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Determination of sticking probability by negative surface ionization mass spectrometry

1983; Elsevier BV; Volume: 47; Linguagem: Inglês

10.1016/0020-7381(83)87185-x

1873-3034

Hiroyuki Kawano, Tetsuro GODA, Hiromichi TAKEICHI, Tsutomu Kenpō, Yukikazu Kaino, Yoshiaki Hidaka,

Analytical chemistry methods development

A new technique based on our previous theoretical studies of dissociative negative surface ionization was developed to determine the sticking probability (σ) of a molecule including an electronegative element or radical, and examined with hydrogen chloride molecules incident upon a glowing polycrystalline tungsten surface. The emission currents of ions (Cl−) and electrons were measured simultaneously as a function of surface temperature (T = 1800 – 2100 K) or sample gas pressure (P = 0.6 – 20 microtorr). Experimental results thus obtained indicate that σ is virtually independent of P but changes in the range 0.02 – 0.05 depending upon T. Namely, σ = 16 exp[-24/RT], in kcal, mol, and K units.