Enhanced broadband ultrafast detection of ultraviolet emission using optical Kerr gating

2014 ◽  
Vol 85 (5) ◽  
pp. 055114 ◽  
Author(s):  
Kannatassen Appavoo ◽  
Matthew Y. Sfeir
Keyword(s):  
Ultraviolet Emission ◽  
Ultrafast Detection

scholarly journals Monte Carlo simulations of fast Newtonian and mildly relativistic shock breakout from a stellar wind

2020 ◽  
Vol 499 (4) ◽  
pp. 4961-4971
Author(s):  
Hirotaka Ito ◽  
Amir Levinson ◽  
Ehud Nakar
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Stellar Wind ◽  
Compact Star ◽  
Strong Dependence ◽  
Shock Velocity ◽  
Light Curves ◽  
Ultraviolet Emission ◽  
Relativistic Shocks ◽  
Strong Explosion

ABSTRACT Strong explosion of a compact star surrounded by a thick stellar wind drives a fast (>0.1c) radiation mediated shock (RMS) that propagates in the wind, and ultimately breaks out gradually once photons start escaping from the shock transition layer. In exceptionally strong or aspherical explosions, the shock velocity may even be relativistic. The properties of the breakout signal depend on the dynamics and structure of the shock during the breakout phase. Here we present, for the first time, spectra and light curves of the breakout emission of fast Newtonian and mildly relativistic shocks, that were calculated using self-consistent Monte Carlo simulations of finite RMS with radiative losses. We find a strong dependence of the νFν peak on shock velocity, ranging from ∼1 keV for vs/c = 0.1 to ∼100 keV for vs/c = 0.5, with a shift to lower energies as losses increase. For all cases studied the spectrum below the peak exhibits a nearly flat component (Fν ∼ ν0) that extends down to the break frequency below which absorption becomes important. This implies much bright optical/ultraviolet emission than hitherto expected. The computed light curves show a gradual rise over tens to hundreds of seconds for representative conditions. The application to SN 2008D/XRT 080109 and the detectability limits are also discussed. We predict a detection rate of about one per year with eROSITA.

High-resolution far ultraviolet emission spectra of electron-excited molecular deuterium

1999 ◽  
Vol 32 (15) ◽  
pp. 3813-3838 ◽  
Author(s):  
H Abgrall ◽  
E Roueff ◽  
Xianming Liu ◽  
D E Shemansky ◽  
G K James
Keyword(s):  
High Resolution ◽  
Emission Spectra ◽  
Ultraviolet Emission ◽  
Far Ultraviolet

Notizen:Phosphorescence Decay in Thallium-Doped Ammonium Chloride

1978 ◽  
Vol 33 (10) ◽  
pp. 1241-1242 ◽  
Author(s):  
S. Chaudhari ◽  
T. R. Joshi ◽  
R. V. Joshi
Keyword(s):  
Aqueous Solution ◽  
Ammonium Chloride ◽  
Mechanical Treatment ◽  
Room Temperature ◽  
Host Lattice ◽  
Luminescence Decay ◽  
Decay Rates ◽  
Negative Ion ◽  
Ultraviolet Emission ◽  
Near Ultraviolet

Abstract The phosphorescence decay rates of thallium-doped ammonium chloride (NH4Cl:Tl) phosphors, prepared by crystallization from aqueous solution, have been studied at room temperature for near-ultraviolet emission. The effects of impurity concentration as well as thermal and/or mechanical treatment on the decay rates have been examined. Phosphorescence centres consisting of a Tl+ion and a nearby negative ion vacancy are suggested to be responsible for the observed luminescence decay. The changes in the decay characteristics after pretreatments are explained on the basis of the location of the centres in normal and distorted regions of the host lattice.

scholarly journals Ultraviolet emission from a ZnO rod homojunction light-emitting diode

2009 ◽  
Vol 95 (13) ◽  
pp. 133124 ◽  
Author(s):  
X. W. Sun ◽  
B. Ling ◽  
J. L. Zhao ◽  
S. T. Tan ◽  
Y. Yang ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Ultraviolet Emission ◽  
Light Emitting

Enhancement of extreme ultraviolet emission from a CO2 laser-produced Sn plasma using a cavity target

2007 ◽  
Vol 91 (23) ◽  
pp. 231501 ◽  
Author(s):  
Yoshifumi Ueno ◽  
Georg Soumagne ◽  
Akira Sumitani ◽  
Akira Endo ◽  
Takeshi Higashiguchi
Keyword(s):  
Co2 Laser ◽  
Extreme Ultraviolet ◽  
Ultraviolet Emission

Diffuse Extreme-Ultraviolet Emission from the Coma Cluster: Evidence for Rapidly Cooling Gases at Submegakelvin Temperatures

Science ◽  
1996 ◽  
Vol 274 (5291) ◽  
pp. 1335-1338 ◽  
Author(s):  
R. Lieu ◽  
J. P. D. Mittaz ◽  
S. Bowyer ◽  
J. O. Breen ◽  
F. J. Lockman ◽  
...  
Keyword(s):  
Extreme Ultraviolet ◽  
Coma Cluster ◽  
Ultraviolet Emission

A study of the correlation between nickel and the ultraviolet emission in SiOx films

2005 ◽  
Vol 281 (2-4) ◽  
pp. 318-322 ◽  
Author(s):  
Y. He ◽  
J.Y. Feng ◽  
Q.L. Wu
Keyword(s):  
Ultraviolet Emission
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