VUV wavelength

In the measurements of the PHOFEX spectrum, we scanned the VUV wavelength while the photofragment of S(]5) was monitored by exciting the S(3D )-S(lS) transition by UV laser light. Since only the fluorescence emitted from the S(3D]> fragments in the central region of the free-jet expansion was collected, the photoabsorption of ultracold (-5 K) OCS was selectively... 

As the most sensitive lines of a number of elements such as S, P, C and As are at VUV wavelengths, access to this spectral range is required, which necessitates the elimination of oxygen from the entire optical path. This can be achieved by continuous evacuation of the spectrometer, purging with nitrogen or argon or by the use of sealed gas-filled spectrometers. Accordingly sensitive lines of Br, Cl, I, N, P and S become available for the ICP (see Refs. [346, 347] for N and Heitland [348] for the other elements) (Table 10). Then, however, the path between the ICP and... 

As a number of elements have their most sensitive lines at VUV wavelengths, such as N, O, P, S, Cl and H, access to the VUV region is very important, as is possible through the use of sealed spectrometers with air-tight flushed spark stands. For elements that are highly relevant metallurgically, such as C, O, H and N, efforts to lower the blank values due to the environment gases are still required to be able to replace classical C, H, N, O analyzers based on sample combustion. 

At the short VUV wavelengths of the oxygen plasma, all of the polyimide films will have a very high absorbance, and these energies will produce excited sigma states in the surface molecules of the exposed films that will lead to bond breakdown and molecular degradation. 

An intense coherent tunable Fourier-transform-limited narrow-band all-solid-state vacuum-ultraviolet (VUV) laser system has been developed by Merkt and coworkers [573]. Its bandwidth is less than 100MHz and the tuning range covers a wide spectral interval around 120,000 cm (15 eV). At a repetition rate of 20 Hz the output reaches 10 photons per pulse, which corresponds to an energy of 0.25 nJ per pulse, a peak power of 25 mW for a pulse length of 10 ns, and an average power of 5 nW. For these short VUV wavelengths of around A = 80 nm this is remarkable and is sufficient for many experiments in the VUV. 

In order to access short VUV wavelengths down to the LiF cutoff (110 nm), the resonant four-wave mixing process is quite efficient. This tech-... 

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