---
title: "Electron probes: reading the evidence"
description: "From crystal diffraction to electron imaging and chemical shifts: follow the apparatus, retained records and limits of inference."
canonical_url: "https://sandboxphysics.com/stories/electron-evidence/"
language: "en"
page_type: "story"
alternate_languages:
  zh-CN: "https://sandboxphysics.com/zh/stories/electron-evidence/"
last_modified: "2026-10-22"
---

[Quantum physics: reading the evidence](https://sandboxphysics.com/stories/quantum-evidence/)

Diffraction · Imaging · Spectroscopy

# Electron probes: reading the evidence

From crystal diffraction to electron imaging and chemical shifts: follow the apparatus, retained records and limits of inference.

The same electron can help test a wavelength, form an image or reveal an energy difference. Each instrument retains a different record. Read the three articles in order, or start from the signal you want to understand.

1. ## [Electron diffraction: two experiments, one wavelength test](https://sandboxphysics.com/stories/electron-evidence/electron-diffraction-crystal-records/)

   How did angular currents and photographic rings turn a matter-wave proposal into a quantitative test?

2. ## [Ruska: making an electron image was only the beginning](https://sandboxphysics.com/stories/electron-evidence/ruska-electron-microscope-resolution/)

   What separated a magnified grid from a microscope capable of revealing finer structure?

3. ## [Kai Siegbahn: when electron energies began to reveal chemistry](https://sandboxphysics.com/stories/electron-evidence/siegbahn-electron-spectroscopy-chemical-shifts/)

   What turns a resolved photoelectron peak into evidence about bonding near a surface?

## Three records, three questions

1927 diffraction: do directions and voltage agree with a momentum-dependent wavelength? 1931–1933 imaging: can successive magnetic lenses retain finer specimen detail? 1950s–1960s spectroscopy: can resolved electron energies distinguish local environments? The associated prize years—1937, 1986 and 1981—are separate from those experimental dates.

[Continue: probes, light and measurement](https://sandboxphysics.com/stories/probe-evidence/) [Electron diffraction: two experiments, one wavelength test](https://sandboxphysics.com/stories/electron-evidence/electron-diffraction-crystal-records/) [Ruska: making an electron image was only the beginning](https://sandboxphysics.com/stories/electron-evidence/ruska-electron-microscope-resolution/) [Kai Siegbahn: when electron energies began to reveal chemistry](https://sandboxphysics.com/stories/electron-evidence/siegbahn-electron-spectroscopy-chemical-shifts/) [Before the apparatus: de Broglie’s matter waves](https://sandboxphysics.com/stories/quantum-evidence/de-broglie-matter-waves-phase-packets/)