个人简介

B.S., 1979, North Carolina State University Ph.D., 1984, North Carolina State University Postdoctoral Fellow, 1985–1986, Lawrence Livermore National Laboratory Lawrence Livermore National Laboratory, Physics and Advanced Technologies Directorate Award, 2006; Georgia Southern State University, student seminar program featured research, 2006; Editorial Board Member of International Journal of Spectroscopy; A-Page Advisory Panel Member for Analytical Chemistry; Advisory board of TALANTA; International Scientific Committee Member NASLIBS, 2007;Tour Speaker for Society of Applied Spectroscopy (SAS), 2007; USC Educational Foundation Research Award for Science, Mathematics and Engineering, 2009; Elected Fellow AAAS, 2011; FACSS Innovation Award, 2011; Mortar Board Excellence in Teaching award, 2011; SCIX Innovation Award Winner 2011; ACS South Carolina Chemist of the Year, 2012; SAS Meggers Award, 2012; Carolina Trustee Professorship award, 2013; Invited Tour Speaker for the Society for Applied Spectroscopy, 2014.

研究领域

Analytical

Development of in situ characterization techniques including fiber-optic chemical sensors and remote spectroscopy including Raman, LIBS and REMPI. Of particular interest is applying optical spectroscopy to remote measurements in extreme environments and development of fieldable spectroscopic instrumentation. We are exploring a number of remote spectroscopic techniques and sensors for non-contact and in-situ measurements. Such techniques allow unique applications in environmental, marine, earth and space science. For example, in past research, microimaging sensors were used for in-situ measurements of analyte diffusion in thin membranes and in other work resonance enhanced multiphoton laser ionization, REMPI, was used to measure ppb levels of toxic compounds in soil samples. In more recent work, laser-induced breakdown spectroscopy, LIBS, is used for remote, noncontact elemental analysis and is being applied to in-situ chemical measurements in the deep ocean (see figure below). Other techniques being explored include standoff Raman spectroscopy and Raman imaging for planetary and homeland security applications. In LIBS, the sample is ablated and ionized using a pulsed laser. Analysis of the emission from the plasma provides information on the elemental composition of the sample. This technique is unique in that elemental composition can be determined remotely. Fiber-optics are used for many in-situ measurements. In this case, light transmitted to the sample region via the fiber optic is used to perform a direct spectroscopic measurement. This type of analysis is referred to as remote fiber spectroscopy (RFS) and encompasses many spectroscopic methods, such as Raman, surface- enhanced Raman, absorption, reflectance, LIBS, REMPI, and fluorescence spectroscopies that have been adapted for use with optical fibers. We are also interested in the use of optical fibers as chemical sensors where the transmitted light probes an intermediate material affixed to the terminal end of the fiber that interacts with a target molecule to produce an optical signal. Recently our focus has been on deep-ocean applications of LIBS, and standoff Raman spectroscopy for measuring hazardous materials and for planetary applications. LIBS is difficult in bulk aqueous solution because the laser-induced plasma is rapidly quenched by water. The quenching problem can be overcome by using laser pulse pairs, where a water bubble created by the first laser pulse isolates the LIBS plasma that is formed by the second laser pulse and trapped in the bubble. It is hoped that this technique will allow LIBS to be used for elemental analysis of hydrothermal vent fluids at 2–3 km depths. Homeland defense applications of standoff Raman spectroscopy include detection of high explosive materials at many 10s of meters distance. Our recent investigations of standoff Raman spectroscopy for planetary applications has led to the development of a new type of Fourier transform Raman spectrometer, the spatial heterodyne Raman spectrometer, that could lead to much smaller and more rugged Raman instruments suitable for planetary lander missions. This work also led to the first published description of an orbital Raman spectrometer suitable for surface Raman measurements.

近期论文

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Lawrence-Snyder, M.; Scaffidi, J. P.; Pearman, W. F.; Gordon, C. M.; Angel, S. M. ""Issues in Deep Ocean Collinear Double-Pulse Laser Induced Breakdown Spectroscopy: Dependence of Emission Intensity and Laser Inter-Pulse Delay on Solution Pressure."" Spectrochimica Acta Part B: Atomic Spectroscopy. (2014): 172-178. Register, J.; Scaffidi, J.; Angel, S. M.; “Direct Measurements of Sample Heating by a Laser-induced Air Plasma in Pre-Ablation Spark Dual-Pulse Laser-Induced Breakdown Spectroscopy (LIBS),” Appl. Spectrosc., (2012): 66, 869-874. Angel, S. M.; Sharma, S. K.; Gomer, N. R.; and McKay, Chris; “Remote Raman Spectroscopy for Planetary Exploration: A Review,” Appl. Spectrosc., feature article, Appl. Spectrosc. (2012): 66, 137-150. Gomer, N. R.; Gordon, C. M.; Lucey, P.; Sharma, S. K.; Carter, J. C.; Angel, S. M.; “Raman Spectroscopy Using a Spatial Heterodyne Spectrometer: Proof of Concept,” Appl. Spectrosc., (2011): 65, 849-857. Scaffidi, J.; Gregas, M. K.; Lauly, B.; Carter, J. C.; Angel, S. M.; Vo-Dinh, T.; “Stand-off SERS and SERRS detection in the presence of ambient light,” Appl. Spectrosc., (2010): 64(5), 485-492. Lawrence-Snyder, M.; Scaffidi, J.; Pearman, W. F.; and Michael, S. A, “Dependence of Emission Intensity and Laser Inter-Pulse Delay on Solution Pressure in Dual-Pulse Laser-Induced Breakdown Spectroscopy of Bulk Aqueous Solutions,” Appl. Spectrosc., accepted pending approval of final revisions, Jan. (2010). Vann, B. L.; Angel, S. M.; Morgan, S. L.; Hendrix, J. E.; Bartick, E. G.;“Analysis of Titanium Dioxide in Synthetic Fibers using Raman Microspectroscopy”, Applied Spectroscopy, (2009): 63, 23-27. Pearman, W. F.; Carter, J. C.; Angel, S. M.; Chan, J. W-J.; ""Quantitative measurements of CO2 and CH4 using a multipass Raman capillary cell,”Appl. Opt., (2008): 47, 4627-4632. Pearman, W. F.; Michael, S. A.; Ferry, J. F.; Sherwood, H.; “Characterization of the Ag Mediated Surface-Enhanced Raman Spectroscopy of Saxitoxin,” Appl. Spectrosc., (2008): 62, 727-732.. Pearman, W. F.; Carter, J.C.; Angel, S. M.; Chan, J. W-J. “Multipass Capillary Cell for Enhanced Raman Measurements of Gases,” Appl. Spectrosc., (2008): 62, 285-289. Michel, P. M. A; Lawrence-Snyder, M.; Angel, S. M.; Chave, A. D., “Laser- induced breakdown spectroscopy of bulk aqueous solutions at oceanic pressures: evaluation of key measurement parameters,” Appl. Opt., (2007): 46, 2507-2515. Pearman, W. F.; Lawrence-Snyder, M.; Angel, S. M.; and Decho, A.W.; “Surface-Enhanced Raman Spectroscopy for in Situ Measurements of Signaling Molecules (Autoinducers) Relevant to Bacteria Quorum Sensing,” Appl. Spectrosc., (2007): 61, 1295-1300.