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Ultraviolet photodesorption as a driver of water migration on the lunar surface

机译：紫外线光解吸作为月球表面水迁移的驱动力

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摘要

We have studied the photodesorption of monolayer coverage of water ice coating amorphous carbon by 193 nm photons. We found that the column density of water decreases exponentially with fluence during irradiation at 120 K and obtain a desorption cross-section of (7.4 ±0.5) × 10~(-19)cm~2. We estimate the lifetime for photodesorption to be ～14 h for average solar activity at the sub-solar point on the Moon. The photodesorbed molecules, based on other experiments, are expected to be slower than the escape velocity and to be re-adsorbed on the surface, contributing to water migration. For comparison, we determine the effect of 4 keV He~+ on water-coated Apollo 16 soil (65901) under similar experimental conditions. We find a sputtering cross-section of (1.2 ±0.4) × 10~(-16)cm~2. We calculate that photodesorption by solar UV is four orders of magnitude more effective than sputtering by the solar wind in causing migration of adsorbed water on the lunar surface.
机译：我们已经研究了由193 nm光子对水冰覆盖无定形碳进行单层覆盖的光解吸。我们发现，在120 K辐照下，水的柱密度随着通量的增加而呈指数下降，并且解吸截面为（7.4±0.5）×10〜（-19）cm〜2。我们估计在月球下太阳点的平均太阳活动的光解吸寿命约为〜14 h。根据其他实验，预计光解吸的分子比逃逸速度要慢，并且会重新吸附在表面，从而导致水迁移。为了进行比较，我们在相似的实验条件下确定了4 keV He〜+对水覆盖的Apollo 16土壤（65901）的影响。我们发现溅射截面为（1.2±0.4）×10〜（-16）cm〜2。我们计算出，太阳紫外线在引起月球表面上的吸附水迁移方面比太阳风的溅射有效四个数量级。

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  • 来源
    《Planetary and space science》 |2013年第12期|42-46|共5页
  • 作者

    E.H. Mitchell; U. Raut; D. Fulvio; M.J. Schaible; C.A. Dukes; R.A. Baragiola;

  • 作者单位

    Laboratory for Atomic and Surface Physics, University of Virginia, Charlottesville, VA 22904, USA;

    Laboratory for Atomic and Surface Physics, University of Virginia, Charlottesville, VA 22904, USA;

    Laboratory for Atomic and Surface Physics, University of Virginia, Charlottesville, VA 22904, USA;

    Laboratory for Atomic and Surface Physics, University of Virginia, Charlottesville, VA 22904, USA;

    Laboratory for Atomic and Surface Physics, University of Virginia, Charlottesville, VA 22904, USA;

    Laboratory for Atomic and Surface Physics, University of Virginia, Charlottesville, VA 22904, USA;

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  • 正文语种 eng
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  • 关键词

    Photo-stimulated desorption; Sputtering; Lunar water; Water migration;

    机译：光刺激解吸;溅射;月球水;水迁移;

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