Series of spectra of the S(0) and Q(1)-Q(4) transitions of the (2-0) band of D₂ near 5860 cm⁻¹ are recorded by comb-referenced cavity ring down spectroscopy, at four pressures up to 200 Torr. After averaging, high resolution (30 MHz step) and low noise (noise equivalent absorption, α_min≈ 1.5 × 10⁻¹¹ cm⁻¹) spectra are obtained for each pressure value. This leads to signal to noise ratios of several hundred for the considered very weak electric quadrupole transitions with intensities ranging between 4 × 10⁻²⁹ and 4 × 10⁻²⁸ cm/molecule. The Q(3) and Q(4) transitions are newly detected.

A multi-spectrum treatment of the D₂ line profiles at different pressures performed using a quadratic speed-dependent Nelkin-Ghatak profile leads to residuals close to the noise level. Considering statistical fit errors and possible biases, total uncertainties on the frequencies extrapolated at zero pressure are estimated to be between 0.30 MHz and 1.83 MHz. The derived experimental frequencies and intensities of (2-0) transitions are gathered with literature values and compared to ab initio values reported in J. Komasa, M. Puchalski, P. Czachorowski, G. Łach, K. Pachucki, Phys. Rev. A 100, 032519 (2019). An agreement within the combined uncertainties is achieved for the S(0), Q(1), Q(2) and Q(3) transitions. Line intensities are also discussed in relation with literature values.

通过梳齿参考腔衰荡光谱法在四个压力下记录了D ₂的（2-0）谱带在5860 cm ^-1附近的S（0）和Q（1）-Q（4）跃迁的光谱系列高达200托。平均化，高分辨率（30兆赫步骤）和低噪声（噪声等效吸收，后α_分钟≈1.5×10 ^-11厘米^-1）光谱为每个压力值获得。对于认为非常弱的电四极跃迁，其强度在4×10 ^-29到4×10 ^-28 cm /分子之间，这导致数百的信噪比。该Q（3）和Q（4）转换是新检测到的。

使用与速度相关的二次方Nelkin-Ghatak轮廓对D ₂线轮廓进行多光谱处理会导致残差接近噪声水平。考虑到统计拟合误差和可能的偏差，在零压力下推断出的频率的总不确定性估计在0.30 MHz至1.83 MHz之间。所导出的实验频率和（2-0）转变强度聚集与文献值，并与从头值报道J. Komasa，M. Puchalski，P. Czachorowski，G. LACH，K. Pachucki，物理。Rev.A 100，032519（2019）。在S（0），Q（1），Q的组合不确定度内达成一致（2）和Q（3）转换。还讨论了线强度与文献值的关系。