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1.
We report the discovery of the forbidden electronic a1Δ→X3Σ− transition of the SO radical on Io at 1.7 μm with the W. M. Keck II telescope on 24 September 1999 (UT), while the satellite was eclipsed by Jupiter. The shape of the SO emission band suggests a rotational temperature of ∼1000 K; i.e., the gas is extremely hot. We interpret the observed emission rate of ∼2×1027 photons s−1 to be caused by SO molecules in the excited a1Δ state being directly ejected from the vent at a thermodynamic quenching temperature of ∼1500 K, assuming a SO/SO2 abundance ratio of ∼0.1 and a total venting rate of ∼1031 molecules s−1 (Strobel and Wolven 2001, Astrophys. Space Sci. 277, 1-17). The shape of our complete (1.6-2.5 μm) spectrum suggests that the volcano Loki contains a small (∼2 km2) hot spot at 960±12 K, as well as a larger (∼50 km2) area at 640±5 K. 相似文献
2.
Laboratory transmission IR spectra of relatively thick films (up to 500 m) of mixed H2O and SO2 ices were measured at several temperatures between 10 and 130 K in the range 5000-450 cm–1. In addition to the strong features due to crystalline SO2 the spectra reveal bands at 3668 cm–1, 3634 cm–1 (with some structure) and 3300 cm–1 which are identified with H2O in SO2 environment. Also, there is no overlap between any of the H2O bands with the 3584 cm–1 band of SO2 at any temperature in the above range. The implication of this result is that H2O, if present on Io, must be far less than 1 part in 105 SO2. 相似文献