We measured the velocity V_step of isolated elementary spiral steps and the distance L_eq between adjacent equivalent spiral steps on ice basal faces by advanced optical microscopy. We determined the step kinetic coefficient β from V_step measured under various supersaturations. We performed similar experiments under various temperatures T, and determined the temperature dependence of β of ice basal faces, for the first time, in the temperature range of −26.0 to −2.7 °C. When −6.2 ≤ T ≤ −2.7 °C, the value of β decreased significantly with decreasing T. In contrast, when −15.0 ≤ T ≤ −6.2 °C, the value of β increased with decreasing T, and had the maximum at T ≈ −15 °C. When −26.0 ≤ T ≤ −15.0 °C, the value of β decreased monotonically with decreasing T. Such complicated temperature dependence of β strongly implies the existence of unknown phenomena in the temperature range examined. To obtain a clue to the complicated behavior of β, we also measured dependence of L_eq on surface supersaturation Δμ^surf. When −13.0 ≤ T ≤ −3.2 °C, plots of L_eq vs 1/Δμ^surf satisfactorily follow the spiral growth model. However, when −26.0 ≤ T ≤ −15.0 °C, the L_eq vs 1/Δμ^surf plots do not follow any model: this temperature range agrees with the temperature range in which β decreased monotonically with decreasing T.

中文翻译：

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水蒸气生长的冰基面上基本螺旋台阶生长动力学的温度依赖性

我们测量了速度V_步骤的分离的基本螺旋形的步骤和距离大号_当量通过先进光学显微镜在冰上基底面相邻的等效螺旋步骤之间。我们从在各种过饱和条件下测得的V_阶跃确定了阶跃动力学系数β 。我们在各种温度T下进行了类似的实验，并首次确定了冰基面β在-26.0至-2.7°C的温度范围内的温度依赖性。当-6.2≤T≤ - 2.7°C时，β值随着T的降低而显着降低。相反，当-15.0≤ Ť≤-6.2℃，β的值随增加Ť，并有最大在Ť ≈-15℃。当-26.0≤T≤ - 15.0°C时，β值随着T的降低而单调降低。β的这种复杂的温度依赖性强烈暗示在所检查的温度范围内存在未知现象。为了获得线索β的复杂行为，我们还测量的依赖大号_当量上表面过饱和Δμ^冲浪。当-13.0≤ Ť ≤-3.2℃，的曲线大号_当量对1 / Δμ^冲浪令人满意地跟随螺旋生长模型。但是，当-26.0≤时Ť ≤-15.0℃时，大号_当量对1 / Δμ^冲浪曲线不按照任何模型：该温度范围内与温度范围中β随单调减少同意Ť。