A xenon arc lamp Is used as an exciting source for supersonic jet spectrometry. Fluorescence excitation spectra of aniline and Its derivatives are recorded with spectral resolutions of 0.1-0.3 nm. The selective determination of these compounds Is achieved by using supersonic Jet spectrometry. By contrast, room-temperature vapor-phase spectrometry provides broad and complicated spectra, and resolution of these compounds Is difficult from the excitation spectrum. The performance of lamp-excitation fluorlmetry Is compared with laser-excitation fluorlmetry. Supersonic jet expansion is now widely used for fundamental spectroscopic studies, since it produces cold, isolated, gas-phase molecules and therefore provides a greatly simplified spectrum (1). However, analytical applications have only begun to appear (2, 3). With this technique fluorescence excitation spectra of polycyclic aromatic hydrocarbons are measured, and the selective determinations of these compounds have been achieved (4-6). It is noteworthy that the
The development of an anti-corrosive integrated mass flow controller made by micromachining is described. Stainless steel (SUS316, SUS316L) was used as a material to prevent corrosion. The mass flow controller consists of a thermal flow sensor and a flow control valve driven by a unimorph actuator. The valve could control the flow rate from 0 to 90 SCCM at 75kPa of N2 gas when the voltage of the piezoelectric disk was varied from 75V to -75V.
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