Spectrometer continued

The CO-TPD measurements were performed in a flow reactor, described elsewhere [12]. A quadropole mass spectrometer continuously analysed the gas composition after the monolith... 

Instrumentation. Spectra were acquired with a Nicolet 60SX FTIR spectrometer, continuously purged with dry air and equipped with a liquid-nitrogen-cooled, wideband mercury-cadmium telluride detector. Coaddition of 100 interferometer scans at 8-cm 1 resolution was employed. The location of absorption maxima was confirmed by spectra taken at l-cm 1 resolution. All spectra were converted into Kubelka-Munk units prior to use. Integration of peak areas was accomplished by using software available on the Nicolet 60SX. All peak areas were normalized to the 1870-cm-1 Si-O-Si combination band (15). 

Dissolved Gases in Biochemical Systems with the Quadrupole Mass Spectrometer, Continuous Measurement of (Degn, Cox, and Lloyd). .. Electrochemical Detection, Biomedical Uses of High-Performance Liquid... 

Spectra were acquired with a Nicolet 60SX FTIR spectrometer, continuously purged with dry air and equipped... 

UV-Visible absorption spectrometry is the most commonly used method in modem enzymatic analysis. Suitable spectrometers are found in every laboratory, and many analyses use simple, robust, relatively cheap instruments. The availability of disposable polystyrene or acrylic cuvettes is a further advantage for conventional solution studies, but many analyses now use microtiter plates, the individual wells of which can be examined in a simple spectrometer. Continuous flow systems are also simple to set up. Most spectrometers are interfaced with personal computers, which offer a range of control and data handling options. 

The rate law is first order with respect to both [e ] and [R2S], where R = Me, Et, or Pr . The technique of continuously mixing solutions of solvated electrons (Na dissolved in NH3) with substrates in the cavity of an e.s.r. spectrometer continues to be used. Radical anions have been characterized in the reactions with acrylic acid and with some dicarboxylic acids. 

For use in GC-MS systems, attention should be paid to the injection at the necessary high flow rates in connection with the maximum permitted carrier gas loading of the mass spectrometer. As the injection system is always cold, moisture can accumulate from samples or insufficiently purified carrier gas (Figure 2.75). Because of this, the sensitivity of the mass spectrometer could be compromized. The effect is easy to detect because the mass spectrometer continually registers the water background and because the on-column injector can easily be opened at a particular time so that the carrier gas can pass out via the splitter. 

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