Recombination of atomic hydrogen in a gas filled cell where the walls are covered with metal evaporated from either tungsten or tantalum filaments has been studied. The high internal energy (vibration) of the product H2molecule indicates that recombination occurs via a new mechanism. This mechanism involves the initial trapping of the H atoms in very weakly bound or physisorbed state on the top of the usual layer of strongly bound or chemisorbed layer of atoms which cover most metals when in presence of hydrogen.