ABSTRACT Recent analyses of nebular spectra have resulted in discrepant abundances from CNO forbidden and recombination lines. We consider independent methods of determining ion abundances for ...

Transitions between different electronic energy levels in elements occur at unique energies and intensities, giving each element a distinctive emission spectrum. When the energy of an incident photon ...

Optical Emission Spectroscopy (OES) is a widely used analytical technique used to determine the elemental composition of a broad range of metals. It is an extremely time-efficient and accurate method ...

An extensive review is given of the observations of absorption in the spectra of QSOs and BL Lac objects. In Table la we summarize all of the information available up to 1978 May 1 on objects which ...

Salt slurries in petri dishes with methanol are ignited and characteristic colors for various metals are observed. Colors of emission spectra are due to loosely-bound valence electrons being excited ...

In a new publication from Opto-Electronic Advances; DOI 10.29026/oea.2022.210036, authors from the Laser Engineering Group in the School of Engineering at the University of Liverpool, Liverpool, ...