Cathodoluminescence imaging on quartz in sandstone

Cathodoluminescence intensity mapping: Adding an extra dimension to your research

Posted by Noor van der Veeken on Dec 8, 2016 11:00:00 AM

Those who understand the basic mechanisms of cathodoluminescence (CL) know that it is essentially a useful byproduct of electron microscopy. Fast electrons that are fired at a material cause it to become excited, thereby emitting photons of characteristic wavelength. Measuring the CL intensity of your sample can provide valuable information about your sample complementary to other techniques such as SE, BSE, EBSD or EDS.

This blog post further explains how CL intensity mapping exactly works and how it can be employed in various types of research.

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Topics: materials science, cathodoluminescence


Glowing yellow calcite and green aragonite: Cathodoluminescence sheds light in geosciences

Posted by Kaitlin van Baarle on Sep 14, 2016 2:00:00 PM

In the nineteenth century, before the development of modern technology as we know it now, vacuum tubes were widely used to study the fundamental properties of materials and objects. During this period, William Crookes, the inventor of the vacuum tube, was studying various objects with these tools. At the time, scientists were unsure of the exact processes that were occurring, but in these vacuum tubes electrons were essentially being fired at objects at the end of the vacuum tube. These electrons excited the materials which caused them to produce light when they returned back to their equilibrium state, a process known as cathodoluminescence (CL). This process is still being used in geology as well as other scientific fields, albeit with much more complex and efficient technology. To this day, CL is an extremely useful tool in the geosciences and is experiencing a resurgence in popularity with the ability to integrate it with a scanning electron microscope [2].

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Topics: materials science, cathodoluminescence


Overlay in the life sciences: A question of objectivity and accuracy

Posted by Kaitlin van Baarle on Aug 22, 2016 7:16:34 PM

It is rare that scientific research will rely on a single method. Instead, findings need to be built on multiple types of data to ensure accuracy. For this reason, overlaying images from different microscopes is often a chosen method for researchers, particularly in the life sciences. What is frequently combined is data from an electron microscope (EM) and a fluorescence microscope (FM). These images are then often “overlayed” for a complete picture of the data.

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Correlative microscopy: Opening up worlds of information with fluorescence

Posted by Kaitlin van Baarle on Jul 28, 2016 12:43:21 PM

Scientists of all fields are most certainly familiar with the miniature worlds unearthed by electron microscopy. From the complex structures of viruses to extremely small forensic evidence, the revelations brought about by this technology have led to enormous developments in the scientific world. The wavelength of fast electrons is significantly smaller than that of visible light, creating images that were previously unobtainable with conventional light microscopy. For life scientists in particular, the main advantage of electron microscopy (from here on referred to as EM) is the contrast that the black-and-white high-resolution images reveal, providing essential information on the structure of a cell, organelle, or organic tissue.

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Topics: correlative microscopy, life sciences


From the discovery of the electron to subwavelength microscopy: An introduction to cathodoluminescence

Posted by Kaitlin van Baarle on Jul 1, 2016 11:53:08 AM

In 1897, the electron was discovered by Sir Joseph John Thomson. The physicist and eventual Nobel Prize winner was in fact conducting research on “cathode rays”. At the time, cathode rays were only known as the consequence of an electric current that was passed through a vacuum tube. It was observed that electrically charged particles would collide with atoms at the end of the tube and excite them, thus causing them to fluoresce, or emit fluorescent light. It was further made evident that these were rays travelling in a straight line from one end of the tube to the next, by placing a shape in the middle of the tube and observing that very shape casting a shadow at the end of the tube.

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Topics: materials science, cathodoluminescence


Super-resolution correlative microscopy: The perfect combination of function and structure

Posted by Kaitlin van Baarle on May 3, 2016 4:05:03 PM

As a researcher in the life sciences, your work will very likely involve studying various parts of a cell at small length scales. In particular, you may be interested in examining biomolecules and their function within the greater context of the cell as a whole. Recent technological and methodological developments in microscopy have made this process much more straightforward, with integrated fluorescence and electron microscopy. Such a system allows for automatically overlayed images from both an electron and a light microscope, providing you with the ability to identify certain organelles or biomolecules by tagging, at the same time that you are able to localize where they are situated within the cell. More recently, super-resolution fluorescence imaging has been developed, which opens up even greater opportunities for learning about the complexities of life.

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Topics: correlative microscopy, life sciences