New set of experimental wavenumber values for visible part of emission spectrum ($545 \div 627$ nm) of the $D_2$ molecule with partly resolved fine structure of triplet-triplet rovibronic transitions

TL;DR

This paper presents new, highly precise wavenumber measurements of the D2 molecule's emission spectrum in the visible range, revealing for the first time partly resolved fine structure of its spectral lines.

Contribution

It provides a new set of experimental wavenumber values with high precision and reports the first observation of partly resolved fine structure in the visible spectrum of D2.

Findings

New wavenumber values with 0.007-0.1 cm$^{-1}$ precision.

First observation of partly resolved fine structure in D2 visible spectrum.

Enhanced understanding of D2 spectral line structure.

Abstract

New set of wavenumber values for electronic-vibro-rotational (rovibronic) transitions in limited part of the emission spectrum of the $D_2$ molecule ($545 \div 627$ nm) have been measured with a precision $0.007 \div 0.1$ cm$^{-1}$ depending on the translational temperature in plasma, the signal-to-noise ratio, and the degree of overlap with adjacent spectral lines. For the first time partly resolved fine structure of the $D_2$ spectral lines has been observed in the visible part of the spectrum.