Molecular-scale images taken by a scanning, tunneling microscope showed these to be palygroskite and indigo.
The scientists placed the single phosphorus atom using a device known as a scanning tunneling microscope.
Then a technician showed them how graphite was cleaned before being observed in a scanning tunneling microscope by peeling layers off with Scotch tape.
That group has taken an approach based on placing individual atoms using a scanning tunneling microscope, allowing great precision in building devices on an atomic scale.
The prototype itself only existed in an extremely low-temperature environment and data had to be written with a scanning tunneling microscope.
A team of I.B.M. researchers at the company's Almaden Research Center in San Jose, Calif., were able to use a scanning tunneling microscope to observe the magnetic orientation of iron and manganese atoms at low temperatures.
Crossing a barrier that once seemed impassable, physicists in recent years have used a delicate instrument called a scanning tunneling microscope to reach down into the very substrate of matter, feeling the bumps and grooves of atoms and even picking them up and moving them around like so many grains of sand.
The researchers can, through a burst of an electric field from a tip of a scanning tunneling microscope, deliberately flip one switch at a time, shifting the molecule to the "on" position, where it carries current between the microscope tip and the gold surface.
The researchers now use a scanning tunneling microscope, which looks like a giant washing machine festooned with aluminum foil, not only to capture images of atoms but to reposition individual atoms — much the way a billiard ball might be moved by a pool cue with a sticky tip.
In another development concerning imaging techniques, Ruslan Temirov and colleagues at the Jülich Research Centre in Germany reported that the attachment of a hydrogen or deuterium molecule to the probe tip of a scanning tunneling microscope could greatly enhance the microscope's resolution of complex organic molecules.
In 1981 Binnig and Rohrer built what they called a "scanning tunneling microscope".
