Effect of gas composition on the pressure dependence of helium solubility in vitreous silica

1976 ◽  
Vol 47 (9) ◽  
pp. 3952-3955 ◽  
Author(s):  
J. E. Shelby ◽  
S. C. Keeton ◽  
J. J. Iannucci
Keyword(s):  
Pressure Dependence ◽  
Vitreous Silica ◽  
Gas Composition

scholarly journals Depolarization Ratios of Methane Raman Bands as a Function of Pressure

Molecules ◽  
2020 ◽  
Vol 25 (8) ◽  
pp. 1951
Author(s):  
Dmitry Petrov
Keyword(s):  
Raman Spectroscopy ◽  
High Pressure ◽  
Natural Gas ◽  
Raman Spectra ◽  
Pressure Dependence ◽  
Pressure Range ◽  
Gas Composition ◽  
Depolarization Ratio ◽  
Depolarization Ratios

In this work, we measured the intensities of Q-branches of the ν1, ν2 and ν3 bands in the polarized and depolarized methane Raman spectra in the pressure range of 1–60 atm. It was established that the pressure dependence of depolarization ratios of the ν2 and ν3 bands are negligible. In turn, the depolarization ratio of the ν1 band increases with increasing pressure and reaches approximately 0.0045 at 60 atm. These data are more precise than previously published ones because ν1 band intensities were determined taking into account the contribution of overlapping lines of ν3 band. The presented data will be useful in calculating the methane polarizabilities at high pressure, as well as in calculating methane Raman spectra for measuring the natural gas composition using Raman spectroscopy.

ESEM - A multipurpose surface Electron Microscope

1986 ◽  
Vol 44 ◽  
pp. 632-633 ◽  
Author(s):  
G.D. Danilatos
Keyword(s):  
Electron Microscope ◽  
Room Temperature ◽  
Environmental Scanning ◽  
Gas Composition ◽  
Saturated Water Vapor ◽  
Surface Electron ◽  
Current State ◽  
Saturated Water ◽  
New Type ◽  
Temperature And Pressure

Over recent years a new type of electron microscope - the environmental scanning electron microscope (ESEM) - has been developed for the examination of specimen surfaces in the presence of gases. A detailed series of reports on the system has appeared elsewhere. A review summary of the current state and potential of the system is presented here.The gas composition, temperature and pressure can be varied in the specimen chamber of the ESEM. With air, the pressure can be up to one atmosphere (about 1000 mbar). Environments with fully saturated water vapor only at room temperature (20-30 mbar) can be easily maintained whilst liquid water or other solutions, together with uncoated specimens, can be imaged routinely during various applications.

On the pressure dependence of the thermodynamical scaling exponent γ

Soft Matter ◽  
2020 ◽  
Vol 16 (19) ◽  
pp. 4625-4631 ◽  
Author(s):  
R. Casalini ◽  
T. C. Ransom
Keyword(s):  
Pressure Dependence ◽  
Scaling Exponent ◽  
Scaling Parameter

In materials with a constant scaling parameter γS, the Isomorph γI is found to vary with pressure, demonstrating γS ≠ γI.

Sign in / Sign up

Export Citation Format

Share Document