The absorption spectrum of the nitrogen molecule in the 30 A region has been studied photographically, using synchrotron radiation from a 1.3-BeV electron synchrotron as the background continuum. A 2-m grazing incidence spectrograph with a glass grating was used to take the absorption spectrum. Discrete structure has been observed near the K edge of nitrogen. On the basis of electron configuration, the absorption data obtained are compared with the optical spectroscopic data of the NO molecule and it is found that the absorption structure is well explained as due to the excitations of a Is electron to outer-shell orbitals of the nitrogen molecule. The energy value of 409.5 ±0.1 eV is obtained for the K level of the nitrogen molecule.

The geometric and electronic structures of the V 205(01 0) surface with oxygen vacancies were studied by means of scanning tunneling microscopy/spectroscopy. Vanadyl oxygens which play an important role in an oxidization catalyst are found to be easily desorbed in a line along the c axis by annealing the sample above 500 dc. We obtained the current images of vanadium V 4 + ion rows caused by the desorption of vanadyl oxygens and also the images of V 5 + ion rows distinctively. Periodic vanadium ion rows having about a half-space of lattice constant a of V 205 were observed when almost all vanadyl oxygens were desorbed from the surface.

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