Topic
Amagat
About: Amagat is a research topic. Over the lifetime, 294 publications have been published within this topic receiving 5807 citations. The topic is also known as: amg.
Papers published on a yearly basis
1 / 2
Papers
TL;DR: In this article, the linear density coefficient of chemical shielding for pure xenon over the temperature range 240-440 °K was obtained and the experimental values of σ1(τ) can be fitted by a fourth degree polynomial.
Abstract: Studies of density dependence of 129Xe chemical shift in xenon gas at room temperature have shown that while the chemical shielding does have quadratic and cubic dependence on density over densities up to 250 amagat, σ(ρ, T) = σ0 + σ1(T)ρ + σ2(T)ρ2 + σ3(T)ρ3, the curve is essentially linear up to about 100 amagat. We have now obtained σ1(T), the linear density coefficient of chemical shielding, for pure xenon over the temperature range 240–440 °K. The experimental values of σ1(T) can be fitted by a fourth degree polynomial: σ1(τ) = 0.536 − 0.135 × 10−2τ + 0.132 × 10−4 τ2 − 0.598 × 10−7τ3 + 0.663 × 10−10τ4 (ppm/amagat), where τ = T − 300 °K. Comparison is made with σ1(T) for other nuclei and with σ1(T) predicted by various theoretical models.
161 citations
TL;DR: In this article, the compressibility of neon at temperatures from 0°C up to 150°C and densities up to 1100 Amagat, with the maximum pressure being about 2900 atmospheres.
158 citations
TL;DR: The null gap region of the fundamental band of pure HCl has been studied in the case where argon and xenon are used as perturbing gases as discussed by the authors, and it has been found that the complex features previously observed in the spectrum at room temperature were greatly enhanced in intensity at the lowest temperature.
Abstract: The null gap region of the fundamental band of HCl has been studied in the case where argon and xenon are used as perturbing gases. The experiments were performed using an absorption cell of 150 cm length. The absorption cell could be varied in temperature from room temperature to 195°K. The complex features previously observed in the spectrum at room temperature were greatly enhanced in intensity at the lowest temperature. The absorption spectrum of pure HCl gas was found to show strong evidence for dimer formation, which feature becomes strikingly evident at the lowest temperature employed. ``Arrhenius'' plots were made of the HCl–Ar, HCl–Xe, and the dimer data. The heats of formation were found to be 1.1, 1.6, and 2.14 kcal/mole, respectively, with a probable error of ±0.2 kcal/mole. The concentration of the dimer is estimated to be 1 part in 50 000 at 195°K at a gas density of 0.36 amagat.
118 citations
TL;DR: The self-diffusion coefficient D of methane has been measured over a wide range of temperature and density, using the spin-echo technique as mentioned in this paper, and the results are in almost quantitative agreement with the theoretical zero-order density approximation.
117 citations
TL;DR: In measurements up to 27 amagat, non-Lorentzian, asymmetric features are observed in Raman {ital Q}-branch transitions of H{sub 2} dilute in a heavy perturber gas.
Abstract: We report observations of inhomogeneous broadening in the vibrational line profiles of a gas in the impact'' density regime. In measurements up to 27 amagat (where the spectra are dominated by collision broadening), non-Lorentzian, asymmetric features are observed in Raman {ital Q}-branch transitions of H{sub 2} dilute in a heavy perturber gas. We compare these measurements with an inhomogeneous line-profile model based on collisional shifts that strongly depend on the (thermal) speed of the H{sub 2} radiator. Quantitative agreement is obtained only when speed-changing collisions are considered, which result in spectral line narrowing.
112 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2019 | 3 |
| 2018 | 1 |
| 2017 | 2 |
| 2016 | 3 |
| 2015 | 1 |
| 2014 | 1 |