Electron and cation transport in gaseous carbon dioxide: Density and temperature effects
Electron and cation transport in gaseous carbon dioxide: Density and temperature effects
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气态二氧化碳中的电子和阳离子传输：密度和温度影响
DOI：
10.1063/1.450222
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发表时间：
1986
影响因子：
4.4
通讯作者：
G. Freeman
中科院分区：
文献类型：
--
作者：
F. Jacobsen;G. Freeman
在低密度CO2气体中，电子的密度归一化迁移率为nμe =1.88×1024分子/m V s，与温度无关。它比具有类似分子大小和各向异性极化性的碳氢化合物乙烯中的值低一个数量级。二氧化碳分子对热电子的散射可能涉及到一种短暂的阴离子状态。在密度为n>5×1025分子/m3的蒸汽/液体共存曲线上，电子附着在分子团簇上，e−+(CO2)q，其中q 6。在共存蒸汽中，当n>14×1025分子/m3时，负电荷和正电荷具有相同的迁移率，因此电子是永久附着的。当气体以恒定密度加热时，会发生电子分离；加热降低了平均簇大小，并为分离提供了活化能。在密度≥30×1025分子/m3的恒定条件下，通过改变t可使nμe的值改变1000倍。在n=31和56（1025分子/m3）时，准自由电子的nμe的值改变了1000倍。
In low density CO2 gas, the density normalized mobility of electrons is nμe =1.88×1024 molecule/m V s, independent of temperature. It is an order of magnitude lower than the value in ethene, a hydrocarbon of similar molecular size and anisotropic polarizability. Scattering of thermal electrons by carbon dioxide molecules might involve a transient anion state. At densities n>5×1025 molecule/m3 along the vapor/liquid coexistence curve, electron attachment to molecular clusters occurs, e−+(CO2)q⇄(CO2)−q, where q≊6. At n>14×1025 molecule/m3 in the coexistence vapor the negative and positive charges have the same mobility, so the electrons are permanently attached. Electron detachment can occur when the gas is heated at constant density; heating decreases the average cluster size and provides activation energy for detachment. At a constant density ≥30×1025 molecule/m3 the value of nμe can be changed 1000‐fold by changing T. At n=31 and 56 (1025 molecule/m3) the values of nμe for quasifree (unattached) electron...