Abstract
Ortho-para conversion of ${\mathrm{H}}_{2}$ and para-ortho conversion of ${\mathrm{D}}_{2}$ on an Ag surface were investigated by resonance-enhanced multiphoton ionization combined with photostimulated desorption. The conversion processes were found to be accelerated by laser irradiation at $193\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$, while photo-irradiation at $532\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ had little effect on the conversion time. The natural conversion time of ${\mathrm{H}}_{2}$ and ${\mathrm{D}}_{2}$ was estimated to be 610 and $1030\phantom{\rule{0.3em}{0ex}}\mathrm{s}$, respectively. The roles of electron transfer and rotational-energy dissipation in the conversion are discussed.
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