In particular, the photoionization edges are strongly broadened by the thermal motion of atoms; this "magnetic broadening" exceeds the usual Doppler broadening by orders of magnitude. The decentered states of the atoms give rise to the low-energy component of the photoionization cross section. This new component grows significantly with increasing temperature above 10~5.5 K and decreasing density below 1 g cm~-3, i.e., for the conditions expected in atmospheres of middle-aged neutron stars.
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机译：尤其是，光电离边缘会由于原子的热运动而大大加宽。这种“磁性展宽”比通常的多普勒展宽超出了几个数量级。原子的偏心态引起光电离截面的低能成分。这种新成分随着温度升高到10〜5.5 K以上而显着增长，而密度降低到1 g cm〜-3以下，即在中年中子星大气中预期的条件下。
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