EELS Detection of Molecularly Adsorbed Species on Surfaces
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Brown and Ho [1] used an EELS spectrometer with an incident electron energy of 10 eV, consisting of a double-pass cylindrical monochromator and single-pass cylindrical analyzer, to analyze the interaction between methyl chloride and Si( 100) 2 x 1. Figure 2045 shows the EEL spectra obtained after 1 L exposures of methyl chloride (CH3CI) onto the Si(100) surface held at 85 and 300 K. The origin of the peaks, related to the existence of molecularly adsorbed species, is listed in Table 2045.

EEL spectra obtained after 1 L exposures of methyl chloride onto the Si(100) surface held at 85 and 300 K

Figure 2045. The EEL spectra obtained after 1 L exposures of methyl chloride onto the Si(100) surface held at 85 and 300 K. [1]

Table 2045. The origin of the peaks in Figure 2045.
Energy loss Origin
67 meV The Si-Cl stretch: an adsorbed chlorine atom
89 meV The C-Cl stretch of a weakly bound methyl chloride molecule
85 meV The Si-(CH3) stretch
157 meV The CH3 symmetric deformation mode
178 meV The CH3 asymmetric deformation mode
368 meV The C-H stretch modes

 

 

 

 

 

 

 

 

 

[1] Kyle A. Brown and W. Ho, The interaction of methyl chloride and Si( 100) 2 x 1, Surface Science 338 (1995) 111-116.

 

 

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