Abstract
We provide the first direct demonstration of the three-dimensional vibrational motion of hydrogen monoatomically chemisorbed at the bridge sites on a well defined W(001) surface in β 1 phase, by the Doppler broadening in the narrow resonance of the 1H( 15H, αγ) 12C ( E res = 6.385 MeV) reaction. The beam-incident angle (θ) dependence of the Doppler width shows that the mean square of momentum 〈 p〉 of vibrating hydrogen on the surface takes the maximum at θ = 15°. We propose a possible model that the bridge plane leans away from the axis perpendicular to the surface due to the interaction between the hydrogen atoms opposite to each other.
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