Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada.
Phys Chem Chem Phys. 2010 Jul 28;12(28):7924-33. doi: 10.1039/c002525a. Epub 2010 Jun 3.
Mid-infrared spectra of acetylene aerosol particles generated under conditions relevant to Titan's atmosphere are analyzed in terms of the vibrational exciton model. The analysis reveals that acetylene aerosol particles do not form single crystals below 110 K as previously assumed. Instead, less ordered structures such as polycrystalline particles with orthorhombic crystalline domains or possibly partially amorphous particles derived from an orthorhombic crystal structure are found to be very stable. Annealing of these particles leads to the formation of crystalline particles with an orthorhombic crystal structure. Particles with a cubic crystal structure were never observed at these temperatures in agreement with the phase behavior of bulk acetylene.
中红外光谱分析乙炔气溶胶粒子生成条件下与泰坦的气氛相关的振动激子模型。分析表明乙炔气溶胶粒子不形成单晶在 110 K 以下之前假设。相反,不太有序的结构如多晶粒子与正交晶域或可能部分非晶粒子来自一个正交晶结构被发现是非常稳定的。这些粒子的退火导致结晶粒子的形成具有正交晶结构。粒子具有立方晶体结构从未观察到这些温度与块状乙炔的相行为一致。
