Two-dimensional optogalvanic spectroscopy

In this work, the time domain of optogalvanic signal is considered as an extra dimension for the analysis of the optogalvanic spectra. A time window was used to integrate over the different time regions of the temporal OG signals for each wavelength. The method enhanced the resolution of spectra considerably so that two closed transitions, which differ only by 4 pm, were precisely separated. In addition a new transition of Neon around 640 nm masked by a transition at 640.229 nm was observed and assigned using the new method.

► We propose a method to enhance the resolution of optogalvanic (OG) spectra. ► It is based on consecutive step by step integration of the time resolved OG signals. ► It adds an extra dimension of integration time to the conventional OG spectra. ► Two transitions of Ne (667.827-667.832 nm), which differ only by 4 pm, were well resolved. ► Such high resolution is higher than our instrumentation resolving power.