表明这一迹象的是撞击掀起的尘土中显示的红外线光谱中的一些谱线，其频率与水分子能量激发时所发出光线的频率相应。
The telltales are specific "lines" in the spectrum of infra-red light from the plume. These correspond to the frequencies of light given off when water molecules are energetically excited.
在可见光范围给出了所观察到的各条谱线的发射截面及相应上能级的激发截面。
The emission cross sections of the observed lines and the excitation cross sections of the corresponding states are obtained in the visible region.
为解释谱线强度增强的机理，测量了等离子体的激发温度。
The excitation temperature of laser plasma was measured to explain the mechanism that the line intensities increase.
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