Technical note: Bimodality in mesospheric OH rotational population distributions and implications for temperature measurements
Technical note: Bimodality in mesospheric OH rotational population distributions and implications for temperature measurements
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技术说明：中层 OH 旋转种群分布的双峰性及其对温度测量的影响
DOI：
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发表时间：
2018
影响因子：
6.3
通讯作者：
K. Kalogerakis
中科院分区：
文献类型：
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作者：
K. Kalogerakis
抽象的。来自OH Meinel带的发射通常用于确定旋转
温度被认为是动力学温度附近的代理
中层顶区先前的观测确定了OH旋转温度
显示出随着温度的升高，
总的来说，随着OH振动量子数v的增加。的来源
这一趋势尚未得到很好的理解，通常被归因于
偏离热力学平衡。本技术说明说明
双峰OH旋转布居分布的存在是一个
气体中旋转弛豫的固有特征，并且可以提供
解释先前报告的温度趋势。仅使用
涉及低转动量子的转动跃迁的几条谱线
确定旋转温度的数字并不能解释
双峰的OH旋转人口分布，并导致
高估OH旋转温度的系统误差。本说明
介绍了选定的例子，讨论了相关的影响，
考虑可能导致更可靠的OH旋转的策略
温度测定
Abstract. Emissions from the OH Meinel bands are routinely used to determine rotational
temperatures that are considered proxies for the kinetic temperature near the
mesopause region. Previous observations determined OH rotational temperatures
that show a dependence on the vibrational level, with the temperature rising
overall as the OH vibrational quantum number v increases. The source of
this trend is not well understood and has generally been attributed to
deviations from thermodynamic equilibrium. This technical note demonstrates
that the existence of bimodal OH rotational population distributions is an
inherent feature of rotational relaxation in gases and can provide an
explanation for the previously reported temperature trend. The use of only a
few lines from rotational transitions involving low rotational quantum
numbers to determine rotational temperatures does not account for the
bimodality of the OH rotational population distributions and leads to
systematic errors overestimating the OH rotational temperature. This note
presents selected examples, discusses the relevant implications, and
considers strategies that could lead to more reliable OH rotational
temperature determination.