Laser-plasma and stellar astrophysics spectroscopy

Abstract

This work examines time-resolved spectroscopy of the Balmer series lines in laboratory settings and applies results for interpretation of spectra from astrophysical objects. White dwarf stars reveal a variety of atomic or molecular line shapes in absorption depending on the age of these cooling stars. Laboratory investigations show emission profiles that are correlated with astrophysical records. For the hydrogen beta line, Hβ, and the hydrogen delta line, Hδ, of the Balmer series, line width and peak separation are indicators of electron density. In addition, widths of the hydrogen alpha line, Hα, and hydrogen gamma line, Hγ, can be utilized along with Hα shifts and Hβ dipshifts. Of interest are experiments and analysis of laser-and astrophysical white-dwarfplasma spectral line shapes, especially comparisons of transient laser-plasmawith gravitational white-dwarf-redshifts. Current and future research aspects include modeling of white-dwarf atmospheres for explanation of the very details of the astrophysical line shapes.

Measurements of Gaseous Hydrogen–Nitrogen Laser-Plasma

“…In this work, optical breakdown plasma is generated in a 1:1 hydrogen:nitrogen mixture at ambient temperature and 0.27-atm pressure. Plasma diagnosis is applied for time delays in the range of 0.25 µs to 3.25 µs [12,13]. Nitrogen contributes to the breakdown plasma seven times more electrons than hydrogen in cases of full ionization.…”

“…Applications of the reported work include analysis of stellar astrophysical spectra from white dwarf stars [13]. In the visible region of the electromagnetic spectrum, H β is of primary interest in the characterization of white dwarf (WD) stars.…”

Complex diagnostic and numerical study of x-ray and particle emissions under relativistic ultra-short laser-solid interaction

“…Such university-scale laboratory lasers have emerged as attractive tools among researchers particularly over the last few decades due to their exceptional potentials in numerous applications. They are being widely employed in laboratory astrophysics (Huang et al 2019, Parigger 2020, fast ignition in Inertial Confinement Fusion (ICF) (Roth et al 2001, Kemp et al 2014, medical therapy (Bulanov and Khoroshkov 2002, Ledingham et al 2007, Karsch 2017 and medical isotope production (Ma et al 2019), neutron radiography and tomography (Strobl et al 2009), charged particle production and acceleration (Macchi et al 2013, Yogo et al 2017, Higginson et al 2018, Rosmej et al 2019, x-ray and gamma ray production (Rousse et al 2004, Chang et al 2017, Rosmej et al 2019, and so forth.…”