Cavity enhanced absorption spectroscopy measurements of pressure-induced broadening and shift coefficients in the ? 1+? 3 combination band of ammonia
Cavity enhanced absorption spectroscopy measurements of pressure-induced broadening and shift coefficients in the ? 1+? 3 combination band of ammonia
复制标题
腔增强吸收光谱测量压力引起的展宽和位移系数？
DOI：
10.1007/s00340-008-3238-5
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
Bell C
中科院分区：
文献类型：
--
作者：
Bell C
腔增强吸收光谱使用工作在1516 nm附近的外腔二极管激光器进行。我们证明了灵敏度为6 × 10 - 8 cm-1Hz-1/2，并利用一种简单的方法来测量压力引起的展宽和移位系数。在室温下测定了六种气体（氦、氖、氩、氙、氧和氮）氨的NH3 + NH 4 + NH3结合带的四个跃迁的展宽和位移系数。加宽系数与以前的工作在这个区域，它存在的比较，显示出良好的协议。氮和氧的展宽和位移系数也与用Robert和Bonamy理论计算的值符合得很好。通过稀有气体，加宽和移位系数都显示出明显的趋势，这可以用碰撞伙伴之间作用的长程吸引力的变化幅度来解释。我们还展示了应用Parmenter-Seaver形式主义估计氨二聚体的潜在深度从所获得的加宽系数。所得井深与理论计算值吻合较好。
Cavity enhanced absorption spectroscopy is performed using an external cavity diode laser operating around 1516ánm. We demonstrate a sensitivity of 6Î10−8ácm−1Hz−1/2and utilise a simple method to measure pressure-induced broadening and shift coefficients. The broadening and shift coefficients for six gases (helium, neon, argon, xenon, oxygen and nitrogen) have been determined at room temperature for four transitions in theυ1+υ3combination band of ammonia. Comparisons of the broadening coefficients with previous work in this region, where it exists, show good agreement. The broadening and shift coefficients of nitrogen and oxygen are also in good agreement with calculated values using the Robert and Bonamy theory. Both the broadening and shift coefficients show a clear trend through the rare gases, which can be explained in terms of the varying magnitude of the long range attractive forces operating between the colliding partners. We also demonstrate the application of the Parmenter–Seaver formalism to estimate the potential well depth of the ammonia dimer from the obtained broadening coefficients. The obtained well depth agrees well with theoretical calculations.