Jansen Charlotte, Juurlink Ludo B F
Leiden Institute of Chemistry, Leiden University, Leiden, Netherlands.
Front Chem. 2023 Aug 24;11:1250711. doi: 10.3389/fchem.2023.1250711. eCollection 2023.
Internal vibrations may affect the adsorption, scattering, and reactions of molecules impinging onto a surface. The energy of the antisymmetric stretch vibration of CO slightly exceeds the desorption energy of CO bound to CO ice. We use supersonic molecular beam techniques and rovibrationally state-resolved excitation to determine whether this vibration affects condensation of gas phase CO to its ice. We detect sticking and CO ice formation using RAIRS and quantify the sticking probability using the King and Wells method with modulation of the vibrational excitation and Fourier transform based detection. We find that the influence of this vibration on the structure of the formed ice and on the sticking probability is negligible under our conditions. Based on our detection limit, we quantify the weighted average sticking probability at approximately 0.9 and the difference between the state-resolved and weighted average sticking probability as below 0.03%.
内部振动可能会影响撞击到表面的分子的吸附、散射和反应。CO反对称伸缩振动的能量略超过与CO冰结合的CO的解吸能量。我们使用超音速分子束技术和振转态分辨激发来确定这种振动是否会影响气相CO凝结成其冰的过程。我们使用反射吸收红外光谱法（RAIRS）检测吸附和CO冰的形成，并使用金和韦尔斯方法通过调制振动激发和基于傅里叶变换的检测来量化吸附概率。我们发现，在我们的条件下，这种振动对形成的冰的结构和吸附概率的影响可以忽略不计。基于我们的检测限，我们将加权平均吸附概率量化为约0.9，并且振转态分辨吸附概率与加权平均吸附概率之间的差异低于0.03%。
