Comparison of the polarisation of line and continuum emission in a laser produced plasma

23rd International Conference on Spectral Line Shapes

Wubetu, G.A.^1,2 ; Kelly, T.J.^3 ; Van Kampen, P.^1 ; Fiedorowicz, H.^2 ; Bartnik, A.^2 ; Wachulak, P.^2 ; Skrzeczanowski, W.^2 ; Costello, J.T.^1

NCPST and School of Physical Science, Dublin City University, Glasnevin, Dublin 9, Ireland^1

Institute of Optoelectronics, Military University of Technology (MUT), Kaliskiego 2 Str. 00-908, Warsaw, Poland^2

School of Mathematics and Physical Sciences, University of Hull, Hull

HU67RX, United Kingdom^3

关键词: Aluminium plasmas;    Anisotropic emission;    Continuum emission;    Degree of polarisation;    Line emissions;    Radiative recombination;    Time-resolved;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/810/1/012063/pdf
DOI  :  10.1088/1742-6596/810/1/012063

来源: IOP

【 摘 要 】

Anisotropic emission from a laser-produced aluminium plasma emission has been studied using time and polarisation resolved spectroscopy. The time-resolved degree of polarisation of emission from a bound - bound transition in Al+(466.3 nm) was compared to the time-resolved degree of polarisation from nearby continuum emission. The results are interpreted in the framework of radiative recombination and statistical imbalances in the populations of magnetic sub-states. It is found that the continuum emission is more strongly polarised than the line emission. Thus, this technique is a valid alternative to gated LIBS.