spectroscopy comes of age
It is possible
to learn a lot about a sample by exciting
it with a pulsed laser and using a very fast
detector to measure the resulting emissions
and decay as a function of time. Ultrafast
lasers and pulse-shaping techniques have
helped open up new applications.
Bottling the hydrogen
hydrogen is to replace gasoline for road
transport, a means to store useful quantities
of hydrogen on-board the vehicle must be
found. Storage as a liquid, as a gas, or
in metal hydrides all have serious limitations.
carbon nanotube identification
new method has been found to identify and
classify various structural forms of carbon
nanotubes, each with its characteristic electronic
properties, in a typical mixture, using spectrofluorimetry
intermetallic, electrically conducting compound---ytterbium-gallium-germanium---exhibits
near-zero thermal expansion because, when
cooled, the crystal cell stretches in one
direction and contracts in another, maintaining
the same volume.