In the low density intergalactic medium (IGM) that gives rise to the Lyman-α forest, gas temperature and density are tightly correlated. The velocity scale of thermal broadening and the Hubble flow across the gas Jeans scale are of similar magnitude (HλJ ∼ σth). To separate the effects of gas pressure support and thermal broadening on the Lyα forest, we compare spectra extracted from two smooth...

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2014 We show that the pressure broadening of the width 2 ~(4 V2 + (01270393)2) of an anticrossing signal (where V is the coupling between the anticrossing levels and 0393 the reciprocal of their lifetime) is caused by more than just the increase of 0393 by collisions. We find that the linewidth is given by 2 ~(4 V2 ab03B3/03B3 + (0127 ab03B3)2), where ab03B3/03B3 is the ratio of the effective r...

2 Radiation and Atoms 1 2.1 Width and Shape of Spectral Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2.1.1 Lifetime Broadening . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2.1.2 Collision or Pressure Broadening . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.1.3 Doppler Broadening . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....

Calculations of self-broadened half-widths and self-induced pressure shifts are made using the complex Robert–Bonamy formalism. The results of calculations using different approximations of the intermolecular potential indicate that this is a strong collision system. The effects of the imaginary components on the half-widths are studied. The temperature, vibrational, and rotational state depend...

The study goal was to use membrane voltage changes during neurohypophysial action potential (AP) propagation as an index of nerve function to evaluate the role that circulating microparticles (MPs) play in causing central nervous system injury in response to decompression stress in a murine model. Mice studied 1 h following decompression from 790 kPa air pressure for 2 h exhibit a 45% broadenin...