Photodissociation of Methane at Lyman Alpha (121.6 nm)

Bulletin of the Korean chemical society

Jin Wook Han¹  Whikun Yi¹  Jungwoo Lee¹  Jaehong Park¹  Kijo Sim¹ 

关键词: Photodissociation;    Methane;    Lyman ¥á;    LIF;    Quantum yield;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

Laser induced fluorescence studies of hydrogen atom using four wave mixing technique are reported for the photodissociation of CH₄ and its isotopomers at Ly�? (121.6 nm). The source of dissociating and probe radiation is one and the same (delay time ÷ 20 nsec). The average translational energy of ejected hydrogen atoms (50 Kcal/mol) reveals that CH₄ + h�? �? CH₃ + H(²S) and CH₄ + h�? �? CH₂(a¹A₁) + H₂(¹ヒg) are the main dissociation processes. The absolute quantum yield for CH4 and CD₄ are the same, フH(CH₄) = フD(CD₄) = 0.31 �? 0.05. If one divides the experimental H/D ratios from the isotopomers CH₃D, CH₂D₂, CHD₃ by the isotopic H/D ratios, a value 2 is obtained in all three cases. Overall, the heavier D atoms are more likely than the H atoms to remain attached to the carbon atom.

【 授权许可】

Unknown