The photolysis of methane at 584 A
The photolysis of methane at 584 A
复制标题
甲烷在 584 A 下的光解
DOI：
10.1021/ja01028a049
复制
发表时间：
1968
期刊：
影响因子：
--
通讯作者：
P. Ausloos
中科院分区：
文献类型：
--
作者：
R. Rebbert;P. Ausloos
Recent studies from this laboratory2-5 have demonstrated the feasibility of using conventional closedsystem photolysis techniques with high-energy light sources as a means of studying the unimolecular fragmentation of parent ions and superexcited mole-cules, as well as the ensuing reactions of fragment ions or radicals. Such studies have been carried out using krypton3 resonance lamps (1236 A, 10.0 eV) and, more recently, argon resonance lamps3-5 (1067-1048 Á, 11.6-11.8 eV) which emit photons of energy high enough to ionize most hydrocarbons. Such photons can be transmitted through ordinary lithium fluoride windows.In order to extend such studies to still higher energies, a helium resonance lamp (584 Á, 21.2 eV) and neon resonance lamp (744 A, 16.7 eV) have now been con-structed utilizing the same simple enclosed-lamp design as described before2 for argon, krypton, and xenon lamps. Aluminum, which transmits in this wavelength region, was considered to be the best material for a window. 63 The window was thus constructed of an aluminum6* 5 film, 2000-4000 Á thick, attached to a fine-mesh backing. These titanium gettered lampsonly emit the strongly reversed rare gas resonance lines. They are leak-free and capable of withstanding a pressure differential of at least 25 torr without damage to thewindow. The helium lamp used in this study actually has been operated for 1000 hr without deterioration; there is no diffusion of helium through the window. The lamps will be described in detail in a later publication. 7 The intensity of the helium lamp,~ 1013quanta/sec, varied by not more than 5% during the course of an experiment, or from one experiment to another.
