The fourteen kinds of pressure-transmitting media were evaluated by the ruby fluorescence method at room temperature, 77 K using the diamond anvil cell (DAC) up to 10 GPa in order to find appropriate media for use in low temperature physics. The investigated media are a 1:1 mixture by volume of Fluorinert FC-70 and FC-77, Daphne 7373 and 7474, NaCl, silicon oil (polydimethylsiloxane), Vaseline,...

A short overview of recent results on the effects of pressure (collisions) regarding the shape of isolated infrared lines of water vapour is presented. The first part of this study considers the basic collisional quantities, which are the pressure-broadening and -shifting coefficients, central parameters of the Lorentzian (and Voigt) profile and thus of any sophisticated line-shape model. Throu...

A tunable diode laser absorption spectroscopy (TDLAS)-based spectrometer employing a mid-infrared (Mid-IR) interband cascade (ICL) was developed and used to determine pressure broadening coefficients of two NO transitions at 1914.98 cm−1 1915.76 in the fundamental (1←0) band (R11.5 Ω1/2 Ω3/2) for CO2, N2, Ar, O2, He, H2. For first time, reliable consistent set six different pressure-broadening ...

We examine the impact of gas pressure on the transverse coherence of high-redshift (2 6 z 6 4) Lyman-α forest absorption along neighboring lines of sight that probe the gas Jeans scale (projected separation ∆rp 6 500h−1 kpc comoving; angular separation ∆θ . 30). We compare predictions from two smoothed particle hydrodynamics (SPH) simulations that have different photoionization heating rates an...

The effect of lateral pressure on the wavelength response characteristics of a fiber Bragg grating embedded in a cylindrical package of silicone rubber has been investigated in this report. Due to high Poisson’s ratio (0.48) and low stiffness of silicone rubber, force applied in one direction will be efficiently transferred to the perpendicular direction also. A wavelength shift of more than 1 ...

Measurements and analyses of space-time structure of random pressure fields and associated area-averaged loads acting on prismatic building models in simulated atmospheric flows are presented. The objective of this study is threefold: first, a broadening of our understanding of wind induced surface pressure fluctuations around buildings; second, gaining insight into the aerodynamics of prisms i...

Optical frequency comb-referenced measurements of self pressure-broadened line profiles the R(8) to R(13) lines in ?1 + ?3 combination band acetylene near 1.52 µm are reported. The analysis data found no evidence for a previously reported [Iwakuni et al., Phys. Rev. Lett. 117(14), 143902 (2016)] systematic alternation widths with nuclear spin state molecule. present work brought out need use an...