Noble gas mixture

Kistemaker P. G., de Vries A. E. Rotational relaxation times in nitrogen-noble-gas mixtures, Chem. Phys. 7, 371-82 (1975). 

A. A. Kudryavtsev and M. V. Tonkov. Invariance of translational band conturs in induced spectra of noble gas mixtures. Opt. Spectrosc. 

Analyzing the data on molecular gases irradiated by vacuum UV emission,60 Platzman2 has noted that for certain gases the probability of ionization 77 (Eph) is smaller than unity when Eph exceeds Ix by 10 eV or more. This was confirmed in his subsequent study of molecule-noble-gas mixture,61 done in collaboration with Jesse. They have also observed an isotopic effect the substitution of deuterium for hydrogen increases the ionization probability. Platzman thus concluded that in such discrete states with E>lx the predissociation efficiently competes with autoionization. Platzman has named them the superexcitation states (SES). The SES were discussed in a special issue of Radiation Research62 (see also Refs. 25 and 63). 

Hiyagon and Ozima (1986) employed a laboratory approach of measuring crystal-melt partition coefficients. They measured noble gas concentration in olivine crystals and basalt melts, which were synthesized at 1370-1300°C under an atmospheric pressure, and also at 1360-1050°C under high pressure (0.2-1.5 GPa), of noble gas mixture. From these experimental results, they obtained ranges for noble gas partition coefficients XHe = 0.07, XNe = 0.006-0.08, KM = 0.05-0.15, KXe = 0.3. These partition coefficients are much larger than the values obtained by Marty and Lussiez (1993) and also these of common incompatible elements such as U (-0.002) or K (0.0002 - 0.008) between olivine and basalt melt (e.g. Henderson, 1982). 

First it should be noted that most of the experimental work on infrared absorption of gas mixtures has been restricted to cases where the constituent molecules themselves are not infrared active, Much work has for instance been done on mixtures of noble gases and noble gases with H2 . Noble gas mixtures show a broad band centered around 100 cm . This is due to absorption by the translational motion of two unlike atoms relative to their joint center of mass. The same kind of translational band has also been measured in Hj-noble gas mixtures and pure H2 . ... 

Constituent 1 is usually assumed to be molecular hydrogen. Constituent 2 is taken to be a multicomponent noble gas mixture—excluding He, which is only weakly bound in terrestrial planet atmospheres and escapes readily by other processes. The diffusion parameter b in Equation (3), and thus the crossover mass me, differs for different elements S in constituent 2. If mc(S) is known (or assumed) for one element, say Xe, then Equation (3) for both Xe and S yields... 

He/ Ne)crust and (" He/ Ne)mnti are the " He/ Ne ratio of the crust and mantle components before mixing respectively. Further examples of isotope mixing relationships and three-dimensional approaches when resolving three components from the isotope systematics are detailed in the section Description and analysis of multi-component noble gas mixtures in ore fluids. 

Description and analysis of multi-component noble gas mixtures in ore fluids... 

There has been considerable interest in the possibility of bound excited states arising from the interaction of unMe noble gas atoms. Jortner and co-workers have searched for second continue in radiolysis studies of noble gas mixtures in the solid and liquid phase and at pressures of the order of 1000 mmHg (1 mm Hg = 133 Nm" ) in the gas phase. In general, emission from the homo-nuclear molecules is favoured even for the minor component, but weak continua have been ascribed to ArKr and KrXe. These states are postulated to correlate with the excited state of the heavier atom and their weaker bonding relative to homonuclear molecules is clear from comparison of the wavelengths corresponding to peak intensity of the continua ... 

Chinese researchers have reported lasing in noble gas mixtures excited by a fast-burst reactor, but have not followed up this work with publications in English. Japanese workers have investigated the usefulness of the 0.585-)um RPL line as a diagnostic for neutron flux in nuclear reactors (Yamanaka, 1997). 

A. Sasso, G.M. Tino, M. Inguscio, N. Beverini, M. Francesconi Investigations of collisional line shapes of neon transitions in noble gas mixtures. Nuov. Ci-mento D 10, 941 (1988)... 

As will be seen below, we obtained similar and sometimes even better results with carbon layers. It is well known that so-called isotropic carbon is especially compatible with blood /7/. It is deposited as pyrolytic carbon in a fluidized bed of a hydrocarbon-noble gas mixture at relatively low pyrolysis temperatures between 1200 and 1500 C (LT = low temperature). Since this process can on ly be used with a heat-stable substrate material with low thermal expansion coefficients, we (and others /8/) used vacuum-coating processes for the deposition of similar coatings onto polymers. In our work we used two processes with one, the results of which will be reported in sect. 5, the carbon is separated out of a hydrocarbon-noble gas mixture in the set-up shown in Fig.2. However, not heat, as in pyrolysis, but rather a glow discharge is used for the decomposition. 

In the thermal decomposition of N2H4 in shock waves, NH(X) is formed in secondary reactions [20]. In shock-heated NH3-noble gas mixtures at high temperatures (T>3000 K) [37 to 39] and in a high-temperature plasma (T = 3200 K), emission from NH(A) was observed [40]. At lower temperatures in shock waves NH(X) was observed [41]. HN3 and HNCO can be pyrolyzed at significantly lower temperatures (T> 1200 K) under these conditions mainly NH(X) is formed [44, 45]. 

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