Photoionization Stuides of AsH₃ Using Synchrotron Radiation

The photoioniozation and photodissociative ionization of AsH₃ have been investigated under the supersonic beam conditions by using 50～200nm one photon synchrotron radiation and TOF mass spectroscopy techniques.The photoionization efficiency (PIE) curves of all the observed ions from AsH₃ molecule are measured and the adiabatic ionization potential (IP) of AsH₃⁺ and the appearance potentials (AP) of AsH₂⁺ and AsH⁺ from AsH₃ were accurately determined,i.e.9.93±0.02eV,12.59±0.04eV and 11.32±0.02eV,respectively.On these basis some therochemical data,such as he standad formation enthalpies (Δ_fH₀⁰) of the related ions,the bond energies (D₀) of the related molecules,radicals or their ions and the proton affinities (PA₀) of the related redicals,have been derived.Most of these data are reported for the first time.In addition,the most possible VUV one photon photoioniztion and photodissociative ionization channels of AsH₃ are analyzed.