In full spectrum photography, Kikuchi artifacts can appear as hexagonal patterns resulting from interference and diffraction of light. These artifacts are typically caused by physical obstructions or irregularities in the optical system, such as dust particles or imperfections in lenses.
If a nano-sized particle is suspended in the air and happens to be in the path of the light entering the camera lens, it can indeed cause a larger hexagonal-shaped Kikuchi artifact in the resulting photograph. The interaction of light with the particle can lead to diffraction and scattering effects that manifest as patterns in the image.
However, the shape of the artifact itself does not directly provide specific information about the nature of the original particle. The shape of the artifact is primarily determined by the geometric properties of the obstructions or imperfections in the optical system and the interference patterns created. The exact shape and characteristics of the artifact can vary depending on the size, shape, and position of the particle, as well as the properties of the light and the optical system.
To obtain more information about the nature of the original particle from the artifact, additional analysis techniques, such as microscopy or spectroscopy, would typically be required. These techniques can help identify and characterize the composition, size, and morphology of the particle more accurately.