Ro-vibrationally excited molecules of deuterium are involved in non-equilibrium chemical reactions in divertor region of tokamak, molecular assisted recombination, or in neutral beam injector to produce negative ion, dissociative electron attachment, for fusion plasmas. These molecules produced both in a plasma volume and on surfaces are no longer in their electronic ground state X ${}^1{\sum }_g^{+}(v^{\text{”}}⩾0,J^{\text{”}})$ and populate non-uniformly different vibrational (v″) and rotational levels (J″). The high resolution VUV Fourier Transform spectrometer of the DESIRS beam line (SOLEIL synchrotron) is applied to directly scrutinize the ro-vibrationally excited levels of the D₂ ground state from v″ = 0 to 10 and J″ up to 8 in an electron cyclotron resonance (ECR) cold plasma. This is performed for different plasma-facing materials, i.e. quartz, tantalum, tungsten, and stainless steel, in order to compare their relative impact in molecular excitation through recombinative desorption from surfaces. A significant effect of these materials on the absolute distribution of the vibrationally states has been found above v″ > 3. The experimental detection limit for Quartz is v″ = 7 whereas tungsten and stainlees steel excite the molecules up to v″ = 9 and tantalum up to v″ = 10. The use of a bare, temperature-controlled surface of Quartz as a reference, compared to metallic surfaces, allows us to determine the relative production of these excited levels. The recombinative desorption rate on tungsten and stainless steel compared to quartz is ∼ 2.6 higher and reaches ∼ 5 for tantalum.

Ro振动激发的氘分子参与托卡马克分流器区域的非平衡化学反应，分子辅助重组或中性束注入器产生负离子，解离电子附着，以用于聚变等离子体。这些在等离子体体积和表面上产生的分子不再处于其电子基态X ${}^{\mathrm{1个}}{\sum }_G^{+}（v^{\text{”}}⩾0，{Ĵ}^{\text{”}}）$并填充非均匀不同的振动（v''）和旋转水平（J''）。DESIRS光束线的高分辨率VUV傅里叶变换光谱仪（SOLEIL同步加速器）用于直接检查D ₂的旋转振动激发能级在电子回旋共振（ECR）冷等离子体中，基态从v” = 0到10到J''直至8。这是针对不同的面向等离子体的材料（例如石英，钽，钨和不锈钢）执行的，以比较它们通过从表面重组解吸而在分子激发中的相对影响。在v''> 3以上，已发现这些材料对振动状态的绝对分布有显着影响。石英的实验检测极限为v''= 7，而钨和不锈钢使分子激发到v''= 9和钽高达v''=10。与金属表面相比，使用裸露的，温度受控的Quartz表面作为参考，与金属表面相比，我们可以确定这些激发能级的相对产生。