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首页> 外文期刊>The Astrophysical journal >ACTIVATION OF THE 3.47 μm BAND BY H ATOM IRRADIATION OF CARBON GRAINS COVERED WITH A WATER ICE LAYER AT 12 K
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ACTIVATION OF THE 3.47 μm BAND BY H ATOM IRRADIATION OF CARBON GRAINS COVERED WITH A WATER ICE LAYER AT 12 K

机译：在12 K的水冰层上碳原子热辐照活化3.47μm谱带

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摘要

We present the first results of laboratory research on the processing of nano-sized carbon particles under simulated dense-medium conditions. The experiments aim to study the variations of the degree of hydrogenation of carbon particles covered with a water ice layer in response to H atom exposure. The effects of H atom processing have been studied by means of IR spectroscopy. The results show that the formation of C-H bonds in the aliphatic CH_2 and CH_3 functional groups does not take place. The activation of a band at 3.47 μm is observed. It is assigned to the C-H stretching vibration of tertiary sp~3 carbon atoms. The band profile is compatible with that present in the spectrum of sources embedded in dense clouds. We propose that the carbon grain population, which is responsible for the interstellar aliphatic 3.4 μm band in diffuse regions, absorbs at 3.47 μm in dense clouds.
机译：我们介绍了在模拟的重介质条件下处理纳米级碳粒子的实验室研究的第一项结果。该实验旨在研究响应于H原子暴露而被水冰层覆盖的碳颗粒的氢化程度变化。已经通过红外光谱研究了H原子处理的效果。结果表明，在脂肪族CH_2和CH_3官能团中没有形成C-H键。观察到在3.47μm处的谱带激活。它被归因于叔sp〜3个碳原子的C-H拉伸振动。频带轮廓与密集云中嵌入的源频谱中的频带轮廓兼容。我们建议碳粒种群负责弥散区中星际脂肪3.4μm带，在稠密云中吸收3.47μm。

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  • 来源
    《The Astrophysical journal》 |2008年第2期|p.101-104|共4页
  • 作者

    Vito Mennella;

  • 作者单位

    Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Capodimonte, Via Moiariello 16, 80131 Naples, Italy;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 天文学;
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