A surprisingly large isotope effect is observed in nonthermal uv photodesorption of ammonia from GaAs(100). The cross section for NH₃ photodesorption is 4 times larger than for ND₃, a fact which cannot be explained using existing photodesorption models, e.g., the conventional Menzel-Gomer-Redhead model. We take this as the first evidence for uv-driven photodesorption from electronically quenched, vibrationally excited ground-state adsorbates.
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Zhu et al. (1992) studied this question.
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