The title is misleading. They don't get an X-ray image of the atom , like the X-ray of a person where you can see the bones and look if one of them is broken. So you can' get a "photo" of the atom with this method.
I think they don't even collect the X-rays after they hit the atom.
IIUC they use x-rays of different energies to light an atom, and use a tunnel microscope probe to collect electricity. Each different energy of the x-ays produce a different amount of electricity in the tunnel microscope. They get an spectrum, like the one near the bottom of the article, that can be used to identify the atom, but not to take a "photo".
I think they don't even collect the X-rays after they hit the atom.
IIUC they use x-rays of different energies to light an atom, and use a tunnel microscope probe to collect electricity. Each different energy of the x-ays produce a different amount of electricity in the tunnel microscope. They get an spectrum, like the one near the bottom of the article, that can be used to identify the atom, but not to take a "photo".