Page "Mercury cadmium telluride" Paragraph 5

At 80 K, the electron mobility of Hg < sub > 0. 8 </ sub > Cd < sub > 0. 2 </ sub > Te can be several hundred thousand cm < sup > 2 </ sup >/( V · s ).

Electrons also have a long ballistic length at this temperature ; their mean free path can be several micrometres.