Atlas and wavenumber tables for visible part of the rovibronic multiline emission spectrum of the $D_2$ molecule. I. Wavenumber range $23894 \div 18161$ cm$^{-1}$ measured with moderate resolution

TL;DR

This paper presents a detailed atlas of the visible emission spectrum of the D2 molecule, including wavenumber measurements and line assignments, obtained through spectral recording, deconvolution, and calibration.

Contribution

It provides a new set of accurately calibrated wavenumber values and line assignments for the D2 molecule's emission spectrum in the visible range.

Findings

Wavenumber values for 6545 spectral lines were determined.

The spectrum was divided into 36 sections with detailed images and data.

The spectral lines were properly calibrated and assigned.

Abstract

The visible part ($\approx 419 \div 550$ nm) of the multiline electronic-vibro-rotational emission spectrum of the $D_2$ molecule was recorded with moderate resolution (line widths $\approx 0.013$ nm). The resolution was limited by Doppler broadening of spectral lines. After numerical deconvolution of the recorded intensity distributions and proper calibration of the spectrometer the new set of wavenumber values was obtained. The results are reported in the form of an atlas divided into 36 sections covering about 1.5 nm, containing pictures of images in the focal plane of the spectrometer, intensity distributions in linear and logarithmic scales and the table containing wavenumber and relative intensity values for 6545 spectral lines together with existing line assignments.