transmission electron microscopy high-resolution transmission electron microscopy phase contrast TEM HRTEM HR-TEM HR/TEM high resolution transmission electron microscopy HR TEM phase-contrast TEM phase contrast transmission electron microscopy Transmission electron microscopy where the phase contrast between the transmitted interfering electron waves is used to produce an image. high resolution TEM high-resolution TEM CHMO:0000084 high resolution (HR) TEM phase-contrast transmission electron microscopy