Influence of interchannel interactions upon the characteristics of a “two-particle-two-hole”-type resonance in the neon atom
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Particle (ecology)
Ionization out of metastable states can dominate the total electron-impact ionization rate for many atomic systems. However, there have been few advanced close-coupling calculations of ionization of metastable atoms. In this paper, we report on an R-matrix with pseudostates (RMPS) calculation of ionization from the 2p53s3P term of neon. Within the experimental systematic uncertainties, our RMPS cross section is in agreement with the measurements by Johnston et al (1996 J. Phys. B: At. Mol. Opt. Phys. 29 531) for ionization from the 3P0 and 3P2 metastable levels. In addition, we have carried out a configuration-average time-dependent close-coupling (TDCC) calculation of ionization from the 2p53s configuration of neon and we find that the TDCC results agree well with RMPS cross sections, further supporting the accuracy of these advanced close-coupling methods. Finally, we have performed a distorted-wave calculation of the ionization cross section of metastable neon, and by comparing it with the RMPS results, we assess the effects of inter-channel coupling on this cross section.
Metastability
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Helmholtz free energy
Vapor–liquid equilibrium
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The desorption behavior of quench-condensed rare gas films has been investigated using high frequency surface acoustic waves. Measurements of pure films of argon and neon and of the binary mixture Ar(1-c)/Ne(c) have been carried out. For small and very large neon concentration c(Ne) a behavior is found which indicates the existence of a substitutionally disordered solid. In contrast, in the wide range of concentration 0.25< c(Ne)< 0.92 two discrete temperatures for neon desorption exist. The data clearly indicate the occurrence of two separate phases, one of pure neon, the other of crystallites with either Ar(2)Ne or Ar(3)Ne structure.
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The ratios of the cross-section of the transfer ionization to the single electron capture of Neon induced by F 2+ and F 3+ ions are measured by means of the time-of-flight technologie. In the present energy range, the transfer ionization C1I1 of neon can be considered as a two-step process, in which one electron is captured by projectile and another one is directly ionized, and the transfer ionization C1I2 process should be considered as a subsequent rearrangement of neon following a transfer ionization C1I1 process. A qualitative interpretation is presented.
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Clathrate hydrate
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The excitation functions of the ~(23)Na(p,α_0)~(20)Ne_(g·s).and the ~(23)Na(p,α_1)~(20)Ne_(?) reae-tion have been measured from E_p=1 to 2.5 MeV at θ_L=30°,150° and 30°,respectively.Around the resonance at 2.171 MeV,the excitation functions of the(p,α_0)reactionhave been measured at 12 angles,then,some angular distributions have been obtainedfrom these excitation functions.In addition,the angular distribution of the(p,α_0)reaction for the resonance at 2.171 MeV has also been measured directly at energy ofthe resonance peak of the excitation function at 150°.For the resonance at 2.117MeV,the angular distribution have been measured at two energies,one at the energyof the resonance peak of the excitation function at 150°,another at the energy of thehalf maximum point of the resonance peak on the higher energy side.Around the re-sonance at 2.075 MeV,the excitation functions have been measured at 16 angles,andthe angular distribution has been obtained from three excitation functions.The an-gular distributions of the three resonances are not symmetric about 90°,and the posi-tions of the resonance peaks of these resonances varies with the angle of measurement.By means of the compound nucleus theory,discussions have been made for these non-solated resonances.
Excitation function
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The effectiveness of cataphoretic purification of neon was investigated in conjunction with work on breakdown potentials in neon below the Paschen minimum. The extreme sensitivity, resulting from the Penning effect, of the breakdown potential in neon to the presence of traces of argon was used as an indicator of the degree of purity of the neon. Under the conditions of this experiment the limit of sensitivity for argon was about 1:107. With a discharge current of 125 mA in a helically wound Pyrex tube 1.6-cm o.d. and 2 m long, original concentrations of argon in neon of 50 ppm and 2%±1% were decreased to ≤0.1 and ≤1 ppm, respectively.
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