transmission kikuchi diffraction

**TKD** (Transmission Kikuchi Diffraction) is a **variant of EBSD that uses thin, electron-transparent samples analyzed in transmission geometry** — achieving ~2-10 nm spatial resolution by reducing the interaction volume, bridging the resolution gap between EBSD and ACOM-TEM. **How Does TKD Work?** - **Sample**: Electron-transparent lamella (like a TEM sample) mounted on a standard EBSD holder. - **Geometry**: Beam transmitted through the thin sample -> Kikuchi pattern detected below. - **Indexing**: Same automated Hough transform as conventional EBSD. - **Resolution**: ~2-10 nm (vs. ~50-100 nm for conventional EBSD). **Why It Matters** - **High Resolution EBSD**: Achieves near-TEM resolution while using a standard SEM + EBSD detector. - **Nanocrystalline Materials**: Maps grain orientations in nanocrystalline thin films where conventional EBSD fails. - **FIB Lamellae**: Works on FIB-prepared cross-sections for site-specific orientation analysis. **TKD** is **EBSD in transmission mode** — achieving nanometer-scale orientation mapping on thin samples using a standard SEM setup.