Schaller Sascha, Gewinner Sandy, Schöllkopf Wieland, Meijer Gerard, Fielicke André
Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany.
Phys Chem Chem Phys. 2024 Aug 14;26(32):21620-21627. doi: 10.1039/d4cp02328e.
Rotationally resolved vibrational spectra of DyO and DyO in a molecular beam are obtained by IR excitation from the X8 ground state and from high- Rydberg states of DyO using an infrared free electron laser. Vibrational excitation is detected either by resonance enhanced multiphoton ionisation from X8( = 1) or by autoionisation of Rydberg states converging to DyO( = 1). For most heavy molecules, the large spectral width of an infrared free electron laser does not allow for rotational resolution. In DyO and DyO the P, Q, and R transitions can be resolved due to the high angular momentum in their ground states. For DyO a vibrational constant of = 847.5(2) cm and a vibrational anharmonicity of = 2.9(1) cm are deduced. For the DyO cation a transition frequency of Δ = 907(1) cm is found.
通过使用红外自由电子激光从DyO的X8基态和高里德堡态进行红外激发，获得了分子束中DyO和DyO的转动分辨振动光谱。振动激发通过从X8（v = 1）的共振增强多光子电离或通过收敛到DyO（v = 1）的里德堡态的自电离来检测。对于大多数重分子，红外自由电子激光的大光谱宽度不允许转动分辨。在DyO和DyO中，由于其基态的高角动量，P、Q和R跃迁可以被分辨。对于DyO，推导出振动常数ω = 847.5(2) cm⁻¹和振动非谐性χ = 2.9(1) cm⁻¹。对于DyO阳离子，发现跃迁频率Δν = 907(1) cm⁻¹。
