We calculate the synchrotron self-Compton emission from internal shocks occurring in relativistic winds as a source of gamma-ray bursts, with allowance for self-absorption. For plausible model parameters most pulses within a Gamma-Ray Burst (GRB) are optically thick to synchrotron self-absorption at the frequency at which most electrons radiate. Up-scattering of photon number spectra harder tha...

X-ray emission spectra recorded in the off-resonant regime carry information on the density of unoccupied states. It is known that by employing the Kramers-Heisenberg formalism, the high energy resolution off-resonant spectroscopy (HEROS) is equivalent to the x-ray absorption spectroscopy (XAS) technique and provides the same electronic state information. Moreover, in the present Letter we demo...

Effects of finite-temperature quasiparticle self-energy corrections on x-ray absorption spectra are investigated within the local density $GW$ approximation up to temperatures $T$ order Fermi temperature. To facilitate calculations, we parametrize using low-order polynomial fits. We show that temperature-driven decrease in electron lifetime substantially broadens near-edge region with increasin...

2014 The first theoretical study of optical absorption in aluminium under hydraulic pressure, based on a self-consistent ab initio band scheme, is presented. The shifts of the absorption peaks under high pressure, in agreement with the experimental data, are observed The relevant changes in the band structures are pointed out to explain these shifts. J. Physique 47 (1986) 453-460 MARS 1986, :

SO2 scavenging and self-reaction of CH2OO were utilized for the decay of CH2OO to extract the absorption spectrum of CH2OO under bulk conditions. Absolute absorption cross sections of CH2OO at 308.4 and 351.8 nm were obtained from laser-depletion measurements in a jet-cooled molecular beam. The peak cross section is (1.23 ± 0.18) × 10(-17) cm(2) at 340 nm.