The Electronic Spectrum and Energy Levels of the Deuterium Molecule

Abstract

Beginning in the 1930s, G.H. Dieke and his students carried out an extensive program of measuring the optical spectrum of molecular hydrogen and its isotopes. Parts of the work were published but the project was interrupted by Dieke’s death in 1965, with much of the latest and most accurate work unpublished. This paper gives the 27 488 lines of molecular deuterium, measured by Dieke, arranges the 8243 assigned lines into band systems, and derives rotational–vibrational energy levels for over 50 electronic states. It also derives energy levels from published vacuum ultraviolet spectra of D2.

VUV Fourier-transform absorption study of the Lyman and Werner bands in D2

“…Observed transition frequencies over the full depth of the potential wells of the B 24 and Abgrall et al 21 observed only vibrational levels v = 0-18.…”

“…38,39 In a study of the emission spectrum of D 2 , the existing potentials were semi-empirically optimized by fitting to line intensities and line positions in the spectrum, resulting in a slightly deviating potential energy curve. 21 Experimental line positions were taken from the analysis by Freund et al, 24 who analysed the extensive emission dataset from Dieke's laboratory group. In Fig.…”

“…Another extensive study is based on the emission data by Dieke's laboratory group, collected over 30 years starting in the early 1930s. This dataset was analyzed and published by Freund et al 24 Recently, Gabriel et al 25 have investigated the Lyman bands of high rovibriationally excited D 2 molecules, extending the available data of level energies to high rotational states.…”

Development of the gas puff charge exchange recombination spectroscopy (GP-CXRS) technique for ion measurements in the plasma edge

“…16, where the measured spectrum right before and after the gas puff is shown for the outermost view (ρ ≈ 1.04) of the LFS poloidal periscope. For illustration, the position of tabulated molecular deuterium lines 42 The parts of the spectra outside the wavelength region of the Boron lines can be used to detect the presence of D 2 lines. One can then exclude these spectra in the analysis.…”

Multi-view fast-ion D-alpha spectroscopy diagnostic at ASDEX Upgrade

“…This permits unperturbed measurements with these LOS also during edge-instabilities. 25 are shown that correspond to n = 3 → 2 transitions of the D2 triplet system.…”