Rovibrational spectra of Ar–N₂O and nonpolar (N₂O)₂ van der Waals complexes have been recorded from 1157.2 to 1176.7 cm⁻¹ in 2v₂ overtone band region of N₂O monomer using an external-cavity quantum cascade laser to probe the direct absorption in a slit supersonic jet expansion. One a/b hybrid vibrational band was identified for nonpolar (N₂O)₂, and one b-type vibrational band for Ar–N₂O, respectively. Quantum chemical calculations of vibrational frequencies and infrared intensities of these two complexes were performed at the MP2/aug-cc-pvtz level of theory. The first vibrational band is assigned tentatively as a combination band of the intramolecular symmetric and anti-symmetric in-plane bending modes of nonpolar (N₂O)₂. The second vibrational band is assigned as an overtone band of the bending mode of Ar–N₂O. Precise molecular constants have been derived for these two complexes. The band-origin is located at ${\upsilon }_0$ = 1168.177584(76) cm⁻¹ for Ar–N₂O and ${\upsilon }_0$ = 1165.218580(54) cm⁻¹ for nonpolar (N₂O)₂, which shows a blue-shift by 0.0451 cm⁻¹ for Ar-N₂O and a red-shift by 2.9139 cm⁻¹ for nonpolar (N₂O)₂ compared with that of the N₂O (02⁰0)-(00⁰0) band, respectively.

使用外腔量子级联激光在N ₂ O单体的2 v ₂泛音带区域中记录了Ar–N ₂ O和非极性（N ₂ O）₂范德华配合物的振动光谱，范围为1157.2至1176.7 cm ^-1。以探测狭缝超音速射流膨胀中的直接吸收。对于非极性（N ₂ O）₂，确定了一个a / b混合振动带，对于Ar–N ₂，确定了一个b型振动带。分别为O。这两种配合物的振动频率和红外强度的量子化学计算是在理论上的MP2 / aug-cc-pvtz水平进行的。第一振动带暂定为非极性（N ₂ O）₂的分子内对称和反对称平面内弯曲模式的组合带。第二个振动带被指定为Ar–N ₂ O弯曲模式的泛音带。已经为这两个络合物推导了精确的分子常数。带区位于${\upsilon }_0$对于Ar–N ₂ O和 = 1168.177584（76）cm ^-1${\upsilon }_0$ = 1165.218580（54）厘米^-1对非极性（N ₂ O）₂，其示出了蓝移由0.0451厘米^-1作为Ar-N ₂ O和红移由2.9139厘米^-1非极性（N ₂ ö ）_2分别与N ₂ O（02 ⁰ 0）-（00 ⁰ 0）频段的相比较。