Magnetic Faraday modulation spectroscopy of the 1-0 band of 14NO and 15NO
Magnetic Faraday modulation spectroscopy of the 1-0 band of 14NO and 15NO
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DOI：
10.1007/s00340-008-3223-z
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发表时间：
2008-11-01
影响因子：
2.1
通讯作者：
Muertz, M.
中科院分区：
文献类型：
--
作者：
Fritsch, T.;Horstjann, M.;Muertz, M.
观察到了5 μ m附近一氧化氮（NO）基本带的磁旋转光谱信号，并与计算信号进行了比较。这种光谱方法利用磁场调制的法拉第配置非常灵敏的检测NO。线的形状和强度的法拉第信号取决于分子参数，如J和Delta量子数的过渡所涉及的，和实验参数，如气体样品的压力和施加的外部磁场强度。在这项研究中，我们实现了一个软件模型，它提供了一个完整的v=1-0法拉第光谱NO的模拟。该算法考虑了磁场调制，碰撞和多普勒展宽的线的形状，和14 NO和15 NO的基本带线的线强度。最佳值的压力和磁场调制的最大灵敏度。讨论了同时探测14 NO和5 NO的合适光谱窗口。用CO边带激光器和量子级联激光器在1840 - 1900 cm-1的波数范围内获得了实验数据。计算值和观测值之间的比较显示出良好的协议。
Magnetic rotation spectroscopy signals of the nitric oxide (NO) fundamental band near 5 mu m have been observed and compared with calculated signals. This spectroscopic approach exploits magnetic field modulation in the Faraday configuration for very sensitive detection of NO. Line shapes and strengths of the Faraday signals depend on molecular parameters, like J and Delta quantum numbers of the transitions involved, and on experimental parameters, like pressure of the gas sample and applied external magnetic field strength. In this study we implemented a software model which provides a simulation of the complete v=1-0 Faraday spectrum of NO. The algorithm considers the magnetic field modulation, the collisional and Doppler broadening of the line shapes, and the line intensities of 14NO and 15NO fundamental band lines. Optimum values for pressure and magnetic field modulation for maximum sensitivity are given. Suitable spectral windows for simultaneous detection of 14NO and 5NO are discussed. Experimental data were obtained in the wavenumber region from 1840 to 1900 cm-1supercript stop by means of a CO sideband laser and a quantum cascade laser. Comparison between calculated and observed signals shows excellent agreement.