LIBS

We investigate the effect of an applied electric field on the laser-induced titanium plasma for laser induced breakdown spectroscopy (LIBS) for the purpose of assessing electron density with respect to laser energy.

Great interest has recently aroused in the study of the dysregulation of chemical elements within tissues. Information about the distribution of elements in biological tissues can contribute to a more complete medical diagnosis, and can guide therapeutic procedures for many pathologies.

The unique strengths of LIBS-sample preparation optional, stand-off detection, portability, speed, and sensitive light element detection-point to future directions and potential for LIBS as a tool for soil measurements in precision agriculture.

LIBS-based imaging has a broad range of applications. Here, we demonstrate those capabilities with examples from paleoclimate research and toxicology studies.

Spectroscopy can be difficult to carry out outside a controlled laboratory environment. Imagine, then, the hurdles that would accompany performing spectroscopy in the extreme conditions of deep space or the ocean floor. Mike Angel, a professor of chemistry at the University of South Carolina, has taken on those challenges, working on new types of instruments for remote and in- situ laser spectroscopy, with a focus on deep-ocean, planetary, and homeland security applications of deep ultraviolet Raman, and laser-induced breakdown spectroscopy to develop the tools necessary to work within these extreme environments.

LIBS has transitioned from a method found only in research laboratories, to a technique in wide use in commercial settings. Several leading LIBS experts share their views on how the technique has developed and where it is heading.

The SuperCam remote sensing instrument suite under development for NASA’s Mars 2020 rover performs laser-induced breakdown spectroscopy (LIBS), remote Raman spectroscopy, visible and infrared (VISIR) reflectance spectroscopy, acoustic sensing, and high resolution color imaging. The instrument builds on the successful architecture of the ChemCam instrument which provides LIBS and panchromatic images on the Curiosity rover, adding the remote Raman spectroscopy by frequency doubling the laser and using a gated intensified detector to obtain Raman signals at distances to 12 m. To the visible reflectance spectroscopy used by ChemCam, an AOTF-based infrared spectrometer is added to cover the 1.3-2.6 µm range that contains important mineral signatures. A CMOS detector provides color (Bayer filter) images at a pixel resolution of 19 µrad and an optical resolution of 30 µrad. Sounds are recorded via a Knowles Electret microphone, which is the same one that was unsuccessfully attempted on two earlier missions. The acoustic signals of the LIBS plasmas will provide information on the hardness of the targets, while other sounds (wind, rover sounds) will also be recorded. The laser, telescope, IR spectrometer, and camera reside on the rover’s mast and are provided by CNES, while the LIBS, Raman, and VIS spectrometers and data processing unit are built by LANL and reside in the rover body. A calibration target assembly provided by U. Valladolid, Spain, resides on the back of the rover. The overall mass of the instrument suite is 10.7 kg.

The winner of Spectroscopy's inaugural Emerging Leader in Atomic Spectroscopy Award is highlighted.

Miniaturization of analytical instruments of various forms of spectroscopy has improved dramatically in recent years mainly because of the requirements in certain areas such as space, industrial, and environmental research. Research into miniaturization is primarily driven by the need to reduce the instrumental space and costs by reducing the consumption of expensive reagents and by increasing throughput and automation. Like other fields, analytical systems have also been affected by novel ideas and unprecedented advances in the microelectronics leading to miniaturization of different components in recent years. This article presents an overview of the current developments in the miniaturization of analytical instruments for mainly detecting metals at extremely low concentration levels, with some important examples from areas such as space, mineral exploration, the environment, and pharmaceuticals, focusing primarily on advancements as well as the challenges that have impacted from some of the major international manufacturers.

Pages 22–35 Rapid detection of coal and fly ash is significant to improve the efficiency of thermal power plants and reduce environmental pollution. Given its fast response, high sensitivity, real-time, and noncontact features, laser-induced breakdown spectroscopy (LIBS) has a great potential for on-line measurement in these applications. The direct measurement of particles and gases using LIBS was studied, and the method was shown to be effective for this application. 

For an emergent analytical technique to be adopted, its proponents must find applications where it offers significant benefits over established techniques, such as sensitivity, speed, cost, or ease of use, or some combination of those. For laser-induced breakdown spectroscopy (LIBS), identifying its ideal niche has been one of the challenges in gaining followers. To assess where LIBS is being used today, what new areas are emerging, and how well LIBS competes with other methods in those new areas, we asked a panel of experts for their views.

In honor of Spectroscopy’s celebration of 30 years covering the latest developments in materials analysis, we asked experts to assess the current state of the art of six key spectroscopic techniques. Here, the experts weigh in on the key challenges in laser-induced breakdown spectroscopy (LIBS), and how these problems might be solved.

In honor of Spectroscopy's celebration of 30 years covering the latest developments in materials analysis, we asked a panel of experts to assess the current state of the art of laser-induced breakdown spectroscopy (LIBS), and to try to predict how technology will develop in the future.

Nanostructured materials are expected to lead to the emergence of new products with enhanced functionalities. Their manufacture often requires the use of particles referred to as nano-objects, their aggregates, and their agglomerates. Laser-induced breakdown spectroscopy (LIBS) was deemed as a potential candidate for the detection of these materials in various contexts. This article discusses examples of the application of LIBS for workplace surveillance and process control of nano-objects.

This article explores the use of laser-induced breakdown spectroscopy (LIBS) for measurements of elemental concentrations and bulk properties of heterogeneous, earthen-based samples. Rapid field and industrial measurements of these matrices are difficult using traditional methods.

Dr. Richard R. Hark, a professor in the Department of Chemistry at Juniata College in Huntingdon, Pennsylvania, discusses his work using LIBS for emergency response to hazardous materials. Adam L. Miller, the director at the Huntingdon County Emergency Management Agency in Pennsylvania, also talks about his work as a first responder and how he has been involved in Hark's research.

Users must be careful when developing material classification and calibration methods for LIBS. By following some guidelines, one can achieve relative standard deviation values of 2–3% for many types of analysis, and below 1% for homogenous samples.

NASA's Curiosity rover landed inside the 3.7-billion-year-old Gale Crater on Mars on August 6, 2012, and it has been obtaining data about the planet?s rocks and soils with its ChemCam instrument ever since. We recently spoke with Roger Wiens of the Los Alamos National Laboratory, the Principal Investigator of the ChemCam instrument, about the instrument's laser-induced breakdown spectroscopy (LIBS) capabilities.

Dr. Richard R. Hark, a professor in the Department of Chemistry at Juniata College in Huntingdon, Pennsylvania, discusses his work with LIBS in applications such as forensic science, conflict minerals, and geochemical fingerprinting.

The choices for LIBS hardware are discussed in detail, particularly lasers and spectrometers, and the trade-offs between cost, size, and performance are illustrated.

Dustin McIntyre, of the National Energy Technology Laboratory, US Department of Energy in Morgantown, West Virginia, has been exploring the use of laser-induced breakdown spectroscopy (LIBS) to measure subsurface gases, liquids, and solids at subsurface conditions.

An overview for those considering implementation of LIBS to solve a particular analytical problem, and an introduction for those interested in learning more about LIBS. Part I concentrates on the basics of the measurement and typical implementation.

Part of a new podcast series presented in collaboration with the Federation of Analytical Chemistry and Spectroscopy Societies (FACSS), in connection with SciX 2012 — the Great Scientific Exchange, the North American conference (39th Annual) of FACSS.