Infrared-absorption spectrum of the electron bubble in liquid helium.
Infrared-absorption spectrum of the electron bubble in liquid helium.
复制标题
液氦中电子泡的红外吸收光谱。
DOI：
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发表时间：
1992
期刊：
影响因子：
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通讯作者：
Adams
中科院分区：
文献类型：
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作者：
Grimes;Adams
用直接红外吸收法测量了液氦中电子气泡中电子从基态到第一激发态的跃迁能，在0到凝固压力范围内，温度在1.3K到4.2K之间，在1.3K时，1~0.227 eV的分裂在0~0.227 eV之间变化。在中等压力下，如果表面张力与压力无关，一个简单的球方势垒模型计算可以在几个百分点内与测量的裂解相吻合。这个模型，当扩展到允许涡度上捕获的气泡的膨胀和伸长以及快速漂移气泡的膨胀时，与在所有压力下观察到的转变能很好地吻合。测量到的线宽至少比计算值大2倍，这可能表明快速漂移的气泡被加热了。
The energy of the electronic transition from the ground state to the first excited state in the electron bubble in liquid helium has been measured by direct infrared absorption at pressures from zero to the solidification pressure and at temperatures from 1.3 to 4.2 K. At 1.3 K the 1{ital s}-1{ital p} splitting varies from 0.102 eV at {ital P}=0 to 0.227 eV at {ital P}=25 atm. At intermediate pressures a simple spherical-square-well model calculation fits the measured splittings within a few percent if the surface tension is taken to be independent of pressure. This model, when extended to allow for dilation and elongation of bubbles trapped on vorticity and dilation of rapidly drifting bubbles, agrees well with the observed transition energies at all pressures. The measured linewidths are larger by at least a factor of 2 than those calculated, which may indicate heating of rapidly drifting bubbles.