Line strength and collisional broadening studies of hydrogen sulphide in the 1.58 µm region using diode laser spectroscopy
Line strength and collisional broadening studies of hydrogen sulphide in the 1.58 µm region using diode laser spectroscopy
复制标题
使用二极管激光光谱法研究 1.58 µm 区域硫化氢的线强度和碰撞展宽
DOI：
10.1007/s00340-008-3119-y
复制
发表时间：
2008
期刊：
影响因子：
--
通讯作者：
Ciaffoni L
中科院分区：
文献类型：
--
作者：
Ciaffoni L
利用ν-1+ν-2+ν-3和2-ν-1+ν-2在1.58μm附近的不同跃迁，利用高分辨率半导体激光光谱技术，探测到了ppm量级的硫化氢，确定了该光谱区域的合适谱线，并通过单程吸收光谱确定了绝对吸收截面，并用腔增强吸收光谱在多普勒线宽范围内进行了确认。对于可能适用于大气压下的硫化氢传感的灵敏系统的需求，导致了利用波长调制光谱(WMS)对合适的跃迁进行研究。建立灵敏度计算为1.73×10−8 cm−1s1/2，在1576.29 nm处探测到最强的谱线，在大气条件下最小可检测浓度为700ppb。此外，还测量了各种缓冲气体的压力展宽系数，并将其与控制碰撞过程的分子间势进行了关联，估计了H_2S-H_2S二聚体的势垒深度为7.06±0.09kJ −_1。
High resolution diode laser spectroscopy has been applied to the detection of hydrogen sulphide at ppm levels utilizing different transitions within the region of theν1+ν2+ν3and 2ν1+ν2combination bands around 1.58 μm. Suitable lines in this spectral region have been identified, and absolute absorption cross sections have been determined through single-pass absorption spectroscopy and confirmed in the Doppler linewidth regime using cavity enhanced absorption spectroscopy (CEAS). The desire for a sensitive system potentially applicable to H2S sensing at atmospheric pressure has led to an investigation on suitable transitions using wavelength modulation spectroscopy (WMS). The set-up sensitivity has been calculated as 1.73×10−8cm−1s1/2, and probing the strongest line at 1576.29 nm a minimum detectable concentration of 700 ppb under atmospheric conditions has been achieved. Furthermore, pressure broadening coefficients for a variety of buffer gasses have been measured and correlated to the intermolecular potentials governing the collision process; the H2S–H2S dimer well depth is estimated to be 7.06±0.09 kJ mol−1.