Abstract Spectra of dimers and trimers containing C6D6 and He, Ne, Ar, or H2 are observed in the region of the C6D6 ν12 fundamental using a pulsed supersonic jet expansion and a tunable optical parametric oscillator laser source. These are the first reported infrared spectra of hydrogen – benzene complexes. Two bands coupled by anharmonic resonance are studied for each complex: the ν12 fundamental itself (≈2289 cm−1) and the ν2 + ν13 combination band (≈2276 cm−1). Vibrational shifts for the trimers are found to be approximately twice those of the corresponding dimer. Effective intermolecular separations for (H2)1,2-C6D6 are about 3.46 A, similar to those determined previously from electronic spectra of (H2)1,2-C6H6 and also similar to (Ne)1,2-C6D6.

中文翻译：

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(H2)1,2 - C6D6 和 Rg1,2 - C6D6 复合物的红外光谱，Rg = He、Ne、Ar

摘要 使用脉冲超音速射流膨胀和可调光学参量振荡器激光源在 C6D6 ν12 基波区域观察到含有 C6D6 和 He、Ne、Ar 或 H2 的二聚体和三聚体的光谱。这些是首次报道的氢-苯配合物的红外光谱。对于每个复合体，研究了通过非谐共振耦合的两个带：ν12 基波本身（≈2289 cm-1）和 ν2 + ν13 组合带（≈2276 cm-1）。发现三聚体的振动位移大约是相应二聚体振动位移的两倍。(H2)1,2-C6D6 的有效分子间分离约为 3.46 A，类似于之前从 (H2)1,2-C6H6 的电子光谱确定的那些，也类似于 (Ne)1,2-C6D6。