National Synchrotron Radiation Research Center, No. 101, Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076 (Taiwan).
Angew Chem Int Ed Engl. 2014 Jan 13;53(3):738-41. doi: 10.1002/anie.201306876. Epub 2013 Nov 29.
The photodissociation of gaseous molecular nitrogen has been investigated intensively, but the corresponding knowledge in a solid phase is lacking. Irradiation of pure solid nitrogen at 3 K with vacuum-ultraviolet light from a synchrotron produced infrared absorption lines of product l-N3 at 1657.8 and 1652.6 cm(-1). The threshold wavelength to generate l-N3 was determined to be (143.7±1.8) nm, corresponding to an energy of (8.63±0.11) eV. Quantum-chemical calculations support the formation of l-N3 from the reaction N2 +N2, possibly through an activated complex l-N4 upon photoexcitation with energy above 8.63 eV. The results provide a possible application to an understanding of the nitrogen cycle in astronomical environments.
气态分子氮的光解已经得到了深入研究，但固相中的相应知识却缺乏。用同步加速器产生的真空紫外光辐照 3 K 下的纯固态氮，产生了产物 l-N3 的红外吸收谱线，位于 1657.8 和 1652.6 cm(-1)。生成 l-N3 的阈值波长被确定为（143.7±1.8）nm，对应于（8.63±0.11）eV 的能量。量子化学计算支持 l-N3 通过 N2 + N2 反应形成，可能通过光激发时的活性络合物 l-N4，其能量超过 8.63 eV。这些结果为理解天文环境中的氮循环提供了一种可能的应用。
