波长对NO光解反应的影响

The Effect of Light Wavelength on NO Photolytic Reaction

利用公式ΔGo+RTlnKop=0.1196n/λ计算了不同波长条件下NO光解反应的标准平衡常数.当波长为183 nm和230 nm时,反应NO+hv→N.+O.的标准平衡常数分别为3.64×109和1.45×10-14;当波长为230 nm时,反应2NO+hv→N2+O2的标准平衡常数为e279.72.解释了为什么NO吸收λ<183 nm的光子后解离为游离态的氮原子和氧原子,而吸收λ<230 nm的光子后形成激发态分子NO*,进而与NO反应形成N2和O2.

The standard equilibrium constants of NO photolytic reactions were calculated by the formula △G^0＋RTlnKp^0=0.1196n/A. When light wavelengths （λ） were 183nm and 230nm respectively, the standard equilibrium constants of the reaction NO ＋ hv→N·＋O· were 3.64 ×10^9 and 1.45×10^-14 in order. When light wavelength （λ） was 230nm, the standard equilibrium constant of the reaction 2NO ＋ hv→N2 ＋ O2 was e^279.72. The results explained the reason why NO was decomposed into N· and O· directly after it absorbed photons when λ 〈 183nm, but it was first changed into NO^＊ after it absorbed photons when λ 〈 230nm, and then NO^＊ was changed into N2 and O2 in reaction with NO.