astronomyblog:At the very centre of the image above is something incredible - a single, positively-c
astronomyblog:At the very centre of the image above is something incredible - a single, positively-charged strontium atom, suspended in motion by electric fields.Not only is this an incredibly rare sight, it’s also difficult to wrap your head around the fact that this tiny point of blue light is a building block of matter.The image was captured by physicist David Nadlinger from the University of Oxford, and it’s been awarded the overall prize in the UK’s Engineering and Physical Sciences Research Council photo competition.To give you a little perspective on the size of this set-up, the atom is being held in place by electric fields emanating from those two metal needles on either side of it.The distance between them is about 2 millimetres (0.08 inch).The atom is being illuminated by a blue-violet laser. The energy from the laser causes the atom to emit photons which Nadlinger could capture on camera using a long exposure.The whole thing is housed inside an ultra-high vacuum chamber and dramatically cooled to keep the atom still. Nadlinger took this photo through the window of the vacuum chamber.To learn more, click here. -- source link