High Resolution Optical and Vibrational Spectroscopy with Low Loss EELS
نویسندگان
چکیده
Despite being diffraction limited to thousands of Ångstroms, infrared and optical spectroscopies remain effective characterization techniques. While it is possible to perform subatomic resolution electron energy loss spectroscopy (EELS) at unprecedented energy resolution, with ever improving aberration correctors and monochromators, it is argued that low loss features can be severely delocalized (up to hundreds of Ångstroms for optical excitations and millions of Ångstroms for vibrational states) which would suggest poor prospects for atomic resolution imaging [1]. Here, we go beyond the traditional multipole expansions and construct an exact treatment of the near-field inelastic scattering that predicts atomic-scale resolution for monopolar optical and vibrational excitations.
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