Salama F, Allamandola L J, Sandford S A, Bregman J D, Witteborn F C, Cruikshank D P
NASA-Ames Research Center, Space Science Division, Moffett Field, California 94035-1000, USA.
Icarus. 1994;107:413-7. doi: 10.1006/icar.1994.1033.
A strong absorption band at 3590 +/- 20 cm-1 (2.790 +/- 0.015 micrometers) has been discovered in the spectrum of Io using the Kuiper Airborne Observatory (KAO). The 2 nu1 + nu3 combination mode of solid SO2 falls at this position. Since SO2 is abundant on Io it must contribute to the new band. However, a band due to H2O was predicted near this frequency in Io's spectrum based on laboratory experiments of H2O:SO2 mixed Io ice analogs which were used to assign the two weak, variable features of 3370 and 3170 cm-1 (2.97 and 3.15 micrometers) to trace amounts of H2O frozen in solid SO2 on Io. The new band probably originates from both SO2 and H2O. Unfortunately, the spectral resolution of the data is insufficient to settle the issue of whether there are two resolvable components.
利用柯伊伯机载天文台（KAO）在木卫一的光谱中发现了一个位于3590±20厘米⁻¹（2.790±0.015微米）的强吸收带。固态二氧化硫的2ν₁ + ν₃组合模式就处于这个位置。由于木卫一上二氧化硫含量丰富，它必定对这个新波段有贡献。然而，基于水与二氧化硫混合的木卫一冰类似物的实验室实验，在木卫一的光谱中该频率附近预测有一个由水产生的波段，这些实验被用于将3370和3170厘米⁻¹（2.97和3.15微米）处的两个微弱、可变特征归因为木卫一固态二氧化硫中冻结的微量水。这个新波段可能源于二氧化硫和水两者。不幸的是，数据的光谱分辨率不足以解决是否存在两个可分辨成分的问题。
