IUPAC of thiols

The first vibrational spectrum of adsorbed molecules obtained by inelastic scattering of low energy electrons was obtained by Propst and Piper in 1967. Over the next ten years, Ibach in Jiilich achieved much higher resolution and, along with several other research groups, developed and used the new technique (HREELS) to study a wide range of surface vibrations, including polyatomic molecules adsorbed on surfaces. The enthusiasm existed mainly because HREELS could be used to study adsorbates on low surface-area, opaque, metal single-crystal samples, something that could not be done with infrared and Raman spectroscopy. It is now well-established as an important vibrational spectroscopy at surfaces, and its utility as an analytical tool with extreme surface sensitivity is rapidly being extended.  [c.443]

Sealing tlie Centi-ifiig Chemical Pump Altliougb detailed treatment of. shaft seals is presented iu tbe subsection Sealing of Rotating Shafts, it is appropiiate to mention here tlie special problems  [c.906]

For widespread use as a common analytical technique the detection of quantifiable signals is strictly necessary, and this is a principle problem that IBSCA shares with SIMS - application to the analysis of metals and semiconductors has shown that the photon yield is highly dependent on the surface oxygen content and oxygen partial pressure [4.248-4.251]. For oxidic samples, e.g. glass or glass ceramic, in contrast, the matrix-dependence usually proves to be negligible so IBSCA can be used for stoichiometric quantification [4.252, 4.253]. IBSCA is, therefore, mainly used as an analytical tool in combination with other methods, e.g. SIMS, for the analysis of highly insulating surfaces and thin films. Most applications deal with the depth profiling of multilayer structures on glass substrates, and with the characterization of the nearsurface structures of glass samples which are often different from the bulk stoichiometry caused by interaction with the environment.  [c.241]

Long-term vibration trends are a useful diagnostic tool. Trending techniques involve graphically comparing the total energy, which is the sum of the frequency components amplitude over some consistent, user-selected frequency range (i.e., Fmin to f iviAx)> over a long period to get a historical perspective of the vibration pattern. Plots of this sum against time (e.g., days) provide a means of quantifying the relative condition of the monitored machine (see Figure 44.24). Most predictive-maintenance systems provide automatictrending capabilities for recorded data. This is not to be confused with time-domain plots, which are instantaneous measures of total vibration amplitude plotted against time measured in seconds.  [c.727]

See pages that mention the term IUPAC of thiols : [c.456]    [c.180]    [c.219]    [c.163]    [c.7]    [c.16]    [c.22]    [c.24]    [c.30]    [c.31]    [c.31]    [c.37]    [c.161]    [c.238]    [c.239]    [c.239]    [c.241]    [c.246]    [c.303]    [c.322]    [c.336]    [c.338]    [c.339]    [c.14]    [c.69]    [c.1224]   
Carey organic chemistry (0) -- [ c.648 ]

Organic chemistry (0) -- [ c.648 ]