Abstract
The magnetic susceptibility ( χ) of O 2, in a slit-shaped graphitic nanospace of pore width w=0.9 nm, was measured as a function of the fractional filling ( φ) by O 2 and the ratio R w of coexistent H 2O to O 2 in the temperature range 2 to 100 K. The effect of coexistent H 2O on the χ of the bulk O 2 was examined for comparison. The H 2O destroyed the antiferromagnetic ordering of the α-phase of the bulk solid O 2 inducing paramagnetism. O 2 in the nanospace at low φ showed the paramagnetism and coexistent H 2O of R w ≤0.35 accelerated the spin cluster formation. The presence of excess H 2O enhanced the paramagnetism of the confined O 2 due to the perfect isolation of an O 2 spin by clathrate formation.
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