Yang Clayton S C, Bower Dina M, Jin Feng, Hewagama Tilak, Aslam Shahid, Nixon Conor A, Kolasinski John, Samuels Alan C
Brimrose Corporation of America, Sparks-Glencoe, MD, USA.
University of Maryland, College Park, MD, USA.
MethodsX. 2022 Feb 26;9:101647. doi: 10.1016/j.mex.2022.101647. eCollection 2022.
Laser Induced Breakdown Spectroscopy (LIBS) in the Ultra Violet/Visible/Near-IR (UVN) spectral range is a powerful analytical tool that facilitates the interpretation of Raman spectroscopic data by providing additional details in elemental chemistry. To acquire the complete information of molecular vibrations for more accurate and precise chemical bonding and structural analysis, an ideal optical sensing facility should be able to rapidly probe the broad vibrational dipole and polarizability responses of molecules by acquiring both Raman scattering and mid-IR emission spectroscopic signatures. Recently, the research team at Brimrose has developed a novel optical technology, Long-Wave IR (LWIR) LIBS. Critical experimental approaches were made to capture the infrared molecular emission signatures from vibrationally excited intact samples excited by laser-induced plasma in a LIBS event. LWIR LIBS is the only fieldable mid-IR emission spectroscopic technique to-date that that offers the same instrumental and analytical advantages of both UVN LIBS and Raman spectroscopy in in-situ stand-off field applications and can perform rapid and comprehensive molecular structure analysis without any sample-preparation.•A single excitation laser pulse is used to trigger both UVN and LWIR spectrometers simultaneously.•Time-resolved UVN-LWIR LIBS measurements showed the evolution of both atomic and molecular signature emissions of target compounds in the laser-induced plasma.•The technique was applied to the characterization of mineral and organic compounds in planetary analog samples.
紫外/可见/近红外（UVN）光谱范围内的激光诱导击穿光谱（LIBS）是一种强大的分析工具，通过提供元素化学方面的更多细节，有助于对拉曼光谱数据进行解释。为了获取分子振动的完整信息，以进行更准确和精确的化学键合及结构分析，理想的光学传感设备应能够通过获取拉曼散射和中红外发射光谱特征，快速探测分子的广泛振动偶极矩和极化率响应。最近，Brimrose的研究团队开发了一种新型光学技术，即长波红外（LWIR）LIBS。采用了关键的实验方法，以捕捉在LIBS事件中由激光诱导等离子体激发的完整振动样品的红外分子发射特征。LWIR LIBS是迄今为止唯一可现场使用的中红外发射光谱技术，在现场远距离应用中具有UVN LIBS和拉曼光谱的相同仪器和分析优势，并且无需任何样品制备即可进行快速全面的分子结构分析。
• 使用单个激发激光脉冲同时触发UVN和LWIR光谱仪。
• 时间分辨UVN-LWIR LIBS测量显示了激光诱导等离子体中目标化合物的原子和分子特征发射的演变。
• 该技术被应用于行星模拟样品中矿物和有机化合物的表征。
