Phys. Rev. Lett. 78, 2016–2019 (1997)Dipole Active Vibrational Motion in the Physisorption WellReceived 31 October 1996; published in the issue dated 10 March 1997 We demonstrate by electron energy-loss measurements that the vibrational motion in the physisorption well is dipole active. This is a general phenomenon and data for adsorbed H2, D2, and HD reveal a strong nonlinear dependence of the induced dipole moments on displacement. We find that a good estimate of the dipole moment function can be obtained from a van der Waals model. © 1997 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.78.2016
DOI:
10.1103/PhysRevLett.78.2016
PACS:
82.65.Pa, 33.20.Ea, 67.70.+n, 68.45.Kg
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