利用雷射光解-共振螢光法測量自由基Cl與CF3CH2Cl(HCFC-133a)之反應速率常數值

Abstract

本研究是利用雷射光解-共振螢光法測量自由基Cl與CF3CH2Cl(HCFC-133a)之反應數率常數值。以波長355nm的雷射光解Cl2製造Cl，再以共振螢光法偵測其濃度隨時間變化之情形。 Cl + CF3CH2Cl → HCl + CF3CHCl 在室溫297 K及壓力為10-100 torr時得到k = (1.07±0.08)×10-14 cm3 molecule-1 s-1，得知壓力以及光解能量對實驗結果沒有影響。 此外，我們於297-550 K間測量此反應速率常數，得到的阿瑞尼亞士關係式為k(T)=(6.3±3.1)×10-12exp[-(1940±186)/ T] cm3 molecule-1 s-1。

The absolute rate coefficient for the reactions of Cl radicals with CF3CH2Cl (HCFC-133a) have been measured using laser photolysis – resonance fluorescence technique between 297-550 K and at pressure 10-100 torr。Cl radicals were produced by photolyzing Cl2 molecules with a Nd-YAG laser output at 355nm。 Cl + CF3CH2Cl → HCl + CF3CHCl We obtained k(T)=(6.3±3.1)×10-12exp[-(1940±186)/ T] cm3 molecule-1 s-1，with k(297K)= (1.07±0.08)×10-14 cm3 molecule-1 s-1。No pressure and laser power effect were observed。