"It was during my enchanted days of travel that the idea came to me, which, through the years, has come into my thoughts again and again and always happily - the idea that geology is the music of the earth."

Hans Cloos

Welcome to the Electron Microprobe Laboratory (JEOL-8230) at CU Boulder (Department of Geological Sciences)!

About the JEOL-8230...

Microprobe info

General information about the JEOL-8230 electron microprobe installed in March 2016 at the University of Colorado Boulder.


Examples of application obtained on the JEOL-8230.

Microprobe database

The Database of electron Microprobe Analysis (De-MA). Get the information you need to prepare your analysis, make a reservation to use the microprobe, check for X-ray peak interferences, etc.

Contact information

The laboratory is in the mid of a change in management. Dr. Julien M. Allaz has resigned. The new laboratory manager, Dr. Aaron Bell, will take position on June 4th.

During the transition period (mid-April to June 2018), please, contact the laboratory director, Prof. Kevin H. Mahan (kevin.mahan@colorado.edu) or the lab assistant Phil Orlandini (omero.orlandini@colorado.edu).

EPMA staff

EPMA spring class 2018

Information & material for the electron microprobe analysis class, a course designed for an in-depth understanding and use of microanalytical techniques in solid materials (e.g., alloy, ceramics, glass, minerals). This course covers the following subjects:

  • Essential theory on scanning electron microscope and electron microprobe analysis
  • Basics on instrument vacuum system, electron gun... and other devices.
  • Electron interaction with solid materials, X-ray production...
  • Secondary electron (SE) & back-scattered electon (BSE) images, X-ray element mapping...
  • Energy and Wavelength Dispersive Spectrometry (EDS / WDS)
Click here to learn more!

Website design: J.M. Allaz © update April 10th, 2018
Background picture: View on the southern Alps from Pizzo Forno (Ticino, Switzerland; J.M. Allaz © 2008).