They start the same way: a molecule absorbs light, and an electron gets excited to a higher energy level.

A molecule sitting in free space and not near anything that might disturb it will absorb a narrow range of colors.

If your molecule doesn't absorb near either of those two, you are out of luck.

These molecules also absorb light most efficiently in the 400 - 500 nm range.

When the ring is closed, the molecule absorbs all visible light except for the color of the bubble.

Only certain molecules can absorb light in this region.

Atoms and molecules absorb certain colors of light, and this can tell us a lot about them.

The important thing to remember is that certain molecules can only absorb certain energies.

A molecule or an atom absorbs at a certain wavelength.

The laser operates continuously, and can measure alcohol because molecules absorb light.