High resolution electron energy loss spectroscopy
（重定向自HREELS）
![HREELSpectrum showing surface phonons at 15 and 38 meV (The appearance of peaks on both sides of the elastic scattering peak can be understood by looking at Raman spectroscopy)](/Images/godic/202501/18/HREELS_spectrum5450.gif")
![Figurative interpretation of dipole scattering](/Images/godic/202501/18/HREELS_dipole_scattering5450.JPG")
![Principle of a HREELS setup](/Images/godic/202501/18/HREELS_Spectrometer.svg5451.png")
High resolution electron energy loss spectroscopy (HREELS) is a tool used in surface science. The inelastic scattering of electrons from surfaces is utilized to study electronic excitations or vibrational modes of the surface or of molecules adsorbed to a surface. Hence in contrast to other electron energy loss spectroscopies (EELS) HREELS deals with small energy losses in the range of 10 eV to 1 eV. It plays an important role in the investigation of surface structure, catalysis, dispersion of surface phonons and the monitoring of epitaxial growth.