H atoms along CCP backbone CH3CP resulted previously unobserved species 1-phosphapropadiene...