What is a Chromophore?

August 21, 2017

What is a Chromophore?

Did you know that certain molecules can actually have coloration? While we do not normally associate coloration with such a small particle of matter, certain molecular phenomena can indeed cause the reflection of selective wavelengths of light, creating color on a molecular level! These particles, known as chromophores, play an important role in the photopigmentation in the eyes.

Within molecules there are electromagnetic energy fields. These energy fields are caused by positive or negative charges of molecules due to their balance of protons and electrons. Oppositely charged particles attract and particles with the same charge repel one another. When atoms become cations or anions (positively or negatively charged, respectively), they exert these forces upon one another even within their molecules. When these forces become strong enough to affect them, the electrons in an atom may “delocalize” and become part of an extended energy field.

Chromophores are actually molecular regions or spaces created when two electron fields have an energy difference which falls into the visible light spectrum. As a light wave interacts with molecular fields, the energy differences and charges will correspond to with the wavelengths of light and elevate electrons from their ground state to an “excited” state, thus absorbing the energy of those wavelengths of light. The waves that do NOT resonate and are NOT absorbed and then reflected by the chromophore, creating the color we see.


Citations:

https://www.britannica.com/science/chromophore

https://www2.chemistry.msu.edu/faculty/reusch/virttxtjml/spectrpy/uv-vis/spectrum.htm

http://www.innovateus.net/science/what-chromophore





Also in PupilBlog

How Long is Too Long?
How Long is Too Long?

November 17, 2017

The risks of Digital Eye Strain, also known as Computer Visions Syndrome, come with “over-use” or “over-exposure” to Blue Light. But what truly is over-exposure? How much screen time is too much screen time?

Continue Reading

Why Does Blink Rate Slow During Computer Use
Why Does Blink Rate Slow During Computer Use

November 10, 2017

Digital Eye Strain (DES)  isn’t just caused by Blue Light. We wish it was, because then our glasses could totally solve the problem! Unfortunately, there are numerous factors that make your eyes tired and your productivity plummet by causing DES. One of the contributors can be the reduced blink rate which occurs during screen use. We know that blink rate can decrease by as much as a factor of 5 during screen use, but why?

Continue Reading

Two Creeping Health Dangers in the Office
Two Creeping Health Dangers in the Office

November 03, 2017

If we missed the dangers of smoking and asbestos before, what we are missing now? Here are some health risks that are just now becoming suspicious, and surround something many of us do: working on a computer.

Continue Reading