LIBS Analysis of Forensic Trace Evidence
摘要
Forensic science is a tool of the enforcement of laws and regulations, improving public safety and helping to solve cases for policemen. This field covers document examination, engineering, linguistics, pathology, DNA analysis, fingerprinting, electronic/digital media, anthropology, entomology, toxicology, economics, accounting, serology, chemistry, odontology, geology, botany, psychiatry, and behavioral science, physics, biometrics, bloodstain pattern identification, tool mark identification, hair and fiber analysis, as well as firearms identification. Because forensic science has the above mentioned important tasks and has to deal with irreplaceable evidence, forensic scientists use cutting-edge analytical methods and evaluation techniques. Among these, a relatively new technique, laser-induced breakdown spectroscopy (LIBS) begins to gain ground, which has a unique set of analytical characteristics advantageous in this field. For example, any samples, regardless of their consistency, can be measured quickly, in situ. The method is microdestructive and requires less than a μg sample mass, with minimal sample preparation. The small dimensions of the laser induced plasma allow the execution of spatially resolved measurements and it provides highly characteristic, “fingerprint-like” spectra. This chapter gives an overview of the present status of LIBS in forensic science.