Trapped atoms are always illuminated by a laser that picks out one single wavelength emitted by the atom. This isn’t necessarily the same color you’d see if these atoms were scattering sunlight—in addition to the color used in the lab, you might see a few other wavelengths as well, along with a generic bluish color due to Rayleigh scattering. But since each atom emits / absorbs different wavelengths, each will look different both under sunlight and when trapped in the lab.
Trapped atoms are always illuminated by a laser that picks out one single wavelength emitted by the atom. This isn’t necessarily the same color you’d see if these atoms were scattering sunlight—in addition to the color used in the lab, you might see a few other wavelengths as well, along with a generic bluish color due to Rayleigh scattering. But since each atom emits / absorbs different wavelengths, each will look different both under sunlight and when trapped in the lab.
Here’s an example of trapped atoms emitting green light—figure 3 is a photo taken through an optical microscope: https://arxiv.org/ftp/arxiv/papers/0908/0908.0174.pdf