We report infrared spectroscopic studies of H2 ortho-para (o/p) conversion in solid hydrogen doped with Cl-atoms at 2 K while the <$E roman {Cl~+~H} sub 2 (v~=~1)~symbol О~ roman {HCl~+~H}> infrared-induced chemical reaction is occurring. The Cl-atom doped hydrogen crystals are synthesized using 355 nm in situ photodissociation of Cl2 precursor molecules. For hydrogen solids with high ortho-H2 fractional concentrations (<$E X sub o ~=~0,55>), the o/p conversion kinetics is dominated by Cl-atom catalyzed conversion with a catalyzed conversion rate constant <$E K sub cc ~=~1,16(11)~roman min sup -1> and the process is rate-limited by ortho-H2 quantum diffusion. For hydrogen crystals with low ortho-H2 concentrations (Xo = 0,03), single-exponential decay of the ortho-H2 concentration with time is observed which is attributed to H-atom catalyzed o/p conversion by the H-atoms produced during the infrared-induced Cl + H2 reaction. The measured H-atom catalyzed o/p conversion kinetics indicates the H-atoms are mobile under these conditions in agreement with previous ESR measurements.

Індекс рубрикатора НБУВ: В368.33

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Шифр НБУВ: Ж14063 Пошук видання у каталогах НБУВ 

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