F（2P）原子与CH3OH反应可见化学发光研究

F（²P）原子与CH₃OH反应可见化学发光研究

摘要: 本文研究了氟原子F（²P）与CH₃OH反应的可见区（300～900nm）化学发光,得到了HF⁺（v′=3→v′=0）振动跃迁和CH₂（a³,A₂→X¹A₁）电子态跃迁的发射谱,并求出基电子态CH₂O分子C-O拉伸模的光谱常数:ω_e=1762.5cm^-1,ω_eχ_e=9.4cm^-1,ω₂=1743.6cm^-1,其值与吸收光谱中的结果能较好地一致.机理分析认为激发态分子CH₂O（a³A₂）是由F原子先后提取CH₃OH分子中的两个H原子且优先形成非平面分子而形成的。

Abstract: Visible chemiluminescence in the region of 300～900nm was measured from the reaction of F（²P） atoms with CH₃OH at various pressures using crossed molecular beam apparatus. The emission of HF⁺（v′=3→v′=0） overtone transition was only observed under low pressure condition. As the pressure increased, long progressive bands of CH₂O（a³A₂→X¹A₁） were observed besides HF（3,0）. It is the first observation of CH₂O（a³A₂→X¹A₁） emission. The spectrum constants of C-O stretch mode （v₂） were obtained:ω_e=1762.5cm^-1,ω_eχ_e=9.4cm^-1,ω₂=1743.6cm^-1
The reaction mechanism was discussed, it is proposed that the out of plane molecule CH₂O（a³A₂） was produced as two H atoms were abstracted from the molecule CH₃OH.